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Arxiv.org

53 53

Investigating the properties of granulation in the red giants observed by Kepler

Sep 23, 2013 09/13

by S. Mathur; S. Hekker; R. Trampedach; J. Ballot; T. Kallinger; D. Buzasi; R. A. Garcia; D. Huber; A. Jimenez; B. Mosser; T. R. Bedding; Y. Elsworth; C. Regulo; D. Stello; W. J. Chaplin; J. De Ridder; S. J. Hale; K. Kinemuchi; H. Kjeldsen; F. Mullaly; S. E. Thompson

eye 53

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More than 1000 red giants have been observed by NASA/Kepler mission during a nearly continuous period of ~ 13 months. The resulting high-frequency resolution ( < 0.03 muHz) allows us to study the granulation parameters of these stars. The granulation pattern results from the convection motions leading to upward flows of hot plasma and downward flows of cooler plasma. We fitted Harvey-like functions to the power spectra, to retrieve the timescale and amplitude of granulation. We show that...
Source: http://arxiv.org/abs/1110.0117v1

Arxiv.org

57 57

Spin down of the core rotation in red giants

Sep 18, 2013 09/13

by B. Mosser; M. J. Goupil; K. Belkacem; J. P. Marques; P. G. Beck; S. Bloemen; J. De Ridder; C. Barban; S. Deheuvels; Y. Elsworth; S. Hekker; T. Kallinger; R. M. Ouazzani; M. Pinsonneault; R. Samadi; D. Stello; R. A. Garcia; T. C. Klaus; J. Li; S. Mathur; R. L. Morris

eye 57

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The space mission Kepler provides us with long and uninterrupted photometric time series of red giants. We are now able to probe the rotational behaviour in their deep interiors using the observations of mixed modes. We aim to measure the rotational splittings in red giants and to derive scaling relations for rotation related to seismic and fundamental stellar parameters. We have developed a dedicated method for automated measurements of the rotational splittings in a large number of red...
Source: http://arxiv.org/abs/1209.3336v1

Arxiv.org

55 55

Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters

Sep 19, 2013 09/13

by T. Kallinger; B. Mosser; S. Hekker; D. Huber; D. Stello; S. Mathur; S. Basu; T. R. Bedding; W. J. Chaplin; J. De Ridder; Y. P. Elsworth; S. Frandsen; R. A. Garcia; M. Gruberbauer; J. M. Matthews; W. J. Borucki; H. Bruntt; J. Christensen-Dalsgaard; R. L. Gilliland; H. Kjeldsen; D. G. Koch

eye 55

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Clear power excess in a frequency range typical for solar-type oscillations in red giants has been detected in more than 1000 stars, which have been observed during the first 138 days of the science operation of the NASA Kepler satellite. This sample includes stars in a wide mass and radius range with spectral types G and K, extending in luminosity from the bottom of the giant branch up to high-luminous red giants. The high-precision asteroseismic observations with Kepler provide a perfect...
Source: http://arxiv.org/abs/1010.4589v1

Arxiv.org

38 38

Long-term photometric monitoring with the Mercator telescope. Frequencies and multicolour amplitudes of $γ$ Doradus stars

Sep 23, 2013 09/13

by J. Cuypers; C. Aerts; P. De Cat; J. De Ridder; K. Goossens; C. Schoenaers; K. Uytterhoeven; B. Acke; G. Davignon; J. Debosscher; L. Decin; W. De Meester; P. Deroo; R. Drummond; K. Kolenberg; K. Lefever; G. Raskin; M. Reyniers; S. Saesen; B. Vandenbussche; R. Van Malderen; T. Verhoelst; H. Van Winckel; C. Waelkens

eye 38

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Gamma Doradus stars are excellent targets for asteroseismology since the gravity modes present in these stars probe the deep stellar interiors. Mode identification will improve the knowledge of these stars considerably. A selected group of Gamma Doradus stars and some candidates were observed with the Mercator telescope to find and/or confirm the periodicities in the light variations and to derive reliable amplitude ratios in different pass bands. A frequency analysis was performed on all new...
Source: http://arxiv.org/abs/0903.5213v1

Arxiv.org

75 75

Solar-like oscillations in red giants observed with Kepler: comparison of global oscillation parameters from different methods

Sep 21, 2013 09/13

by S. Hekker; Y. Elsworth; J. De Ridder; B. Mosser; R. A. Garcia; T. Kallinger; S. Mathur; D. Huber; D. L. Buzasi; H. L. Preston; S. J. Hale; J. Ballot; W. J. Chaplin; C. Regulo; T. R. Bedding; D. Stello; W. J. Borucki; D. G. Koch; J. Jenkins; C. Allen; R. L. Gilliland; H. Kjeldsen; J. Christensen-Dalsgaard

eye 75

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The large number of stars for which uninterrupted high-precision photometric timeseries data are being collected with \textit{Kepler} and CoRoT initiated the development of automated methods to analyse the stochastically excited oscillations in main-sequence, subgiant and red-giant stars. Aims: We investigate the differences in results for global oscillation parameters of G and K red-giant stars due to different methods and definitions. We also investigate uncertainties originating from the...
Source: http://arxiv.org/abs/1008.2959v1

Arxiv.org

63 63

Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars

Sep 19, 2013 09/13

by D. Huber; T. R. Bedding; D. Stello; B. Mosser; S. Mathur; T. Kallinger; S. Hekker; Y. P. Elsworth; D. L. Buzasi; J. De Ridder; R. L. Gilliland; H. Kjeldsen; W. J. Chaplin; R. A. Garcia; S. J. Hale; H. L. Preston; T. R. White; W. J. Borucki; J. Christensen-Dalsgaard; B. D. Clarke; J. M. Jenkins; D. Koch

eye 63

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We have studied solar-like oscillations in ~800 red-giant stars using Kepler long-cadence photometry. The sample includes stars ranging in evolution from the lower part of the red-giant branch to the Helium main sequence. We investigate the relation between the large frequency separation (Delta nu) and the frequency of maximum power (nu_max) and show that it is different for red giants than for main-sequence stars, which is consistent with evolutionary models and scaling relations. The...
Source: http://arxiv.org/abs/1010.4566v1

Arxiv.org

6 6.0

Gaia Data Release 1 - The Cepheid & RR Lyrae star pipeline and its application to the south ecliptic pole region

Jun 29, 2018 06/18

by G. Clementini; V. Ripepi; S. Leccia; N. Mowlavi; I. Lecoeur-Taibi; M. Marconi; L. Szabados; L. Eyer; L. P. Guy; L. Rimoldini; G. Jevardat de Fombelle; B. Holl; G. Busso; J. Charnas; J. Cuypers; F. De Angeli; J. De Ridder; J. Debosscher; D. W. Evans; P. Klagyivik; I. Musella; K. Nienartowicz; D. Ordonez; S. Regibo; M. Riello; L. M. Sarro; M. Suveges

eye 6

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We present an overview of the Specific Objects Study (SOS) pipeline developed within the Coordination Unit 7 (CU7) of the Gaia Data Processing and Analysis Consortium (DPAC), the coordination unit charged with the processing and analysis of variable sources observed by Gaia, to validate and fully characterise Cepheids and RR Lyrae stars observed by the spacecraft. We describe how the SOS for Cepheids and RR Lyrae stars (SOS Cep&RRL) was specifically tailored to analyse Gaia's G-band...
Topics: Astrophysics, Solar and Stellar Astrophysics, Astrophysics of Galaxies
Source: http://arxiv.org/abs/1609.04269

Arxiv.org

17 17

The 2003-4 multisite photometric campaign for the Beta Cephei and eclipsing star 16 (EN) Lacertae with an Appendix on 2 Andromedae, the variable comparison star

Jun 28, 2018 06/18

by M. Jerzykiewicz; G. Handler; J. Daszynska-Daszkiewicz; A. Pigulski; E. Poretti; E. Rodriguez; P. J. Amado; Z. Kolaczkowski; K. Uytterhoeven; T. N. Dorokhova; N. I. Dorokhov; D. Lorenz; D. Zsuffa; S. -L. Kim; P. -O. Bourge; B. Acke; J. De Ridder; T. Verhoelst; R. Drummond; A. I. Movchan; J. -A. Lee; M. Steslicki; J. Molenda-Zakowicz; R. Garrido; S. -H. Kim; G. Michalska; M. Paparo; V. Antoci; C. Aerts

eye 17

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A multisite photometric campaign for the Beta Cephei and eclipsing variable 16 Lacertae is reported. 749 h of high-quality differential photoelectric Stromgren, Johnson and Geneva time-series photometry were obtained with ten telescopes during 185 nights. After removing the pulsation contribution, an attempt was made to solve the resulting eclipse light curve by means of the computer program EBOP. Although a unique solution was not obtained, the range of solutions could be constrained by...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1508.05250

Arxiv.org

55 55

Asteroseismology of the Beta Cephei star 12 (DD) Lacertae: photometric observations, pulsational frequency analysis and mode identification

Sep 23, 2013 09/13

by G. Handler; M. Jerzykiewicz; E. Rodriguez; K. Uytterhoeven; P. J. Amado; T. N. Dorokhova; N. I. Dorokhov; E. Poretti; J. -P. Sareyan; L. Parrao; D. Lorenz; D. Zsuffa; R. Drummond; J. Daszynska-Daszkiewicz; T. Verhoelst; J. De Ridder; B. Acke; P. -O. Bourge; A. I. Movchan; R. Garrido; M. Paparo; T. Sahin; V. Antoci; S. N. Udovichenko; K. Csorba; R. Crowe; B. Berkey; S. Stewart; D. Terry; D. E. Mkrtichian; C. Aerts

eye 55

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We report a multisite photometric campaign for the Beta Cephei star 12 Lacertae. 750 hours of high-quality differential photoelectric Stromgren, Johnson and Geneva time-series photometry were obtained with 9 telescopes during 190 nights. Our frequency analysis results in the detection of 23 sinusoidal signals in the light curves. Eleven of those correspond to independent pulsation modes, and the remainder are combination frequencies. We find some slow aperiodic variability such as that...
Source: http://arxiv.org/abs/astro-ph/0510326v1

Arxiv.org

51 51

Discovery of a red giant with solar-like oscillations in an eclipsing binary system from Kepler space-based photometry

Sep 22, 2013 09/13

by S. Hekker; J. Debosscher; D. Huber; M. G. Hidas; J. De Ridder; C. Aerts; D. Stello; T. R. Bedding; R. L. Gilliland; J. Christensen-Dalsgaard; T. M. Brown; H. Kjeldsen; W. J. Borucki; D. Koch; J. M. Jenkins; H. Van Winckel; P. G. Beck; J. Blomme; J. Southworth; A. Pigulski; W. J. Chaplin; Y. P. Elsworth; I. R. Stevens; S. Dreizler; D. W. Kurtz; C. Maceroni; D. Cardini; A. Derekas; M. D. Suran

eye 51

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Oscillating stars in binary systems are among the most interesting stellar laboratories, as these can provide information on the stellar parameters and stellar internal structures. Here we present a red giant with solar-like oscillations in an eclipsing binary observed with the NASA Kepler satellite. We compute stellar parameters of the red giant from spectra and the asteroseismic mass and radius from the oscillations. Although only one eclipse has been observed so far, we can already determine...
Source: http://arxiv.org/abs/1001.0399v1

Arxiv.org

56 56

Testing Scaling Relations for Solar-Like Oscillations from the Main Sequence to Red Giants using Kepler Data

Sep 23, 2013 09/13

by D. Huber; T. R. Bedding; D. Stello; S. Hekker; S. Mathur; B. Mosser; G. A. Verner; A. Bonanno; D. L. Buzasi; T. L. Campante; Y. P. Elsworth; S. J. Hale; T. Kallinger; V. Silva Aguirre; W. J. Chaplin; J. De Ridder; R. A. Garcia; T. Appourchaux; S. Frandsen; G. Houdek; J. Molenda-Zakowicz; M. J. P. F. G. Monteiro; J. Christensen-Dalsgaard; R. L. Gilliland; S. D. Kawaler; H. Kjeldsen; A. M. Broomhall; E. Corsaro; D. Salabert; D. T. Sanderfer; S. E. Seader; J. C. Smith

eye 56

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We have analyzed solar-like oscillations in ~1700 stars observed by the Kepler Mission, spanning from the main-sequence to the red clump. Using evolutionary models, we test asteroseismic scaling relations for the frequency of maximum power (nu_max), the large frequency separation (Delta_nu) and oscillation amplitudes. We show that the difference of the Delta_nu-nu_max relation for unevolved and evolved stars can be explained by different distributions in effective temperature and stellar mass,...
Source: http://arxiv.org/abs/1109.3460v1

Arxiv.org

3 3.0

$Detection of solar-like oscillations in the bright red giant stars $\gamma$ Psc and $\theta^1$ Tau from a 190-day high-precision spectroscopic multisite campaign$

Detection of solar-like oscillations in the bright red giant stars $\gamma$ Psc and $\theta^1$ Tau from a 190-day high-precision spectroscopic multisite campaign

Jun 30, 2018 06/18

by P. G. Beck; E. Kambe; M. Hillen; E. Corsaro; H. Van Winckel; E. Moravveji; J. De Ridder; S. Bloemen; S. Saesen; P. Mathias; P. Degroote; T. Kallinger; T. Verhoelst; H. Ando; F. Carrier; B. Acke; R. Oreiro; A. Miglio; P. Eggenberger; B. Sato; K. Zwintz; P. I. Pápics; P. Marcos-Arenal; S. A. Sans Fuentes; V. S. Schmid; C. Waelkens; R. Østensen; J. M. Matthews; M. Yoshida; H. Izumiura; H. Koyano; S. Nagayama; Y. Shimizu; N. Okada; K. Okita; A. Sakamoto; T. Yamamuro; C. Aerts

eye 3

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Red giants are evolved stars which exhibit solar-like oscillations. Although a multitude of stars have been observed with space telescopes, only a handful of red-giant stars were targets of spectroscopic asteroseismic observing projects. We search for solar-like oscillations in the two bright red-giant stars $\gamma$ Psc and $\theta^1$ Tau from time series of ground-based spectroscopy and determine the frequency of the excess of oscillation power $\nu_{max}$ and the mean large frequency...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.6352

Arxiv.org

52 52

Kepler Asteroseismology Program: Introduction and First Results

Sep 22, 2013 09/13

by Ronald L. Gilliland; T. M. Brown; J. Christensen-Dalsgaard; H. Kjeldsen; C. Aerts; T. Appourchaux; S. Basu; T. R. Bedding; W. J. Chaplin; M. S. Cunha; P. De Cat; J. De Ridder; J. A. Guzik; G. Handler; S. Kawaler; L. Kiss; K. Kolenberg; D. W. Kurtz; T. S. Metcalfe; M. J. P. F. G. Monteiro; R. Szabó; T. Arentoft; L. Balona; J. Debosscher; Y. P. Elsworth; P. - O. Quirion; D. Stello; J. C. Suárez; W. J. Borucki; J. M. Jenkins; D. Koch; Y. Kondo; D. W. Latham; J. F. Rowe; J. H. Steffen

eye 52

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Asteroseismology involves probing the interiors of stars and quantifying their global properties, such as radius and age, through observationsof normal modes of oscillation. The technical requirements for conducting asteroseismology include ultra-high precision measured in photometry in parts per million, as well as nearly continuous time series over weeks to years, and cadences rapid enough to sample oscillations with periods as shortas a few minutes. We report on results from the first 43...
Source: http://arxiv.org/abs/1001.0139v1

Arxiv.org

81 81

Fundamental Properties of Stars using Asteroseismology from Kepler & CoRoT and Interferometry from the CHARA Array

Sep 22, 2013 09/13

by D. Huber; M. J. Ireland; T. R. Bedding; I. M. Brandão; L. Piau; V. Maestro; T. R. White; H. Bruntt; L. Casagrande; J. Molenda-Żakowicz; V. Silva Aguirre; S. G. Sousa; T. Barclay; C. J. Burke; W. J. Chaplin; J. Christensen-Dalsgaard; M. S. Cunha; J. De Ridder; C. D. Farrington; A. Frasca; R. A. García; R. L. Gilliland; P. J. Goldfinger; S. Hekker; S. D. Kawaler; H. Kjeldsen; H. A. McAlister; T. S. Metcalfe; A. Miglio; M. J. P. F. G. Monteiro; M. H. Pinsonneault; G. H. Schaefer; D. Stello; M....

eye 81

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We present results of a long-baseline interferometry campaign using the PAVO beam combiner at the CHARA Array to measure the angular sizes of five main-sequence stars, one subgiant and four red giant stars for which solar-like oscillations have been detected by either Kepler or CoRoT. By combining interferometric angular diameters, Hipparcos parallaxes, asteroseismic densities, bolometric fluxes and high-resolution spectroscopy we derive a full set of near model-independent fundamental...
Source: http://arxiv.org/abs/1210.0012v1

Arxiv.org

41 41

Solar-like oscillations in low-luminosity red giants: first results from Kepler

Sep 22, 2013 09/13

by T. R. Bedding; D. Huber; D. Stello; Y. P. Elsworth; S. Hekker; T. Kallinger; S. Mathur; B. Mosser; H. L. Preston; J. Ballot; C. Barban; A. M. Broomhall; D. L. Buzasi; W. J. Chaplin; R. A. Garcia; M. Gruberbauer; S. J. Hale; J. De Ridder; S. Frandsen; W. J. Borucki; T. Brown; J. Christensen-Dalsgaard; R. L. Gilliland; J. M. Jenkins; H. Kjeldsen; D. Koch; K. Belkacem; L. Bildsten; H. Bruntt; T. L. Campante; S. Deheuvels; A. Derekas; M. -A. Dupret; M. -J. Goupil; A. Hatzes; G. Houdek; M. J....

eye 41

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We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30-minute sampling, reveal clear oscillations in a large sample of G and K giants, extending in luminosity from the red clump down to the bottom of the giant branch. We confirm a strong correlation between the large separation of the oscillations (Delta nu) and the frequency of maximum power (nu_max). We focus on...
Source: http://arxiv.org/abs/1001.0229v2

Arxiv.org

6 6.0

Gaia Data Release 1: The variability processing & analysis and its application to the south ecliptic pole region

Jun 30, 2018 06/18

by L. Eyer; N. Mowlavi; D. W. Evans; K. Nienartowicz; D. Ordonez; B. Holl; I. Lecoeur-Taibi; M. Riello; G. Clementini; J. Cuypers; J. De Ridder; A. C. Lanzafame; L. M. Sarro; J. Charnas; L. P. Guy; G. Jevardat de Fombelle; L. Rimoldini; M. Süveges; F. Mignard; G. Busso; F. De Angeli; F. van Leeuwen; P. Dubath; M. Beck; J. J. Aguado; J. Debosscher; E. Distefano; J. Fuchs; P. Koubsky; T. Lebzelter; S. Leccia; M. Lopez; A. Moitinho; S. Regibo; V. Ripepi; M. Roelens; L. Szabados; B. Tingley; V....

eye 6

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The ESA Gaia mission provides a unique time-domain survey for more than one billion sources brighter than G=20.7 mag. Gaia offers the unprecedented opportunity to study variability phenomena in the Universe thanks to multi-epoch G-magnitude photometry in addition to astrometry, blue and red spectro-photometry, and spectroscopy. Within the Gaia Consortium, Coordination Unit 7 has the responsibility to detect variable objects, classify them, derive characteristic parameters for specific...
Topics: Solar and Stellar Astrophysics, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1702.03295

Arxiv.org

33 33

Towards ensemble asteroseismology of the young open clusters Chi Persei and NGC 6910

Sep 22, 2013 09/13

by S. Saesen; A. Pigulski; F. Carrier; G. Michalska; C. Aerts; J. De Ridder; M. Briquet; G. Handler; Z. Kolaczkowski; B. Acke; E. Bauwens; P. G. Beck; Y. Blom; J. Blommaert; E. Broeders; M. Cherix; G. Davignon; J. Debosscher; P. Degroote; L. Decin; S. Dehaes; W. De Meester; P. Deroo; M. Desmet; R. Drummond; J. R. Eggen; J. Fu; K. Gazeas; G. A. Gelven; C. Gielen; R. Huygen; X. Jiang; B. Kalomeni; S. -L. Kim; D. H. Kim; G. Kopacki; J. -H. Kwon; D. Ladjal; C. -U. Lee; Y. -J. Lee; K. Lefever; A....

eye 33

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As a result of the variability survey in Chi Persei and NGC6910, the number of Beta Cep stars that are members of these two open clusters is increased to twenty stars, nine in NGC6910 and eleven in Chi Persei. We compare pulsational properties, in particular the frequency spectra, of Beta Cep stars in both clusters and explain the differences in terms of the global parameters of the clusters. We also indicate that the more complicated pattern of the variability among B type stars in Chi Persei...
Source: http://arxiv.org/abs/1004.2853v1

Arxiv.org

11 11

Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects

Jun 30, 2018 06/18

by Gaia Collaboration; F. van Leeuwen; A. Vallenari; C. Jordi; L. Lindegren; U. Bastian; T. Prusti; J. H. J. de Bruijne; A. G. A. Brown; C. Babusiaux; C. A. L. Bailer-Jones; G. Jasniewicz; S. Jordan; M. Kontizas; A. J. Korn; A. C. Lanzafame; M. Manteiga; A. Moitinho; K. Muinonen; J. Osinde; E. Pancino; M. Biermann; T. Pauwels; J. -M. Petit; A. Recio-Blanco; A. C. Robin; L. M. Sarro; C. Siopis; M. Smith; K. W. Smith; A. Sozzetti; W. Thuillot; D. W. Evans; W. van Reeven; Y. Viala; U. Abbas; A. Abreu...

eye 11

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Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using Hipparcos and Tycho-2 positions in 1991.25 as prior information. Aims. We investigate the scientific potential and limitations of the TGAS component by means of the astrometric data for open clusters. Methods. Mean cluster parallax and proper motion values are...
Topics: Solar and Stellar Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1703.01131

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