Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Graham A. Verner"'
Autor:
Graham A. Verner, Rafael A. García, Jørgen Christensen-Dalsgaard, Travis S. Metcalfe, Savita Mathur, William J. Chaplin, V. Silva Aguirre, Jérôme Ballot, Sarbani Basu, Cunha, Mário J. P. F. G. Monteiro, Anwesh Mazumdar, D. Salabert, H. M. Antia, G. Houdek
Publikováno v:
Astronomische Nachrichten. 333:1040-1043
We report the measurement of the acoustic locations of layers of sharp variation in sound speed in the interiors of 19 solar-type stars observed by the Kepler mission. The oscillatory signal in the frequencies arising due to the acoustic glitches at
Autor:
J. Molenda-Zakowicz, Clara Régulo, T. Appourchaux, T. L. Campante, C. Catala, K. Uytterhoeven, D. T. Sanderfer, Robert L. Morris, Ian W. Roxburgh, Rasmus Handberg, H. Kjeldsen, Daniel Huber, H. Bruntt, A. O. Thygesen, Barry Smalley, S. Basu, T. R. Bedding, Yvonne Elsworth, Elisa V. Quintana, William J. Chaplin, B. Mosser, J.-C. Gazzano, D. Stello, P.-O. Quirion, R. A. Garcia, Graham A. Verner, J. Christensen-Dalsgaard, S. Mathur, T. S. Metcalfe, S. D. Kawaler, S. Hekker, Christoffer Karoff
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 423:122-131
We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that the overall metallicity is well-represented by Fe lines. Relative abun
Autor:
Rasmus Handberg, Savita Mathur, Jessie L. Christiansen, Dennis Stello, D. A. Caldwell, Enrico Corsaro, William J. Chaplin, Y. P. Elsworth, Tiago L. Campante, Christoffer Karoff, Thierry Appourchaux, Rafael A. García, David Salabert, Patrick Gaulme, Saskia Hekker, Ian W. Roxburgh, Timothy R. White, Daniel Huber, Graham A. Verner, Jérôme Ballot, Anne-Marie Broomhall, Roger New, Alfio Bonanno, Timothy R. Bedding, Michael N. Fanelli, C. Régulo, Benoit Mosser
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 415:3539-3551
We present the asteroseismic analysis of 1948 F-, G- and K-type main-sequence and subgiant stars observed by the NASA {\em Kepler Mission}. We detect and characterise solar-like oscillations in 642 of these stars. This represents the largest cohort o
Autor:
Patrick Gaulme, Ian W. Roxburgh, Clara Régulo, Patrick Boumier, Graham A. Verner, Thierry Appourchaux, Jérôme Ballot, Rafael A. García, Savita Mathur, Reza Samadi, Benoit Mosser, C. Catala, M. Auvergne, Eric Michel, Frédéric Baudin, William J. Chaplin, A. Baglin, C. Barban, Sébastien Deheuvels, Hans Bruntt, Yvonne Elsworth
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2009, 506, pp.51-56. ⟨10.1051/0004-6361/200911937⟩
Astronomy and Astrophysics-A&A, 2009, 506, pp.51-56. ⟨10.1051/0004-6361/200911937⟩
International audience; Context: The estimate of solar-like oscillation properties, such as their frequencies, amplitudes and lifetimes, is challenging because of their low amplitudes and will benefit from long and uninterrupted observing runs. The s
Autor:
John Leibacher, Graham A. Verner, S. J. Jiménez-Reyes, M. Lazrek, Stephen T. Fletcher, T. Appourchaux, J. Lochard, Roger New, Y. P. Elsworth, C. Régulo, R. Wachter, F. Baudin, William J. Chaplin, T. Toutain, Rafael A. García, David Salabert, Patrick Boumier
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 389:1780-1790
We report on the results of the latest solarFLAG hare-and-hounds exercise, which was concerned with testing methods for extraction of frequencies of low-degree solar p modes from data collected by Sun-as-a-star observations. We have used the new sola
Publikováno v:
Solar Physics. 251:189-196
Obtaining reliable estimates of linewidths in the power spectra of low-degree p modes is problematic at low frequency. In this regime, the mode coherence time increases with decreasing frequency, often causing the modes to be unresolved in relatively
Publikováno v:
The Astrophysical Journal. 659:1749-1760
We analyze thirty years of solar oscillations data collected by the Birmingham Solar Oscillations Network (BiSON). Estimates of the mean frequency shifts of low-degree p-modes have been extracted over a period spanning solar cycles 21-23. Two methods
Publikováno v:
The Astrophysical Journal. 640:L95-L98
We find evidence for an activity-dependent change in solar structure at the second helium ionization zone (~0.98 R☉). We use low-degree p-mode frequencies obtained from 13 years of observations by the Birmingham Solar Oscillations Network (BiSON) t
Publikováno v:
The Astrophysical Journal. 638:440-445
Regions of rapid variation in stellar interiors introduce characteristic periodic signatures into the frequencies of their p-mode oscillations. These signatures have previously been isolated in solar data and have been used to estimate the level of c
Publikováno v:
The Astrophysical Journal. 635:L105-L108
Roxburgh & Vorontsov have recently proposed the use of ratios of small to large frequency separations of low angular degree p-modes as a means of eliminating from asteroseismic data the unwanted influence of the structure of the near-surface layers o