Spectroscopic monitoring of bright A-F type candidate hybrid stars discovered by the Kepler mission
Patricia Lampens,
Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Yves Frémat,
Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Lore Vermeylen,
Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Peter De Cat,
Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Louis Dumortier,
Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Ádám Sódor,
Konkoly Observatory, MTA CSFK, Konkoly Thege M. u. 15-17, H-1121 Budapest, Hungary
Marek Skarka,
Konkoly Observatory, MTA CSFK, Konkoly Thege M. u. 15-17, H-1121 Budapest, Hungary
Zsófia Bognár,
Konkoly Observatory, MTA CSFK, Konkoly Thege M. u. 15-17, H-1121 Budapest, Hungary
Abstract
We report on a study of 250 optical spectra for 50 bright A/F-type candidate hybrid pulsating stars from the Kepler field. Most of the spectra have been collected with the high-resolution spectrograph HERMES attached to the Mercator telescope, La Palma. We determined the radial velocities (RVs), projected rotational velocities, fundamental atmospheric parameters and provide a classification based on the appearance of the cross-correlation profiles and the behaviour of the RVs with time in order to find true hybrid pulsators. Additionally, we also detected new spectroscopic binary and multiple systems in our sample and determined the fraction of spectroscopic systems. In order to be able to extend this investigation to the fainter A-F type candidate hybrid stars, various high-quality spectra collected with 3–4 m sized telescopes suitably equipped with a high-resolution spectrograph and furthermore located in the Northern hemisphere would be ideal. This programme could be done using the new instruments installed at the Devasthal Observatory.
Keywords : astronomy, astrophysics, spectroscopy, stars, variability
Pour citer cet article
Patricia Lampens, Yves Frémat, Lore Vermeylen, Peter De Cat, Louis Dumortier, Ádám Sódor, Marek Skarka & Zsófia Bognár, «Spectroscopic monitoring of bright A-F type candidate hybrid stars discovered by the Kepler mission», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 137 - 144 URL : http://popups.ulg.be/0037-9565/index.php?id=7587.
