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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

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Mots-clés : astronomie, astrophysique, étoiles, spectroscopie, variabilité

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

To cite this 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 : https://popups.uliege.be:443/0037-9565/index.php?id=7587.

About: Patricia Lampens

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium

About: Yves Frémat

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium

About: Lore Vermeylen

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium

About: Peter De Cat

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium

About: Louis Dumortier

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium

About: Ádám Sódor

Konkoly Observatory, MTA CSFK, Konkoly Thege M. u. 15-17, H-1121 Budapest, Hungary

About: Marek Skarka

Konkoly Observatory, MTA CSFK, Konkoly Thege M. u. 15-17, H-1121 Budapest, Hungary

About: Zsófia Bognár

Konkoly Observatory, MTA CSFK, Konkoly Thege M. u. 15-17, H-1121 Budapest, Hungary