Multi-site, multi-technique survey of ? Doradus candidates: I. Spectroscopic results for 59 stars
- Autor(en)
- P Mathias, J M Le Contel, Eric Chapellier, Slobodan Jankov, Jean Pierre Sareyan, Ennio Poretti, Rafael Garrido, Eloy Rodriguez, A. Arellano Ferro, M Alvarez, L Parrao, J Pena, Laurent Eyer, Conny Aerts, Peter De Cat, Werner Wolfgang Weiss, A Zhou
- Abstrakt
We present the first results of a 2-year high-resolution spectroscopy campaign of 59 candidate ? Doradus stars which were mainly discovered from the HIPPARCOS astrometric mission. More than 60% of the stars present line profile variations which can be interpreted as due to pulsation related to ? Doradus stars. For all stars we also derived the projected rotation velocity (up to more than 200 km s-1). The amplitude ratios 2K/dm for the main HIPPARCOS frequency are in the range 35-96 km s -1 mag-1. About 50% of the candidates are possible members of binary systems, with 20 stars being confirmed ? Doradus. At least 6 stars present composite spectra, and in all but one case (for which only one spectrum could be obtained), the narrow component shows line profile variations, pointing towards an uncomfortable situation if this narrow component originates from a shell surrounding the star. This paper is the first of a series concerning mode identification using both photometric and spectroscopic methods for the confirmed ? Doradus stars of the present sample.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Université Côte d'Azur, INAF Osservatorio Astronomico di Brera, Instituto de Astrofísica de Andalucía, Universidad Nacional Autonoma de Mexico, Observatorio Astronomico Nacional (IA-UNAM), Universität Genf, Katholieke Universiteit Leuven, Chinese Academy of Sciences (CAS)
- Journal
- Astronomy & Astrophysics
- Band
- 417
- Seiten
- 189-199
- Anzahl der Seiten
- 11
- ISSN
- 0004-6361
- Publikationsdatum
- 2004
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/2fbf0234-5244-4dc7-b60e-26238416d0cc