Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-08
Astronomy and Astrophysics
Astrophysics
13 pages (+ 10 pages online material), 10 (+16) figures. Accepted for publication by A&A
Scientific paper
10.1051/0004-6361:20053655
We present results of a spectroscopic study of 37 southern (candidate) gamma Doradus stars based on echelle spectra. The observed spectra were cross-correlated with the standard template spectrum of an F0-type star for an easier detection of binary and intrinsic variations. We identified 15 objects as spectroscopic binaries, including 7 new ones, and another 3 objects are binary suspects. At least 12 objects show composite spectra. We could determine the orbital parameters for 9 binaries, of which 4 turn out to be ellipsoidal variables. For 6 binaries, we estimated the expected time-base of the orbital variations. Clear profile variations are observed for 17 objects, pointing towards stellar pulsation. For 8 of them, we have evidence that the main spectroscopic and photometric periods coincide. Our results, in combination with prior knowledge from the literature, lead to the classification of 10 objects as new bona-fide gamma Doradus stars, 1 object as new bona-fide delta Scuti star, and 8 objects as constant stars. Finally, we determined the projected rotational velocity with two independent methods. The resulting vsini values range from 3 to 135 km/s. For the bona-fide gamma Doradus stars, the majority has vsini below 60 km/s.
Aerts Christine
Cuypers Jan
de Cat Peter
Eyer Laurent
Groenewegen Martin
No associations
LandOfFree
A spectroscopic study of southern (candidate) gamma Doradus stars. I. Time series analysis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A spectroscopic study of southern (candidate) gamma Doradus stars. I. Time series analysis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A spectroscopic study of southern (candidate) gamma Doradus stars. I. Time series analysis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-293191