Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-21
Astron.Astrophys. 335 (1998) 549-560
Astronomy and Astrophysics
Astrophysics
12 pages, latex with figures. Accepted by A&A
Scientific paper
We present new spectroscopic and photometric time series observations of the delta Scuti star FG~Vir. We detect the oscillations via changes in the equivalent widths of hydrogen and metal absorption lines. From the ratios between spectroscopic and photometric amplitudes, we assign l values to the eight strongest oscillation modes. In particular, we identify two radial modes (l =0) and find that the main pulsation mode (147 microHz) has l = 1. One of the radial modes (at 140 microHz) is the fundamental, implying that two modes with lower frequencies are g-modes. For the radial modes, we compare frequencies with those calculated from a scaled delta Scuti star model and derive a density 0.1645 +/- 0.0005 rho_sol. We then obtain a distance of 84 +/- 3 pc, in excellent agreement with the Hipparcos value. Finally, we suggest that a 3.5-day variability in all observables (equivalent widths and intensity) is caused by stellar rotation.
Baldry Ivan K.
Bedding Tim R.
Bruntt Hans
Dall Thomas H.
Frandsen Soeren
No associations
LandOfFree
Oscillation mode identifications and models for the delta Scuti star FG Virginis 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 Oscillation mode identifications and models for the delta Scuti star FG Virginis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oscillation mode identifications and models for the delta Scuti star FG Virginis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-473975