Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-03
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures, 4 tables, accepted by Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20042480
Extensive photometric multisite campaigns of the Delta Scuti variable FG Vir are presented. For the years 2003 and 2004, 926 hours of photometry at the millimag precision level were obtained. The combinations with earlier campaigns lead to excellent frequency resolution and high signal/noise. A multifrequency analysis yields 79 frequencies. This represents a new record for this type of star. The modes discovered earlier were confirmed. Pulsation occurs over a wide frequency band from 5.7 to 44.3 c/d with amplitudes of 0.2 mmag or larger. Within this wide band the frequencies are not distributed at random, but tend to cluster in groups. A similar feature is seen in the power spectrum of the residuals after 79 frequencies are prewhitened. This indicates that many additional modes are excited. The interpretation is supported by a histogram of the photometric amplitudes, which shows an increase of modes with small amplitudes. The old question of the 'missing modes' may be answered now: the large number of detected frequencies as well as the large number of additional frequencies suggested by the power spectrum of the residuals con rms the theoretical prediction of a large number of excited modes. FG Vir shows a number of frequency combinations of the dominant mode at 12.7162 c/d (m = 0) with other modes of relatively high photometric amplitudes. The amplitudes of the frequency sums are higher than those of the differences. A second mode (20.2878 c/d) also shows combinations. This mode of azimuthal order m = -1 is coupled with two other modes of m = +1.
Antoci Victoria
Breger Michel
Costa Víctor
de Coca Lopez P.
Guggenberger Elisabeth
No associations
LandOfFree
Detection of 75+ pulsation frequencies in the Delta Scuti star FG Vir 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 Detection of 75+ pulsation frequencies in the Delta Scuti star FG Vir, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detection of 75+ pulsation frequencies in the Delta Scuti star FG Vir will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-176813