Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jrasc..89..245b&link_type=abstract
Journal of the Royal Astronomical Society of Canada, 89, 245-256 (1995)
Astronomy and Astrophysics
Astronomy
Scientific paper
HR Comae (HR 4684) is a low amplitude Delta Scuti type variable. An analysis by Papar=DB et al. (1993) of photometric observations obtained over five years from 1976 to 1989 identified four frequencies, of which only one (near 15 cycles day=961) was identified in each year. We observed the star on 11 nights in 1992 and four nights in 1993. A periodogram analysis of the light curves, divided into four subsets, yielded four frequencies which were present in at least two of the groups. A significant peak near 15.2 cycles day=961 was present in three of the groups with an amplitude of about 3 mmag in B; the same frequency (or an adjacent 1 cycle day=961 alias) dominates the Fourier spectrum of the entire data set. Although the same frequencies seem to recur, the amplitudes vary with time. A comparison with earlier frequency estimates would imply period changes over the two decade interval that are many orders of magnitude too large to be due to stellar evolution. Instead, we argue that different pulsation modes and/or rotationally-split side lobes have probably been observed at different epochs. The amplitude variations we observed are consistent with such mode growth and decay.
Bax J.
Sharpe Stephen
Wehlau William H.
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