Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..172f&link_type=abstract
Publications of the Astronomical Society of the Pacific, Vol. 94, P. 172, 1982
Astronomy and Astrophysics
Astronomy
37
Scientific paper
UBVRI photometry of R CrB near maximum light over several seasons is presented. Light fluctuations of about or are confirmed, but the light curve is very irregular in shape, amplitude, and length. A quasi- or characteristic period of 46 ± 5 days is found.
Combined with a theoretical mass of 0.8 ± 0.2 Msun and a variety of period-radius-mass relations, this period yields a radius of 73 ± 9 rsun and log g = 0.61 ± 0.15. The BVRI color data suggest Teff 6500 ± 400K and EB-V = 0.00, which, with the above radius, indicate Mbol = -5.1 ± 0.4 or log L/Lsun = 3.93 ± 0.15.
Comparison with the theoretical work of Wood strongly suggests that the period observed is the fundamental radial mode, hut the theory finds that this mode should be cataclysmically unstable at about this temperature and that only higher modes, although producing irregular light curves, are possible. The observed light curve, often showing broad maxima and narrow sharp minima, is in qualitative agreement with the higher mode light curves found theoretically by Wood, but are strongly discrepant in amplitude (0.1 mag observed, 2 mag predicted). Similar discrepancies persist in the theoretical work of Trimble and of King. The additional discrepancy between theory and observation found by Alexander et al. for RY Sgr, viz. that the color curves lead the light curves in phase, is probably also present in R CrB.
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