Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..107w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 1, April 1991, p. 107-110. FRFC-supported research.
Astronomy and Astrophysics
Astrophysics
1
Astronomical Photometry, Early Stars, Light Curve, Stellar Magnitude, Variable Stars, B Stars, Binary Stars, Stellar Models, Stellar Rotation
Scientific paper
The southern Be star is a photometric variable with a rather large amplitude of more than 0.8 magnitude in the visual. From 176 photometric data in the Geneva System that cover six years, it is demonstrated that the star is a biperiodic variable. The two periods are 8.929 and 2.824 days; mean light curves with these periods account for 44 percent and 22 percent of the variance, respectively. Colors and magnitudes vary in phase with respect to the first frequency, but not so with respect to the second frequency. Although multiperiodic variables tend to be pulsating stars, any pulsation model meets with serious difficulties here, since periods and amplitudes are unusually large. HD 137518 may be a mass-transfering binary system in which the gainer is spun up. Observations of other kinds are needed in order to specify the exact nature of this most unusual object.
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