The unusual variability of the bright supergiant companion of the eclipsing binary BL Tel

Details The unusual variability of the bright supergiant companion of the eclipsing binary BL Tel The unusual variability of the bright supergiant companion of the eclipsing binary BL Tel

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58..439v&link_type=abstract

Astronomy and Astrophysics, vol. 58, no. 3, June 1977, p. 439-441.

Astronomy and Astrophysics

Astrophysics

17

Companion Stars, Eclipsing Binary Stars, Supergiant Stars, Ubv Spectra, Variable Stars, F Stars, Graphs (Charts), Light Curve, Orbital Velocity, Radial Velocity

Scientific paper

A discussion is presented of the variability of the binary BL Tel outside the eclipse with the aid of published radial velocity and photometric observations. The average period for this oscillation, which is caused by the F type supergiant companion is 65.1 d. However, this variability is not strictly periodic. The shape of the light-curve is subject to strong variations. Radial velocity and light-curves are in phase with each other, making the star rather exceptional. It is probably not a small-range Cepheid of population I as sometimes suggested.

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