An investigation of the micro-variations of highly luminous OBA stars (Alpha CYG variables). VI - The characteristics of the S DOR type stars R71 and AG CAR

Astronomy and Astrophysics – Astrophysics

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Astronomical Photometry, Early Stars, Stellar Luminosity, Supergiant Stars, Variable Stars, A Stars, B Stars, Cygnus Constellation, Emission Spectra, Interstellar Extinction, Line Spectra, O Stars, Stellar Structure

Scientific paper

The microvariations of R71 and AG Car when both were at minimum brightness (1986-1987) were investigated based upon VBLUW photometry. For R71, a characteristic time scale of 14.3 d is found, and it is shown that the amplitude, mean brightness, and colors stayed constant. A characteristic time scale of 13.8 d is found for AG Car, and it is suggested that the V-B and (B-V)j color indices of AG Car need to be corrected for the contribution of emission lines in the blue part of the spectrum. New reddenings obtained for the two stars are higher than those used previously.

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