AZ Cassiopeiae at the 1956-57 eclipse

Details AZ Cassiopeiae at the 1956-57 eclipse AZ Cassiopeiae at the 1956-57 eclipse

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasp...87..305m&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 87, Apr. 1975, p. 305-310.

Astronomy and Astrophysics

Astronomy

2

Astronomical Models, Cepheid Variables, Eclipsing Binary Stars, Radial Velocity, Stellar Spectra, H Alpha Line, Line Shape, Main Sequence Stars, Optical Thickness, Stellar Atmospheres, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

The spectrum of AZ Cas at the time of the 1956-57 eclipse can be described as a combination of an F8 Ib star and a main-sequence B0-I companion. The latter star is ejecting matter with approximately spherical symmetry at some 50-60 km/sec, while the former has a very extended atmosphere. The whole system seems to be also surrounded by an expanding envelope. Determinations of the spectral type of the red companion range from early-M, well before eclipse, to F8, in the present material, with a Ib-luminosity class sensibly constant. This variation is interpreted as indicating changes in the optical thickness of the envelope surrounding the late-type companion, either intrinsic (rho Cas episode) or related to the binary nature of the system.

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