Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..298g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 298-301. Research supported by National Astronomy an
Astronomy and Astrophysics
Astronomy
Binary Stars, Cool Stars, Magnesium, Metallicity, Supergiant Stars, Ultraviolet Spectra, Chromosphere, Iue, Line Of Sight, Stellar Magnitude
Scientific paper
The IUE ultraviolet spectrum for a supergiant of type G Ia, HD 135345, is obtained for the wavelength region 2000-3000 A. In the spectrum, the continuum as well as the feature of the Mg II doublet at 2800 A is found to be anomalous. The observed level of continuum increases toward short wavelengths to 2000 A, verifying that this supergiant is actually a binary system with a hot companion. The anomalies in the magnesium doublet are the complete absence of the chromospheric emission and the very small equivalent width of the doublet absorption: the equivalent width is 4 A, which is 7.5 times smaller than that for a typical G5 star. The main parameters of the binary system are obtained, namely, spectral classes, effective temperatures, ratio of radii, and visible magnitudes.
Gurzadian Grigor A.
Kondo Yoshihiko
Perez Mario R.
Rustambekian S. S.
Terzian Yervant
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