A study of the continuum flux and the line structure in the IUE spectrum of Beta Lyrae

Details A study of the continuum flux and the line structure in the IUE spectrum of Beta Lyrae A study of the continuum flux and the line structure in the IUE spectrum of Beta Lyrae

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..202a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 202-210. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

11

Eclipsing Binary Stars, Iue, Stellar Spectra, Ultraviolet Spectra, Continuous Spectra, Fine Structure, Nitrogen, Radial Velocity, Resonance Lines

Scientific paper

A study of the available archival IUE images of Beta Lyrae has led to the following results: (1) for lambda in the range of 1250 - 1500 A, the eclipse depth at second conjunction is slightly larger than the eclipse depth at primary conjunction; they are equal at about 1670 A; (2) the profiles of the resonance lines of SiIV (and the same seems to be true for NV and CIV) can be described as composite, formed by the superposition of a stationary P Cygni profile that suggests a velocity of approach of -170 km/s and a broad, less strong, emission that seems to yield a velocity distribution in antiphase with the velocity curve of the B8 II component of the system; and (3) the emission lines of the intercombination doublet of semiforbidden N II at about 2140 A suggest a velocity of about -130 km/s. The interpretation of the latter composite profile appears similar to the one suggested by Sahade (1966) to describe H-alpha and He I 5876 and He I 6678, and by Batten and Sahade (1973) to describe H-alpha.

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