Tomographic separation of composite spectra - The components of the O-star spectroscopic binary AO Cassiopeiae

Tomographic separation of composite spectra - The components of the O-star spectroscopic binary AO Cassiopeiae

The UV photospheric lines of the short-period, double-lined O-star spectroscopic binary AO Cas are analyzed. Archival data from IUE (16 spectra uniformly distributed in orbital phase) were analyzed with a tomography algorithm to produce the separate spectra of the two stars in six spectral regions....

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Veröffentlicht in:The Astrophysical journal 1991-07, Vol.376 (1), p.266-271
Hauptverfasser: Bagnuolo, William G., Jr, Gies, Douglas R.
Format: Artikel
Sprache:eng
Schlagworte:
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
ALGORITHMS
ANALYTIC FUNCTIONS
Astronomy
Astrophysics
ATMOSPHERES
Binary and multiple stars
BINARY STARS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CLASSIFICATION
COMPARATIVE EVALUATIONS
DATA ANALYSIS
DIAGNOSTIC TECHNIQUES
Earth, ocean, space
EVALUATION
Exact sciences and technology
FUNCTIONS
MATHEMATICAL LOGIC
SPECTRA
Spectroscopic binaries. Close binaries
STARS
STELLAR ATMOSPHERES
TOMOGRAPHY
ULTRAVIOLET SPECTRA
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Beschreibung
Zusammenfassung:The UV photospheric lines of the short-period, double-lined O-star spectroscopic binary AO Cas are analyzed. Archival data from IUE (16 spectra uniformly distributed in orbital phase) were analyzed with a tomography algorithm to produce the separate spectra of the two stars in six spectral regions. The spectral classifications of the primary and secondary, O9.5 III and O8 V, respectively, were estimated through a comparison of UV line ratios with those in spectral standard stars. An intensity ratio of 0.5-0.7 (primary brighter) at 1600 A is compatible with the data.
ISSN:0004-637X
1538-4357
DOI:10.1086/170276