Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1269e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 109, no. 3, p. 1269-1276
Astronomy and Astrophysics
Astronomy
14
Absorption Spectra, Accretion Disks, Eclipsing Binary Stars, Oxygen, Radial Velocity, Stellar Envelopes, Stellar Winds, Extinction, Spectral Line Width, Spectrographs, Spectrum Analysis, Stellar Orbits
Scientific paper
We propose a new spectroscopic approach for observing circumstellar matter in binary stars, based on the neutral oxygen lambda 7774 absorption lines. We present oxygen equivalent widths and radial velocities in 20 nondegenerate eclipsing binaries. We note limitations and advantages of using this line to trace circumstellar matter in binary systems, and confirm the presence of streams and rotating accretion disks in a number of short- long-period Algol systems. We discuss evidence for geometrically thick disks, and describe a small radial infall superimposed on disk rotation in most long-period systems. We speculate that infall may be related to viscous dissipation in disks. We emphasize the great sensitivity of lambda 7774 in studying the kinematics of circumstellar matter in many nondegenerate binary stars.
Etzel Paul B.
Olson Edward C.
Senay Matthew C.
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