Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..759o&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 759-767.
Other
8
Binary Stars, H Alpha Line, Peculiar Stars, Stellar Spectrophotometry, Ubv Spectra, Charge Coupled Devices, Radial Velocity
Scientific paper
We present and analyze intermediate-band uvbyI (Kron) photometry and CCD spectroscopy of the poorly known long-period system WW And. Early visual photometry suggested a totally eclipsing geometry, while our new data clearly show shallower partial eclipses. Double-peaked H-alpha emission is prominent at all orbital phases and times, indicating the presence of a permanent accretion disk around the hotter mass-gaining star. Photometric and radial-velocity solutions with the new Wilson code yield estimates of absolute system parameters. These simultaneous multicolor photometric solutions suggest that the cool star does not quite fill its Roche lobe, and that mass transfer in this binary probably occurs by some mechanism other than lobe overflow. WW And may share with RW Per a historical trend of gradually decreasing primary eclipse depth.
Etzel Paul B.
Olson Edward C.
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