Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..763s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 763-768. Research supported by the Natural Sciences
Astronomy and Astrophysics
Astrophysics
24
Dwarf Novae, Eclipsing Binary Stars, Main Sequence Stars, Stellar Spectrophotometry, Emission Spectra, Line Spectra, Radial Velocity, Sagittarius Constellation, Stellar Evolution, Stellar Mass Accretion, Stellar Mass Ejection
Scientific paper
WY Sge, the 19th magnitude remnant of Nova WY Sagittae 1783, has been found to be an eclipsing binary with a period of 3 hr 41 minutes. Radial velocity observations show a low velocity amplitude for the emission lines originating from the vicinity of the primary star, possibly suggesting that the primary is a fairly massive (>1 M_sun;) degenerate object. The secondary, if it obeys the main-sequence mass-radius relation, is an M dwarf of 0.44 M_sun;. On one night, WY Sge was observed to be 1.6 mag brighter than normal. This outburst, along with a spectrum in quiescence more typical of dwarf novae than of classical novae at minimum, suggests that WY Sge is an object intermediate (in mass-transfer rate from the secondary star) between classical and dwarf novae.
Bond Howard E.
Dearborn David S.
Kemper Edward
Lamontagne Robert
McGraw John T.
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