Egress spectra of the new eclipsing supergiant 22 Vulfeculae

Details Egress spectra of the new eclipsing supergiant 22 Vulfeculae Egress spectra of the new eclipsing supergiant 22 Vulfeculae

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..369a&link_type=abstract

In its Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 369-372 (SEE N85-20961 11-89)

Astronomy and Astrophysics

Astronomy

4

Eclipsing Binary Stars, Egress, G Stars, Hot Stars, Iue, Supergiant Stars, Ultraviolet Spectroscopy, White Dwarf Stars, Zeta Aurigae Star, Auriga Constellation, Ultraviolet Astronomy, Ultraviolet Spectra

Scientific paper

The G-type primary in the single-lined spectroscopic binary 22 Vul (HD 192713, G3p Ib-II, period 249 days) was found with IUE in April 1983 to eclipse its recently identified b9 main sequence companion. The system joins the few known Zeta-Aurigae systems in which a hot dwarf can be used to probe the extended atmosphere of a cool supergiant. Outside of eclipse, a wind from the system with terminal velocity of 300 k/s is conspicuous in the Mg II lines. Enhanced Fe II absorption seen well away from geometrical eclipse implies an extensive envelope around the G-star. Some of the 22 Vul spectra closely resemble those of other interacting binaries, which suggests common properties of relatively dense, warm plasmas in these systems.

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