Egress spectra of the new eclipsing supergiant 22 Vulpeculae

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

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..423a&link_type=abstract

In ESA 4th European IUE Conf. p 423-425 (SEE N84-35135 24-88)

Computer Science

1

Eclipsing Binary Stars, G Stars, Stellar Spectra, Supergiant Stars, Ultraviolet Spectroscopy, Iue, Stellar Atmospheres, Stellar Envelopes, Stellar Winds

Scientific paper

The G-type primary in the single-lined spectroscopic binary 22 Vul (HD 192713, Gp3 Ib-II, period 249 days) was found by IUE to eclipse its recently identified B9 main sequence companion. The system thus joins Zeta Aurigae systems in which a hot dwarf provides a probe of extended atmospheres by going behind a cool supergiant. The IUE data were obtained at scattered dates following two conjunctions. Outside of eclipse, a wind from the system with terminal velocity of 300 k/sec 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. There is a close correspondence between the 22 Vul spectra and those of interacting binaries, suggesting common properties due to relatively dense, warm plasmas in these systems.

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