Ultraviolet spectroscopic observations of VV Cephei

Astronomy and Astrophysics – Astronomy

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Cepheid Variables, Eclipsing Binary Stars, Stellar Mass Ejection, Stellar Spectra, Supergiant Stars, Ultraviolet Astronomy, Chromosphere, Emission Spectra, Late Stars, Line Spectra, Stellar Envelopes, Ultraviolet Spectra

Scientific paper

Observations with the International Ultraviolet Explorer satellite (IUE) of the recent egress of the eclipsing binary VV Cep(M2Iabep + B) are presented. Egress in the ultraviolet lagged behind the visible egress by 2 to 3 months, as a result of higher opacity of the M star atmosphere in the ultraviolet. Shortly after visible egress, the low-dispersion spectrum from 1200-1900 wavelengths was dominated by fluorescent emission lines arising in the atmosphere of the M star and excited by the ultraviolet continuum of the hot companion. High-dispersion spectra show a hot continuum blanketed by absorption lines, some of which weaken or disappear as the egress continues. A year after eclipse, the absorption spectrum is still too complex to permit determination of a spectral type for the hot companion. The Mg II h and k lines both exhibit asymmetric double-peaked emission features indicative of an expanding chromosphere in the M supergiant.

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