MG II profile variations of Zeta Aurigae

Details MG II profile variations of Zeta Aurigae MG II profile variations of Zeta Aurigae

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126l...5a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 2, Oct. 1983, p. L5-L7.

Astronomy and Astrophysics

Astrophysics

10

Eclipsing Binary Stars, K Stars, Magnesium, Stellar Mass Accretion, Stellar Spectra, Ultraviolet Spectra, H Ii Regions, Iue, Stellar Mass Ejection, Stellar Winds

Scientific paper

The authors have observed variations in the Mg II 2800 Å doublet of Zeta Aurigae. The Mg II profiles deviate from simple P-Cygni profiles in that they exhibit an absorption feature consistent with Chapman's (1981) interpretation of C IV absorption as evidence of a column of accretion onto the B star component of the binary. The authors find the opening angle of the shock cone, containing the accretion column to exceed 16° implying a stellar wind velocity of approximately 67 km s-1, unless the H II region temperature is unusually high. The turbulence velocity of the wind then appears to be about 33 km s-1, compared to values of order 10 km s-1 previously determined closer to the K-star surface.

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