The ultraviolet spectrum of the companion of Mira (o Ceti) Observational evidence for a disk formed by wind accretion

Details The ultraviolet spectrum of the companion of Mira (o Ceti) Observational evidence for a disk formed by wind accretion The ultraviolet spectrum of the companion of Mira (o Ceti) Observational evidence for a disk formed by wind accretion

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..275r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 1, 1985, p. 275-287.

Astronomy and Astrophysics

Astronomy

74

Companion Stars, Mira Variables, Stellar Envelopes, Stellar Mass Accretion, Stellar Spectrophotometry, Stellar Winds, Ultraviolet Spectra, Variable Stars, Emission Spectra, Iue, Spaceborne Astronomy, Spectral Line Width, Stellar Luminosity, Stellar Mass Ejection

Scientific paper

The authors present extensive IUE observations of the companion of Mira (ο Cet B). It is shown that the UV continuum observed with IUE is exclusively due to Mira B at Mira A minimum. The UV continuum appears to vary erratically with a total range of ±30% within days or weeks. The white dwarf companion of Mira A itself is not seen and must be cooler than 14,000K. The observations imply the existence around Mira B of a thin, rotating disk with a typical radius of r ≈ 1011cm. The disk thickness D is determined as 8×109 > D > 2.4×108cm. The disk rotational velocity is seen to increase from 135 km s-1 in the cool outer layers to 1000 km s-1 in the innermost region. The accretion rate onto the WD is estimated as 0.5×1017g s-1 which yields an accretion luminosity of 5×1033ergs s-1, sufficient to account for the estimated Mira B luminosity.

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