Observations of an emission nebula associated with the carbon star UV AUR

Astronomy and Astrophysics – Astrophysics

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B Stars, Carbon Stars, Interstellar Radiation, Nebulae, Stellar Spectra, Atmospheric Models, Interstellar Extinction, Iue, Shock Fronts, Ultraviolet Absorption, Visible Spectrum

Scientific paper

Optical and UV spectra from the stellar object UV Aur B were analyzed with model atmospheres and in terms of the UV absorption feature. The Coudespectrograph data were obtained with the ESO 1.5 m telescope. Three tracings of the B star spectrum indicated that the Balmer emission lines form in a nebula located between the two stars or mainly from a carbon star. The effective temperature and interstellar reddening of the B star were calculated to be 14,000 K and within 0.02 of 0.21, respectively. The B star rotational velocity was determined to be within 20 km/sec of 170 km/sec. A low value of the Lyman alpha flux indicated that the B star companion of UV Aur was not the ionizing source for the nebula, and the presence of a third star is suggested in the form of hot white dwarf with a temperature of at least 60,000 K.

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