Two micron CO absorption lines in the spectrum of Epsilon Aurigae during eclipse

Details Two micron CO absorption lines in the spectrum of Epsilon Aurigae during eclipse Two micron CO absorption lines in the spectrum of Epsilon Aurigae during eclipse

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..296h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 296-304.

Astronomy and Astrophysics

Astrophysics

11

Absorption Spectra, Accretion Disks, Carbon Monoxide, Eclipsing Binary Stars, Infrared Spectra, Stellar Spectra, Abundance, Asymptotic Giant Branch Stars, Companion Stars, Stellar Mass, Stellar Mass Accretion

Scientific paper

CO Delta-v = 2 absorption lines have been detected in the infrared eclipse spectrum of Epsilon Aur. These lines arise within a gas torus associated with the 'unseen' companion to the F Ia star. The torus is asymmetric about its center, having a CO column density at least a factor of 80 larger on its trailing edge than on its leading edge. The CO excitation temperature on the trailing edge is 1000 + or - 150 K. The largest column density observed along a line of sight through the torus to the primary is 3 x 10 to the 20th CO/sq cm. Accurate CO velocity measurements were made at third and fourth contact. Assuming that the gas follows Keplerian motion around the secondary star(s), the velocities imply M1 less than about 7 solar mass and M2 less than about 10 solar mass. These limits favor a low-mass, post-asymptotic giant branch interpretation of the F0 Ia component. (C-12)/(C-13) = 10 + or - 3 in the gas torus, indicating that the gas has been accreted from the primary. The accretion of material from the primary suggests that the UV continuum detected at wavelengths below 1400 A arises in a warm boundary layer of an accretion disk surrounding the central star(s) of the secondary.

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