The unusual carbon star HD 59643 - Alternative models

Details The unusual carbon star HD 59643 - Alternative models The unusual carbon star HD 59643 - Alternative models

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...204..149j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 204, no. 1-2, Oct. 1988, p. 149-158.

Astronomy and Astrophysics

Astronomy

13

Carbon Stars, Peculiar Stars, Red Giant Stars, Stellar Models, Stellar Spectra, Accretion Disks, Binary Stars, Cool Stars, Symbiotic Stars, Ultraviolet Astronomy

Scientific paper

The authors discuss a binary model for the star in which the secondary spectrum is formed in an accretion disk. If this hot, ultraviolet-emitting disk radiates like a 20,000K black-body, it must be ≤0.03 R_sun; across at minimum emission. Large widths of C IV multiplet UV1 on high-resolution spectra indicate its formation in the inner parts of a disk. The C III] and Si III] lines, however, are much narrower (65 km s-1 FWHM) and could be formed in the outer parts of a disk or in the carbon star's chromosphere. The electron density in the region of formation of C III] is ≡1010cm-3.

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