Variability of ultraviolet emission in the carbon star TX PISCIUM

Details Variability of ultraviolet emission in the carbon star TX PISCIUM Variability of ultraviolet emission in the carbon star TX PISCIUM

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..960j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 960-968.

Astronomy and Astrophysics

Astrophysics

17

Carbon Stars, Cool Stars, Emission Spectra, Line Spectra, Periodic Variations, Ultraviolet Spectra, Iue, Radiant Flux Density, Spectral Energy Distribution, Stellar Spectrophotometry

Scientific paper

Multiple low-resolution IUE observations of the cool carbon star TX Psc (NO; C6,2) permit an analysis of the variations in strength of the strongest emission lines - the Mg II line at 2800 Å, the C II line at 2330 Å, and certain Fe II lines. In the present sample of nine spectra, the integrated flux of the Mg II line varies by at least a factor of 8, while that of the C II line varies by at least a factor of 5. The continuous flux in the best observed range from 2800 to 3200 Å does not vary noticeably. Possible mechanisms for the production of these variable emission lines are reviewed.

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