Ultraviolet spectra and chromospheres of cool carbon stars

Details Ultraviolet spectra and chromospheres of cool carbon stars Ultraviolet spectra and chromospheres of cool carbon stars

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..329j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 329-340.

Astronomy and Astrophysics

Astrophysics

26

Carbon Stars, Chromosphere, Cool Stars, Stellar Atmospheres, Stellar Spectra, Ultraviolet Spectra, Emission Spectra, Line Spectra, Stellar Radiation

Scientific paper

The authors assemble and discuss all available low-resolution IUE spectra of N-type carbon stars - including TW Hor, BL Ori, UU Aur, NP Pup, U Hya, T Ind, and TX Psc. Identification of spectral features is aided by a composite spectrum. Shortward of 2850 A only emission lines of C II, Mg II, Al II, and Fe II are seen, while the spectrum longward of 2850 A appears to be a photospheric absorption spectrum with a few superposed emission lines of Fe II. The most prominent absorption features are due to Fe I, CH, and CaCl. The emission feature at 2325 A, second only to Mg II in strength, is conclusively identified as C II (UV 0.01). Ultraviolet spectra of N-type carbon stars are similar to, though the emission-line fluxes are generally weaker than, those of the coolest M-giant stars available, such as HD 18191 (M6 III).

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