IUE observation of UV carbon I absorption lines in the spectrum of the C2 white dwarf L 97-3

Astronomy and Astrophysics – Astrophysics

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Absorption Spectra, B Stars, Carbon Stars, Stellar Spectra, Ultraviolet Spectra, White Dwarf Stars, Abundance, Iron, Iue, Line Spectra, Neutral Gases, Silicon, Spectrum Analysis, Stellar Atmospheres, Stellar Temperature, Ubv Spectra

Scientific paper

Extremely strong absorption features have been detected in the short wavelength UV spectrum of a cool helium-rich white dwarf, L 97-3, classified C2 weak from faint Swan band absorption in the visible. The spectrum shows the signature of neutral carbon, whose resonance lines as well as at least 4 additional lines are identified. The carbon abundance appears to be rather low with He/C ≍ 107. Strong asymmetries appear below λ1930 and λ1657 Å. It is the first time that transitions from the lowest levels of neutral carbon have been found in a stellar spectrum.

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