Limits on the C-12 to C-13 isotopic ratio in two white dwarfs

Details Limits on the C-12 to C-13 isotopic ratio in two white dwarfs Limits on the C-12 to C-13 isotopic ratio in two white dwarfs

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.104..347w&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 104, no. 2, Sept. 1984, p. 347-355.

Astronomy and Astrophysics

Astrophysics

6

Carbon Stars, Stellar Composition, White Dwarf Stars, Abundance, Carbon 12, Carbon 13, Ratios, Spectral Bands, Stellar Atmospheres, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

A search for the molecular 12C13C isotopic bands in two white dwarfs is described. Spectroscopic observations of the two carbon band white dwarfs, BPM 27606 and L 879-14 have been obtained. The isotopic bands have not been detected. However, upper limits to the 12C:13C abundance ratio derived from the data yield 12C:13C > 40 for BPM 27606 and 12C:13C > 8 for L 879-14. If these ratios are representative of the material in the interiors of the carbon band white dwarfs and taking the low upper limits on the N and O abundances relative to C, this is consistent with the carbon having been formed by the 3α process and not having undergone any subsequent mixing with H-rich material. In addition, the C2 vibrational bandheads are blueshifted, most probably by pressure shifts.

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