SiC2 in carbon stars: Merrill-Sanford absorption bands between 4100 and 5500Å

Details SiC2 in carbon stars: Merrill-Sanford absorption bands between 4100 and 5500Å SiC2 in carbon stars: Merrill-Sanford absorption bands between 4100 and 5500Å

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.319..103s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 319, Issue 1, pp. 103-110.

Astronomy and Astrophysics

Astronomy

7

Line: Identification, Molecular Processes, Stars: Atmospheres, Stars: Carbon

Scientific paper

Observations and identifications of the Merrill-Sanford bands of the silicon dicarbide molecule are reported for a range of N and J stars. The data were recorded at 0.8-1.6Å resolution between 4100 and 5500Å. A full description of the assignments and spectral features in the stars is given. The spectra are characterized by absorption from the ground vibrational level (0,0,0) and from higher-lying vibrational levels involving one quantum of excitation in ν1, and up to two quanta in ν2 and ν3, giving rise to numerous hot-bands. The first results of rotational contour calculations are presented, and are consistent with SiC2 lying in the upper atmosphere of the star with a rotational temperature substantially lower than that of the photosphere.

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