Optical Absorption and Emission Bands of SiC 2 in Carbon Stars

Details Optical Absorption and Emission Bands of SiC 2 in Carbon Stars Optical Absorption and Emission Bands of SiC 2 in Carbon Stars

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...471l.107s&link_type=abstract

Astrophysical Journal Letters v.471, p.L107

Astronomy and Astrophysics

Astronomy

13

Stars: Carbon, Stars: Circumstellar Matter, Ism: Molecules, Stars: Individual Alphanumeric: Iras 12311-3509, Stars: Individual Constellation Name: T Muscae

Scientific paper

Observations of the Merrill-Sanford bands of SiC2 in the 4750--5050 A spectral region, seen in absorption in some carbon stars and in emission in IRAS 12311-3509, are reported. Vibrational band assignments based on recent laser-based laboratory electronic spectroscopy of this molecule constitute substantial revisions compared with earlier work. Vibrational hot bands are very strong when present in carbon stars, but were greatly weakened in T Mus for a time in 1994, indicating that the bands were then formed in a cooler region than that typical of carbon star photospheres. Emission bands of SiC2, with intensities that are consistent with optical excitation of cool gas, appear in IRAS 12311-3509 which is probably a J-type carbon star occulted by a dusty disk so that the star is seen by reflection from material out of the plane of the disk.

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