Circumstellar C2 Swan band in optical carbon stars

Details Circumstellar C2 Swan band in optical carbon stars Circumstellar C2 Swan band in optical carbon stars

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003asthe..96..328i&link_type=abstract

The Astronomical Herald (ISSN 0374-2466), Vol. 96, No. 6, p. 328 - 339 (2003)

Astronomy and Astrophysics

Astronomy

Carbon Stars, Circumstellar Molecules

Scientific paper

C2 Swan band absorption lines of narrow velocity widths have clearly been detected for the first time in a number of optical carbon stars using HIDES. It is found that the narrow C2 absorption lines are seen in stars having effective temperature lower than 2800K and C/O greater than 1.1. Radial velocity and rotational excitation temperature of the absorbing gas locate the gas layer in the circumstellar region. Our discovery demonstrates a common existence of circumstellar molecular absorption lines in cool mass-losing stars in the optical wavelength region. With our discovery it has become possible to determine the precise outflow velocity of the circumstellar gas. Circumstellar C2 may be a new probe of the region with radii of 1014-1015cm from the central star. It would be possible to derive carbon isotopic ratios in these stars, and similar analyses would be applicable to Mira-type carbon stars. In future circumstellar chemistry could be developed in the optical region.

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