The 3 micrometer spectra of candidate carbon stars

Details The 3 micrometer spectra of candidate carbon stars The 3 micrometer spectra of candidate carbon stars

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287..163g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 287, no. 1, p. 163-174

Astronomy and Astrophysics

Astronomy

19

Carbon Stars, Cosmic Dust, Infrared Astronomy, Infrared Spectra, Stellar Envelopes, Stellar Mass Ejection, Stellar Models, Astronomical Catalogs, Astronomical Photometry, Carbon, Carbon Monoxide, Color-Color Diagram, Infrared Astronomy Satellite, Infrared Telescopes, Oxygen

Scientific paper

We have searched for the 3.1 micrometer absorption feature, a well-known characteristic of optical carbon stars, in a sample of sixteen candidate carbon stars, most of which have very red colors and some of which have no optical counterparts. The sample was selected on the basis of similarity of LRS spectra to those of known carbon stars. We detected the 3.1 micrometer feature in eleven candidates, confirming them as carbon stars. There is a wide range in the strength of the feature. In general, the 3.1 micrometer feature weakens with redder (K - L) color. However, two of the reddest stars (with (K - L) = 5) show the strongest features. Models of the spectrum near the 3.1 micrometer feature show that the absence of the 3.1 micrometer feature in stars with (K - L) greater than or approximately equal to 4 is expected, because dust emission fills in the feature, if the temperature of the dust at the inner radius is approximately = 1500 K, equal to the typical condensation temperature of carbon-rich dust. The presence of a strong 3.1 micrometer feature in stars with (K - L) approximately = 5 can be explained if the dust temperature at the inner radius is less than or approximately equal to 700 K. An alternative explanation is that in those stars there may be a circumstellar contribution to the 3.1 micrometer feature.

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