IJHKL photometry of carbon stars

Details IJHKL photometry of carbon stars IJHKL photometry of carbon stars

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..139b&link_type=abstract

Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 139-141.

Astronomy and Astrophysics

Astronomy

20

Carbon Stars, Infrared Astronomy, Stellar Spectrophotometry, Variable Stars, Interstellar Extinction, Irregular Variable Stars, Oxygen, Semiregular Variable Stars, Stellar Envelopes, Stellar Spectra, Stellar Temperature

Scientific paper

IJHKL photometry is provided for 34 carbon stars, all known as variable stars. The low amplitude of variations at infrared wavelengths is confirmed for semiregular and irregular variables. In addition, an H-K versus J-H diagram shows that carbon stars populate a strip (roughly J-H greater than 1.0) with much steeper inclination than the J-H equals 0 to 1.0 sequence of oxygen stars used as standard stars in the Arizona photometry (Johnson, 1965) system. Increasing circumstellar reddening by thicker and cooler dust emission is the main explanation of the strip orientation. It is noted that the H-K versus J-H diagram for cool carbon stars is satisfactorily explained by the circumstellar shell model developed by Bergeat et al. (1976).

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