Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..472l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 472-478.
Astronomy and Astrophysics
Astrophysics
24
Carbon Stars, Diffuse Radiation, Stellar Envelopes, Stellar Spectrophotometry, Astrometry, Companion Stars, Light Curve, Spectral Energy Distribution, Stellar Evolution, Stellar Spectra
Scientific paper
Photometric and spectroscopic data obtained on the carbon star CS776 in the optical and infrared ranges are presented. From a monitoring in bands J, H,K, L and M over a period of 4 years, the star is found to be slightly variable (Delta Mbol less than 0.7) without evidence of periodicity. The 0.5-60 micron energy distribution shows that the star is surrounded by a circumstellar dust shell; the properties of the dust are similar to those of dust around carbon Miras. At the kinematic distance of 1.3 kpc, the average absolute luminosity is about 10,000 solar luminosity. Optical spectra show molecular bands of C2 and CN as in carbon Miras. From an excess in bands U and B, a companion of type A3 V-III was found. This companion is shown to be physically associated to CS776 and reddened by its circumstellar material.
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