Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..951d&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, April 1986, p. 951-960. USAF-supported research.
Astronomy and Astrophysics
Astronomy
17
Astronomical Photometry, Carbon Stars, Infrared Astronomy, Spectral Energy Distribution, Astronomical Catalogs, Cosmic Dust, Flux Quantization, Stellar Color, Stellar Magnitude, Stellar Temperature
Scientific paper
Infrared photometry of 31 stars having enhanced atmospheric carbon abundances (types R, CH, Ba II) has been obtained to test for the presence of circumstellar dust emission reported by others. Supplemented by published ground-based and IRAS photometry, energy distributions spanning the range 0.33-100 microns have been examined. No new excesses large enough to be ascribed to the presence of dust having T = 1000-1500 K have been found in this survey of warm carbon stars. Some marginal evidence exists for the presence of warm (T = 300 K) dust associated with two stars. One star, BD + 17 deg 3325, earlier reported to have excess emission at 3.5 microns, has been shown to have no substantail flux excess at wavelengths as long as 4.6 microns, and perhaps 10.2 microns. The distinctive colors of carbon-rich stars are found to be caused by increased line blanketing relative to the ordinary giants, and not due to circumstellar dust emission.
Dominy James F.
Gehrz Robert D.
Lambert David L.
Mozurkewich Dave
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