Dust grains and gas in the circumstellar envelopes around luminous red giant stars

Abstract

view Abstract Citations (203) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Dust Grains and Gas in the Circumstellar Envelopes around Luminous Red-Giant Stars Zuckerman, B. ; Dyck, H. M. Abstract With 12, 25, 60, and 100 μm fluxes given in the IRAS Point Source Catalog, the authors have constructed color-color plots that include more than 100 infrared bright red-giant stars. Carbon-rich and oxygen-rich red giants can be distinguished from each other based on the ratio of their 25 to 60 μm fluxes. Previously, the authors reported CO rotational emission from 64 cool red giants with large fluxes in the IRAS Point Source Catalog. Here they report CO emission from an additional 15 stars as well as HCN emission toward 11 stars. The HCN data and the color-color plots are used to classify and reclassify various stars as oxygen- or carbon-rich. In 1985 June the carbon star V Hya displayed a narrow CO emission feature superposed on a standard broad stellar CO profile. The narrow emission is probably the first example of a CO maser ever seen in either a circumstellar or interstellar environment. Publication: The Astrophysical Journal Pub Date: December 1986 DOI: 10.1086/164776 Bibcode: 1986ApJ...311..345Z Keywords: Carbon Stars; Cosmic Dust; Infrared Sources (Astronomy); Infrared Stars; Red Giant Stars; Stellar Envelopes; Color-Color Diagram; Hydrocyanic Acid; Infrared Astronomy Satellite; Molecular Clouds; Pre-Main Sequence Stars; Radial Velocity; Stellar Spectra; Astrophysics; INFRARED: SOURCES; INTERSTELLAR: GRAINS; STARS: CARBON; STARS: CIRCUMSTELLAR SHELLS; STARS: LATE-TYPE full text sources ADS | data products SIMBAD (163)