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Author Raveendran, A. V.
Source Indian Institute of Astrophysics
Content type Text
File Format PDF
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics
Subject Keyword Cosmic dust ♦ Semiregular variable stars ♦ Stellar envelopes ♦ Supergiant stars ♦ Color-color diagram ♦ Infrared astronomy satellite ♦ Mira variables ♦ Stellar composition ♦ Stellar temperature
Description In the IRAS (12)-(25), (25)-(60) color-color diagram, RV Tauri stars are found to populate cooler temperature regions, distinctly different from those occupied by the oxygen and carbon Miras. The IRAS fluxes are consistent with the dust density in the envelope varying as the inverse square of the radial distance, implying that the grain formation processes in these objects are most probably continuous and not sporadic. It is found that the spectroscopic subgroups A and B are well-separated in the far-infrared two-color diagram, with group B objects having systematically cooler dust envelopes. Thyis is interpreted as being due to a difference in the nature of grains, including the chemical composition, in the two cases.
ISSN 00358711
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Institution The Royal Astronomical Society
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