Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...74..133h&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 74, no. 1, July 1988, p. 133-144.
Astronomy and Astrophysics
Astronomy
7
Astronomical Catalogs, Asymptotic Giant Branch Stars, Infrared Astronomy Satellite, Stellar Mass Ejection, Variable Stars, Interstellar Matter, Late Stars, Star Distribution, Statistical Analysis, Stellar Color
Scientific paper
Asymptotic giant branch stars with long period variability have been selected from the IRAS catalogues based upon the ratio of the 12 μm and 25 μm flux densities and upon the IRAS variability index. The stars occupy a single, narrow strip in the 12/25 versus 25/60 μm colour-colour diagram. The luminosity distribution is found to be independent of mass loss rate. The time evolution of the mass loss rate is determined directly from the observations for the first time and is found to be steeper than an exponential. The ratio of stars with carbon-rich and with oxygen-rich envelopes is 1:5. Locally, the mass returned to the interstellar medium by asymptotic giant branch stars amounts to 10-10M_sun;pc-2yr-1.
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