Evidence for mass loss from IRAS observations of classical Cepheids

Details Evidence for mass loss from IRAS observations of classical Cepheids Evidence for mass loss from IRAS observations of classical Cepheids

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.320..726d&link_type=abstract

Nature (ISSN 0028-0836), vol. 320, April 24, 1986, p. 726-728.

Astronomy and Astrophysics

Astronomy

10

Cepheid Variables, Infrared Astronomy, Infrared Astronomy Satellite, Stellar Mass Ejection, Stellar Oscillations, Black Body Radiation, Stellar Evolution, Supergiant Stars

Scientific paper

Hypotheses and evidence regarding mass loss from classical Cepheid variable are considered. Mass loss from such stars is suspected on two grounds. First, it may provide an explanation of the persistent discrepancy between estimates of Cepheid masses based on the theories of stellar pulsation and of stellar evolution (Cox, 1980). Second, theoretical models of pulsating atmospheres (Willson and Bowen, 1985) suggest that a pulsation mechanism may be responsible for causing, or enhancing, mass loss from Cepheids. In order to test these hypotheses, evidence of anomalous mass loss was sought by making a comparison between the infrared emission of Cepheids and that of nonvariable supergiants in the same luminosity and effective temperature range. A search of the IRAS (Infrared Astronomy Satellite) Point Source Catalog (1985) found a number of Cepheids and stable supergiants which showed emission in at least one of the IRAS wavelength bands. Some long-period Cepheids showed infrared excesses with respect to their nonpulsating counterparts, while emission from Cepheids with periods of less than 10 days was comparable to the levels seen in the stable supergiants. Mass loss rates of up to 7 x 10 to the -7th solar mass per year were derived from the infrared excesses, which is sufficiently high to have a major effect on the evolution of these stars.

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