Photometry of variable AFGL sources

Details Photometry of variable AFGL sources Photometry of variable AFGL sources

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apjs...74..785j&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 74, Nov. 1990, p. 785-817.

Astronomy and Astrophysics

Astronomy

60

Infrared Sources (Astronomy), Infrared Stars, Mira Variables, Stellar Oscillations, Stellar Spectrophotometry, Asymptotic Giant Branch Stars, Red Giant Stars, Stellar Luminosity

Scientific paper

Results of infrared photometric observations of 63 AFGL sources over the past 9 years are presented. Using these data together with previous measurements of these stars, pulsation periods and mean photometric characteristics are determined. These stars are found to lie midway between optically identified Mira variables and the radio-luminous OH/IR stars in their period distribution and photometric properties. For the sample as a whole, there is no evidence for sudden or transient behavior such as a switch in pulsation mode. Rather, these stars suggest rapid, but continuous, evolution from shorter period Miras with weak mass loss to longer periods and larger mass-loss rates. The carbon-rich stars in the sample have the same period distribution as the oxygen-rich stars. None of the carbon stars have periods as long as those of the very long period radio-luminous OH/IR stars.

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