Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111..962c&link_type=abstract
Astronomical Journal v.111, p.962
Astronomy and Astrophysics
Astronomy
16
Stars: Carbon, Infrared: Stars, Variables: Mira, Circumstellar Matter
Scientific paper
We present a simple analysis of the time variations of several optical spectral characteristics for a sample of optically very faint, infrared-selected, extreme carbon stars. This analysis yields estimates of stellar periods that show these dust-embedded stars to be long-period (˜1.5 yr) Mira variables. We have not found any ECS analogous to the extremely long-period OH/IR stars: the longest ECS period is ˜2 yr. We explore the relationships between amplitude of variation of Ha emission and its mean level, and discuss the likelihood that some ECS dust shells are disklike rather than spherical. We investigate the relative phasing of the cycles of Hα, sodium absorption, optical continuum colors, and infrared photometric variations. The combination of optical, near-infrared and IRAS photometry permits estimates to be made of both stellar distance and circumstellar extinction, through the bolometric luminosity.
Cohen Martin
Hitchon Keith
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