A Circumbinary Reservoir around BM Geminorum?

Details A Circumbinary Reservoir around BM Geminorum? A Circumbinary Reservoir around BM Geminorum?

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500..466k&link_type=abstract

Astrophysical Journal v.500, p.466

Astronomy and Astrophysics

Astronomy

24

Stars: Circumstellar Matter, Stars: Individual Constellation Name: Bm Geminorum, Ism: Dust, Extinction, Stars: Carbon, Stars: Mass Loss

Scientific paper

We report the detection of both (J = 1-0) and (J = 2-1) CO emission from the oxygen-rich circumstellar envelope around a carbon star with an oxygen-rich circumstellar envelope, BM Gem. The line has two distinct components. Unique among mass-losing carbon stars, there is a feature that is much narrower (FWHM ~ 1 km s-1) than the "normal" CO emission detected from winds. This narrow feature sits on top of a broader (FWHM = 15 km s-1) line, which is probably the emission from the "normal" wind. The most plausible interpretation of the narrow feature is that we are observing emission from a circumbinary reservoir of material, probably in the form of a distorted or puffed-up disk. We propose that this circumbinary reservoir is composed of oxygen-rich material l( over from a previous phase of mass loss that was trapped in the system by the action of an as yet undetected companion.

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