Orbiting Molecular Reservoirs around Evolved Red Giant Stars

Details Orbiting Molecular Reservoirs around Evolved Red Giant Stars Orbiting Molecular Reservoirs around Evolved Red Giant Stars

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...521..302j&link_type=abstract

The Astrophysical Journal, Volume 521, Issue 1, pp. 302-309.

Astronomy and Astrophysics

Astronomy

75

Stars: Binaries: Visual, Stars: Circumstellar Matter, Stars: Carbon, Stars: Individual (Eu Andromedae, Bm Geminorum), Stars: Late-Type

Scientific paper

We report molecular emission from the circumstellar envelopes of two carbon-rich stars with oxygen-rich envelopes, EU And and BM Gem. We find a narrow (FWHM~5 km s^-1) CO (2-1) emission line from EU And and an even narrower (FWHM ~ 1 km s^-1) ^13CO emission line from BM Gem. We also place upper limits to the emission of HCN, SiO, SO, HCO^+, and CS from BM Gem. We argue that the narrow CO emission lines are signatures of long-lived reservoirs of orbiting gas and that standard models for CO emission from red giant winds are not appropriate for these two stars. By including the Red Rectangle and AC Her, narrow CO emission characteristic of gravitationally bound gas has been detected from four post-main-sequence systems, and we can begin to characterize these apparently similar environments. Some common characteristics are the following: (1) Their diameters are typically between ~100 and ~1000 AU. (2) The masses of CO are near 10^27 g. (3) Unlike the envelopes around mass-losing carbon stars where M_CO/M_dust~ 2, the circumstellar orbiting reservoirs often appear to have M_CO

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