Near infrared speckle interferometry and water maser observations of carbon stars with an oxygen-rich circumstellar environment

Details Near infrared speckle interferometry and water maser observations of carbon stars with an oxygen-rich circumstellar environment Near infrared speckle interferometry and water maser observations of carbon stars with an oxygen-rich circumstellar environment

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..858e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 3, p. 858-866

Astronomy and Astrophysics

Astronomy

21

Astronomical Interferometry, Carbon Stars, Infrared Astronomy, Oxygen, Speckle Interferometry, Stellar Composition, Stellar Envelopes, Water Masers, Asymptotic Giant Branch Stars, Companion Stars, Infrared Interferometers, Interstellar Masers, Near Infrared Radiation, Stellar Luminosity

Scientific paper

We rule out the binary hypothesis for carbon stars with oxygen-rich shells by two complementary observing methods: Infrared speckle interferometry at 2.3 microns and 3.5 microns shows that the carbon stars BM Gem, EU And and V778 Cyg cannot have M-type companions of Asymptotic Giant Branch (AGB) luminosity at separations larger than 0.04 sec. Monitoring of the water maser emission in EU And and V778 Cyg over five years did not show any velocity variations exceeding 0.06 km/s/yr, which excludes the possibility that the maser emission is due to an M-type companion in a close orbit around the carbon star. From the other suggestions about the nature of these stars, the circumbinary disc model remains the most plausible. From the constancy of the water maser lines we infer a minimum radius of the disc of 45 sin i AU for a 1 solar mass star. The properties of the maser emission (variability, shape of the spectrum etc.) are inconspicuous for water masers in semicircular variable stars and give by themselves no indication to the peculiar nature of the parent stars. No water maser emission was detected from IRAS 19139+5412 (NC 83) and 21566+5309 (MQ Cyg), two other carbons stars suspected to have an oxygen rich environment.

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