A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars

Details A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..451l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 2, p. 451-459

Astronomy and Astrophysics

Astronomy

14

Abundance, Asymptotic Giant Branch Stars, Carbon Stars, Radio Astronomy, Radio Emission, Radio Spectra, Stellar Envelopes, Stellar Spectra, Astronomical Spectroscopy, Carbon Monoxide, Cosmic Dust, Hydrocyanic Acid, Hydroxyl Radicals, Line Spectra, Silicon Oxides, Stellar Composition

Scientific paper

We report upper limits for radio emission of SiO at 86 and 43 GHz, of OH at 1612 and 1665/1667 MHz, of CO at 115 GHz and HCN at 88.6 GHz in the silicate-carbon stars. These upper limits of SiO imply that oxygen-rich material has not been detected within 2Rstar of a central star even though the detected emission from silicate dust grains, H2O and OH maser establishes the presence of oxygen-rich material from about tens to thousands of AU of a central star. The upper limit of the SiO abundance is consistent with that found in oxygen-rich envelopes. Upper limits of the mass loss rate (based on the CO data) are estimated to be between 10-6 to 10-7 solar mass/yr assuming a distance of 1.5 kpc for these stars. The absence of HCN microwave emission implies that no carbon-rich material can be detected at large distances (thousands of AU) from a central star. The lack of detections of SiO, CO, and HCN emission is most likely due to the large distances of these stars. A number of C stars were detected in CO and HCN, but only the M supergiant VX Sgr was detected in CO.

Affiliated with

Also associated with

No associations

Rating

A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A search for SiO, OH, CO and HCN radio emission from silicate-carbon stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-862879