Computer Science
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9221215j&link_type=abstract
Unknown
Computer Science
Carbon Stars, Cosmic Dust, Interstellar Extinction, Main Sequence Stars, Stellar Envelopes, Stellar Mass, Ultraviolet Spectra, Carbon, Hydrocyanic Acid, Iue, Nitrogen, Oxygen, Red Giant Stars, Stellar Spectra, Ultraviolet Emission
Scientific paper
The IUE satellite was used to search for companions to two carbon-rich stars with oxygen-rich circumstellar envelopes, EU And and V778 Cyg. Depending upon the amount of interstellar extinction and distances (probably between 1 and 2 kpc from the Sun) to these two stars, upper limits were placed between approx. 1.5 and 6 solar mass to the mass of any main sequence companions. For the 'near' distance of 1 kpc, it seems unlikely that there are white dwarf companions because the detection would be expected of ultraviolet emission from accretion of red giant wind material onto the white dwarf. A new model is proposed to explain the oxygen-rich envelopes. If these stars have a high nitrogen abundance, the carbon that is in excess of the oxygen may be carried in the circumstellar envelopes in HCN rather than C2H2 which is a likely key seed molecule for the formation of carbon grains. Consequently, carbon particles may not form; instead, oxygen-rich silicate dust may nucleate from the SiO present in the outflow.
Hawkins Isabel
Jura Michael
No associations
LandOfFree
Carbon stars with oxygen-rich circumstellar material 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 Carbon stars with oxygen-rich circumstellar material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Carbon stars with oxygen-rich circumstellar material will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1896131