SIMULTANEOUS OBSERVATIONS OF SiO AND H{sub 2}O MASERS TOWARD SYMBIOTIC STARS
Journal Article
·
· Astrophysical Journal
- Korean VLBI Network, Korea Astronomy and Space Science Institute, P.O. Box 88, Yonsei University, Seongsan-ro 262, Seodaemun, Seoul 120-749 (Korea, Republic of)
We present the results of simultaneous observations of SiO v = 1, 2, J = 1-0, {sup 29}SiO v = 0, J = 1-0, and H{sub 2}O 6{sub 16}-5{sub 23} maser lines performed with the KVN Yonsei 21 m radio telescope from 2009 November to 2010 January. We searched for these masers in 47 symbiotic stars and detected maser emission from 21 stars, giving the first time detection from 19 stars. Both SiO and H{sub 2}O masers were detected from seven stars of which six were D-type symbiotic stars and one was an S-type star, WRAY 15-1470. In the SiO maser emission, the {sup 28}SiO v = 1 maser was detected from 10 stars, while the v = 2 maser was detected from 15 stars. In particular, the {sup 28}SiO v = 2 maser emission without the v = 1 maser detection was detected from nine stars with a detection rate of 60%, which is much higher than that of isolated Miras/red giants. The {sup 29}SiO v = 0 maser emission was also detected from two stars, H 2-38 and BF Cyg, together with the {sup 28}SiO v = 2 maser. We conclude that these different observational results between isolated Miras/red giants and symbiotic stars may be related with the presence of hot companions in a symbiotic binary system.
- OSTI ID:
- 21455039
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 719; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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