Time Variation of SiO Masers in VX Sagittarii over an Optically Quiescent Phase
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- Ryuichi Kamohara
- 1VERA Project Office, National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588
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- Shuji Deguchi
- 3Nobeyama Radio Observatory, National Astronomical Observatory, Minamimaki, Minamisaku, Nagano 384-1305 deguchi@nro.nao.ac.jp
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- Makoto Miyoshi
- 4Division of Radio Astronomy, National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 makoto.miyoshi@nao.ac.jp
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- Zhi-Qiang Shen
- 5Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, P.R. China
Description
<jats:title>Abstract</jats:title> <jats:p>The time variation of SiO masers in a semi-regular variable, VX Sgr, was investigated in the period between 1994 and 2004 when the optical light curve exhibited an $\sim 6$-yr quiescent phase intercepting a regularly pulsating era. The quiescent period occurred with a delay of several years after a decrease in the SiO maser flux. VLBA observations of SiO masers made during this period showed no drastic spatial variation except for emission features being shifted from south-west to north-east. The SiO maser flux decrease, and a succeeding optical quiescent phase, may indicate that the stellar mass-loss rate diminished over a few years around 1994. A SiO maser flare occurring in 1999 may be a reminiscence of a final gas blow, which resulted in the optically quiescent period.</jats:p>
Journal
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- Publications of the Astronomical Society of Japan
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Publications of the Astronomical Society of Japan 57 (2), 341-345, 2005-04-25
Oxford University Press (OUP)
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Details 詳細情報について
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- CRID
- 1361137046095619200
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- ISSN
- 2053051X
- 00046264
- http://id.crossref.org/issn/00046264
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- Data Source
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- Crossref