Periodic flare of the 6.7-GHz methanol maser in IRAS 22198+6336
| Autor: | Yoshinori Yonekura, Tomoya Hirota, Genta Takase, Kazuhito Motogi, Kenta Fujisawa, Tadashi Shimomura, Nozomu Aoki, Koichiro Sugiyama, Kotaro Niinuma, Saki Kimura, Yoshito Nagadomi |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astronomy and Astrophysics Astrophysics law.invention Stars chemistry.chemical_compound Astrophysics - Solar and Stellar Astrophysics chemistry Space and Planetary Science law Astrophysics::Solar and Stellar Astrophysics Methanol Maser Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Flare |
| Zdroj: | Publications of the Astronomical Society of Japan. 66:78 |
| ISSN: | 2053-051X 0004-6264 |
| Popis: | We have detected periodic flares of the 6.7 GHz methanol maser from an intermediate-mass star-forming region IRAS22198+6336. The maser was monitored daily in 2011, 2012, and 2013. Six flares were observed with a period of 34.6 days. The variation pattern is intermittent, and the flux ratio of the flaring and the quiescent states exceeds 30. Such intermittent variation with the short period uniquely characterizes the variation of the IRAS22198+6336 maser. At least five spectral components were identified. The spectral components varied almost synchronously, but their peak times differed by 1.8 days. These characteristics can be explained by the colliding-wind binary model. Comment: 17 pages, 6 figures, accepted to PASJ |
| Databáze: | OpenAIRE |
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