Japanese VLBI Network Observations of SiO Masers in the M-Type Giant IRC −10414

Autor:	Toshihisa Maeda, Hiroshi Imai, Naoko Matsumoto, Toshihiro Omodaka, Ryuichi Kamohara, Kosuke Ueda, Shuji Deguchi
Rok vydání:	2008
Předmět:	Physics Astronomy Astronomy and Astrophysics Astrophysics Doppler velocity Intensity ratio law.invention Space and Planetary Science law Very-long-baseline interferometry Astrophysics::Solar and Stellar Astrophysics Maser Astrophysics::Galaxy Astrophysics Very Long Baseline Array
Zdroj:	Publications of the Astronomical Society of Japan. 60:1051-1056
ISSN:	2053-051X 0004-6264
DOI:	10.1093/pasj/60.5.1051
Popis:	We present two-epoch maps of SiO masers (v = 1a ndv = 2, J = 1–0) associated with the M-type star IRC � 10414, which were obtained with the Japanese VLBI Network (JVN). The spatial and Doppler velocity distributions, and the intensity ratio of the v = 1t ov = 2( J = 1–0) lines have significantly changed for eight years since our previous Very Long Baseline Array (VLBA) observation. The maser proper motions revealed by these twoepoch observations with an interval of one month are quite random and too fast to be explained by ballistic motions of the maser clumps. The maser distributions seen in the present observations cannot be explained by a rotatinginfalling ring model implied in the previous work. We discuss the kinematical relation between the SiO and H2O masers in IRC � 10414. In the present observations, the scale sizes of SiO v = 1a ndv = 2 masers in IRC � 10414 were roughly equal, as observed in typical Mira variables.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d7a1fa608faf7ebb3f38271e58b4a93f https://doi.org/10.1093/pasj/60.5.1051 Zobrazit plný text záznamu