VLBA Observation of SiO Masers in the M Giant IRC –10414

Publications of the Astronomical Society of Japan

Miyoshi, Makoto¹  Imai, Hiroshi²  Deguchi, Shuji³ 

[1] Mizusawa Astrogeodynamics Observatory, National Astronomical Observatory, Mizusawa, Iwate 023-0861;Astronomical Institute, Graduate School of Science, Tohoku University, Aoba, Sendai, Miyagi 980-8578 E-mail (HI):;Nobeyama Radio Observatory, National Astronomical Observatory, Minamimaki, Minamisaku, Nagano 384-1305

关键词: "Infrared: sources";    Masers;    "Radio sources: lines";    "Stars: circumstellar shells";    "Stars: individual (IRC –10414)";    "Stars: late-type";   

DOI  :  10.1093/pasj/51.5.587

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

WehavemappedanMgiantstar,IRC⤓10414,intheSiOJ=1–0v=1lineat43.1GHzwiththeVLBA‡withaspatialresolutionofbetterthan0.5mas.Themaserspotsspreadoveronacirclehavingaradiusofabout7.1mas.Avelocitygradientintheeast-westdirectionof∼0.7kms−1mas−1isfound.MonitoringobservationswithNobeyama45-mtelescopehaveshownthattheintensityratiooftheSiOJ=1–0v=1tov=2maserlinewasquiteunusual(5–40)fortheperiodof1997–1999inthisobject;thisratiowasknowntobeclosetounityinmanylate-typestellarobjects,butwasknowntodeviatestronglyfromunityinyoungstellarobjects.TheunusuallineintensityratioofthisstarmaysuggestachemicalorgeometricalanomalyoftheenvelopeofIRC–10414.Apossiblering/diskmodelisdiscussedinordertoexplainthedistributionofthemaserspotsinthisobject.

【 授权许可】

Unknown