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标题：Gas infall and possible circumstellar rotation in R Leonis ⋆
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作者：J. P. Fonfría ; M. Santander-García ; J. Cernicharo 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：622
DOI：10.1051/0004-6361/201834840
语种：English
出版社：EDP Sciences
摘要：We present new interferometer molecular observations of R Leo taken at 1.2 mm with the Atacama Large Millimeter Array with an angular resolution up to ≃0.″026. These observations permitted us to resolve the innermost envelope of this star, which revealed a complex structure that involves extended continuum emission and molecular emission showing a non-radial gas velocity distribution. This molecular emission displays prominent red-shifted absorptions located immediately in front of the star, which are typical footprints of material infall. This emission also shows lateral gas motions compatible with a torus-like structure.
关键词：enstars: AGB and post-AGBstars: individual: R Leocircumstellar matterstars: mass-losstechniques: interferometrictechniques: high angular resolution