ALMA Monitoring of Millimeter Line Variation in IRC +10216. I. Overview of Millimeter Variability
He,J. H.1,2,3; Kamiński,T.4; Mennickent,R. E.5; Shenavrin,V. I.6; Mardones,Diego3; Wang,Wei2; Tang,Baitian7; Schmidt,M. R.8; Szczerba,R.8; Ge,Jixing.3
Source PublicationThe Astrophysical Journal
AbstractAbstract Temporal variation of millimeter lines is a new direction of research for evolved stars. It has the potential to probe the dynamical wind-launching processes from a time dimension. We report here the first Atacama Large Millimeter Array (ALMA) results that cover 817 days of ongoing monitoring of 1.1 mm lines in the archetypal carbon star IRC +10216. The monitoring is done with the compact 7 m array and in infrared with a 1.25 m telescope in Crimea. High sensitivity of the cumulative spectra covering a total of ~7.2 GHz between 250 and 270 GHz has allowed us to detect about 148 known transitions of 20 molecules, together with more of their isotopologues, and 81 unidentified lines. An overview of the variabilities of all detected line features is presented in spectral plots. Although a handful of lines are found to be very possibly stable in time, most other lines are varying either roughly in phase or in anticorrelation with the near-infrared light. Several lines have their variations in the ALMA data coincident with existing single-dish monitoring results, while several others do not, which requires a yet-unknown mechanism in the circumstellar envelope to explain.
Keywordline: identification line: profiles stars: AGB and post-AGB stars: carbon stars: individual (IRC +10216) stars: winds, outflows
WOS IDIOP:0004-637X-883-2-ab3d37
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China;
2.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
3.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
4.Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA, USA
5.Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile
6.Sternberg Astronomical Institute, Moscow M.V. Lomonosov State University, Universitetskij pr., 13, Moscow, 119992, Russia
7.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, People's Republic of China
8.N. Copernicus Astronomical Center, Rabiańska 8, 87-100 Toruń, Poland
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
He,J. H.,Kamiński,T.,Mennickent,R. E.,et al. ALMA Monitoring of Millimeter Line Variation in IRC +10216. I. Overview of Millimeter Variability[J]. The Astrophysical Journal,2019,883(2).
APA He,J. H..,Kamiński,T..,Mennickent,R. E..,Shenavrin,V. I..,Mardones,Diego.,...&Ge,Jixing..(2019).ALMA Monitoring of Millimeter Line Variation in IRC +10216. I. Overview of Millimeter Variability.The Astrophysical Journal,883(2).
MLA He,J. H.,et al."ALMA Monitoring of Millimeter Line Variation in IRC +10216. I. Overview of Millimeter Variability".The Astrophysical Journal 883.2(2019).
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