A POSSIBLE DETECTION OF OCCULTATION BY A PROTO-PLANETARY CLUMP IN GM Cephei
文献类型：期刊论文
| 作者 | Chen, W. P.1; Hu, S. C. -L.1,2; Errmann, R.3; Adam, Ch.3; Baar, S.3; Berndt, A.3; Bukowiecki, L.4; Dimitrov, D. P.5,6; Eisenbeiss, T.3; Fiedler, S.3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-06-01 |
| 卷号 | 751期号:2 |
| 关键词 | occultations planets and satellites: formation protoplanetary disks stars: individual (GM Cephei) stars: pre-main sequence stars: variables: T Tauri, Herbig Ae/Be |
| 英文摘要 | GM Cephei (GM Cep), in the young (similar to 4 Myr) open cluster Trumpler 37, has been known to be an abrupt variable and to have a circumstellar disk with a very active accretion. Our monitoring observations in 2009-2011 revealed that the star showed sporadic flare events, each with a brightening of less than or similar to 0.5 mag lasting for days. These brightening events, associated with a color change toward blue, should originate from increased accretion activity. Moreover, the star also underwent a brightness drop of similar to 1 mag lasting for about a month, during which time the star became bluer when fainter. Such brightness drops seem to have a recurrence timescale of a year, as evidenced in our data and the photometric behavior of GM Cep over a century. Between consecutive drops, the star brightened gradually by about 1 mag and became blue at peak luminosity. We propose that the drop is caused by the obscuration of the central star by an orbiting dust concentration. The UX Orionis type of activity in GM Cep therefore exemplifies the disk inhomogeneity process in transition between the grain coagulation and the planetesimal formation in a young circumstellar disk. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000304204600039 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6086]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Natl Cent Univ, Grad Inst Astron, Jhongli 32001, Taiwan 2.Taipei Astron Museum, Taipei 11160, Taiwan 3.Inst Astrophys, D-07745 Jena, Germany 4.Nicholas Copernicus Univ, Torun Ctr Astron, PL-87100 Torun, Poland 5.Bulg Acad Sc, Inst Astron, Sofia 1784, Bulgaria 6.Bulg Acad Sc, NAO, Sofia 1784, Bulgaria 7.Univ Kiel, D-24098 Kiel, Germany 8.Vilnius Univ, Moletai Observ, Vilnius, Lithuania 9.Gettysburg Coll Observ, Dept Phys, Gettysburg, PA 17325 USA 10.Slovak Acad Sci, Astron Inst, Tatranska Lomnica 05960, Slovakia |
| 推荐引用方式 GB/T 7714 | Chen, W. P.,Hu, S. C. -L.,Errmann, R.,et al. A POSSIBLE DETECTION OF OCCULTATION BY A PROTO-PLANETARY CLUMP IN GM Cephei[J]. ASTROPHYSICAL JOURNAL,2012,751(2). |
| APA | Chen, W. P..,Hu, S. C. -L..,Errmann, R..,Adam, Ch..,Baar, S..,...&Zhou, X..(2012).A POSSIBLE DETECTION OF OCCULTATION BY A PROTO-PLANETARY CLUMP IN GM Cephei.ASTROPHYSICAL JOURNAL,751(2). |
| MLA | Chen, W. P.,et al."A POSSIBLE DETECTION OF OCCULTATION BY A PROTO-PLANETARY CLUMP IN GM Cephei".ASTROPHYSICAL JOURNAL 751.2(2012). |
入库方式： OAI收割
来源：国家天文台
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