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| 題名: | A possible detection of occultation by a proto-planetary clump in GMCephei |
| 作者: | 蕭翔耀;Chen, W. P.;Hu, S. C.-L.;Errmann, R.;Adam, Ch;Baar, S.;Berndt, A.;Bukowiecki, L.;Dimitrov, D. P.;Eisenbeiß, T.;Fiedler, S.;Ginski, Ch;Gräfe, C.;Guo, J. K.;Hohle, M. M.;Hsiao, H. Y.;Janulis, R.;Kitze, M.;Lin, H. C.;Lin, C. S.;Maciejewski, G.;Marka, C.;Marschall, L.;Moualla, M.;Mugrauer, M.;Neuhäuser, R.;Pribulla, T.;Raetz, St;Röll, T.;Schmidt, E.;Schmidt, J.;Schmidt, T. O. B.;Seeliger, M.;Trepl, L.;Briceño, C.;Chini, R.;Jensen, E. L. N.;Nikogossian, E. H.;Pandey, A. K.;Sperauskas, J.;Takahashi, H.;Walter, F. M.;Wu, Z.-Y.;Zhou, X. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Accretion;ASTRONOMY;ASTROPHYSICS;ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;Brightening;BRIGHTNESS;CEPHEIDS;COLOR;DETECTION;Disks;Earth, ocean, space;ECLIPSE;Exact sciences and technology;Flares;LUMINOSITY;MAIN SEQUENCE STARS;Photometry;PLANETS;PROTOPLANETS;STAR ACCRETION;Stars |
| 日期: | 2012-06-01 |
| 上傳時間: | 2026-04-21 14:14:20 (UTC+8) |
| 出版者: | IOP Publishing Ltd.;Bristol: IOP |
| 摘要: | 摘要： GM Cephei (GM Cep), in the young (~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 [lap]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 ~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.
出版者： Bristol: IOP
出版日期： 2012-06-01
出處： The Astrophysical journal, 2012-06, Vol.751 (2), p.118-5
資源來源： Institute of Physics Journals
版權： 2015 INIST-CNRS
識別號： ISSN: 0004-637X
識別號： EISSN: 1538-4357
識別號： DOI: 10.1088/0004-637X/751/2/118
識別號： CODEN: ASJOAB |
| 顯示於類別: | [天文研究所] 期刊論文
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