The spectral type of CHS 7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster
The spectral type of CHS 7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster
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CHS 7797 的光谱类型 - 猎户座星云团中一个有趣的极低质量周期变量
DOI:
10.1051/0004-6361/201219748
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发表时间:
2013
影响因子:
6.5
通讯作者:
Herbst
中科院分区:
文献类型:
--
作者:
Rodriguez-Ledesma;Pintado;Boudreault;Hessman;Herbst
AimsWe present the spectroscopic characterization of the unusual high-amplitude very low mass pre-main-sequence periodic variable CHS 7797.MethodsThis study is based on optical medium-resolution (R= 2200) spectroscopy in the 6450 − 8600 Å range, carried out with GMOS-GEMINI -S in March 2011. Observations of CHS 7797 have been carried out at two distinct phases of the 17.8 d period, namely at maximum (I≈ 17.4 mag) and four days before maximum (I≈ 18.5 mag). Four different spectral indices were used for the spectral classification at these two phases, all of them well-suited for spectral classification of young and obscured lateMdwarfs. In addition, the gravity-sensitive Na I (8183/8195 Å) and K I (7665/7699 Å) doublet lines were used to confirm the young age of CHS 7797.ResultsFrom the spectrum obtained at maximum light we derived a spectral type (SpT) of M 6.05 ± 0.25, while for the spectrum taken four days before maximum the derived SpT is M 5.75 ± 0.25. The derived SpTs confirm that CHS 7797 has a mass in the stellar-substellar boundary mass range. In addition, the small differences in the derived SpTs at the two observed phases may provide indirect hints that CHS 7797 is a binary system of similar mass components surrounded by a tilted circumbinary disk, a system similar to KH 15D.
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影响因子:
64.8
作者:
W. Herbst;C. Hamilton;Katherine LeDuc;J. Winn;C. Johns–Krull;R. Mundt;M. Ibrahimov
通讯作者:
M. Ibrahimov
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
V. Grinin;H. C. Stempels;G. Gahm;S. Sergeev;A. Arkharov;O. Barsunova;L. Tambovtseva
通讯作者:
L. Tambovtseva
DOI:
10.1086/503417
发表时间:
2006
期刊:
The Astrophysical Journal
影响因子:
--
作者:
J. Winn;C. Hamilton;William J. Herbst;Jennifer L. Hoffman;M. Holman;John A. Johnson;Marc J. Kuchner
通讯作者:
Marc J. Kuchner
DOI:
10.1017/s0074180900210243
发表时间:
2003
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
I. Baraffe;G. Chabrier;P. Hauschildt
通讯作者:
P. Hauschildt
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
F. Riddick;P. Roche;P. University;U. Oxford;U. Hertfordshire
通讯作者:
U. Hertfordshire