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
Herbst
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Rodriguez-Ledesma;Pintado;Boudreault;Hessman;Herbst

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目的研究了异常的高振幅极低质量主序前周期变量CHS 7797的光谱特征。方法本研究基于2011年3月使用GMOS-GEMINI -S进行的6450−8600 Å范围内的光学中分辨率(R= 2200)光谱。CHS 7797在17.8 d周期的两个不同阶段进行了观测,即最大值(I≈17.4 mag)和最大值(I≈18.5 mag)前4天。在这两个阶段使用了4种不同的光谱指数进行光谱分类,它们都很适合于年轻矮星和被遮挡的晚矮星的光谱分类。此外,利用重力敏感的Na I (8183/8195 Å)和K I (7665/7699 Å)双线线确认了CHS 7797的年轻年龄。结果从最大光处获得的光谱得到的光谱型(SpT)为M 6.05±0.25,从最大光前4天的光谱得到的光谱型(SpT)为M 5.75±0.25。衍生的spt证实CHS 7797的质量在恒星-亚恒星边界质量范围内。此外,在两个观测相中得出的spt的微小差异可能间接暗示CHS 7797是一个由倾斜的环双星盘包围的质量成分相似的双星系统,类似于KH 15D的系统。
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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发表时间: 2008
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影响因子: 64.8
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