Searching for Black Hole Candidates by LAMOST and ASAS-SN
| Autor: | Zheng, Ling-Lin, Gu, Wei-Min, Yi, Tuan, Fu, Jin-Bo, Mu, Hui-Jun, Yang, Fan, Wang, Song, Bai, Zhong-Rui, Sou, Hao, Bai, Yu, Dong, Yi-Ze, Zhang, Hao-Tong, Lei, Ya-Juan, Wang, Junfeng, Wu, Jianfeng, Liu, Jifeng |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-3881/ab449f |
| Popis: | Most dynamically confirmed stellar-mass black holes and the candidates were originally selected from X-ray outbursts. In the present work, we search for black hole candidates in the LAMOST survey by using the spectra along with photometry from the ASAS-SN survey, where the orbital period of the binary may be revealed by the periodic light curve, such as the ellipsoidal modulation type. Our sample consists of 9 binaries, where each source contains a giant star with large radial velocity variation ($\Delta V_{\rm R} > 70~{\rm km~s^{-1}}$) and periods known from light curves. We focus on the 9 sources with long periods ($T_{\rm ph} > 5$ days) and evaluate the mass $M_2$ of the optically invisible companion. Since the observed $\Delta V_{\rm R}$ from only a few repeating spectroscopic observations is a lower limit of the real amplitude, the real mass $M_2$ can be significantly higher than the current evaluation. It is likely an efficient method to place constraints on $M_2$ by combining $\Delta V_{\rm R}$ from LAMOST and $T_{\rm ph}$ from ASAS-SN, particularly by the ongoing LAMOST Medium Resolution Survey. Comment: 12 pages, 3 figures, accepted for publication in Astronomical Journal |
| Databáze: | arXiv |
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