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Searching for Black Hole Candidates by LAMOST and ASAS-SN
- Publication Year :
- 2019
-
Abstract
- 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.<br />Comment: 12 pages, 3 figures, accepted for publication in Astronomical Journal
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1909.06392
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.3847/1538-3881/ab449f