A Method to Search for Black Hole Candidates with Giant Companions by LAMOST
| Autor: | Yu Bai, Ling-Lin Zheng, Tuan Yi, Jin-Bo Fu, Hui-Jun Mu, Junfeng Wang, Jifeng Liu, Song Wang, Zhong-Rui Bai, Jianfeng Wu, Haotong Zhang, Ya-Juan Lei, Wei-Min Gu |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Metallicity FOS: Physical sciences Astronomy and Astrophysics Astrophysics Effective temperature Surface gravity Astrophysics - Astrophysics of Galaxies 01 natural sciences Astronomical spectroscopy LAMOST Delta-v (physics) Radial velocity Black hole Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| DOI: | 10.48550/arxiv.1902.02813 |
| Popis: | We propose a method to search for stellar-mass black hole (BH) candidates with giant companions from spectroscopic observations. Based on the stellar spectra of LAMOST Data Release 6, we obtain a sample of seven giants in binaries with large radial velocity variation $\Delta V_R > 80~{\rm km~s^{-1}}$. With the effective temperature, surface gravity, and metallicity provided by LAMOST, and the parallax given by {\it Gaia}, we can estimate the mass and radius of the giant, and therefore evaluate the possible mass of the optically invisible star in the binary. We show that the sources in our sample are potential BH candidates, and are worthy of dynamical measurement by further spectroscopic observations. Our method may be particularly valid for the selection of BH candidates in binaries with unknown orbital periods. Comment: 13 pages, 2 figures, accepted for publication in ApJ Letters |
| Databáze: | OpenAIRE |
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