期刊
ASTROPHYSICAL JOURNAL
卷 936, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ac87a1
关键词
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资金
- Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan [AP08856419]
- National Aeronautics and Space Administration
- Two Micron All Sky Survey
- National Science Foundation
- Russian Science Foundation [22-12-00069]
- PAPIIT [IN102120]
- Ministry of Science and Higher Education of the Russian Federation [075-15-2022-262 (13.MNPMU.21.0003)]
We present the results of optical and near-IR spectroscopy and multicolor photometry of the emission-line star MWC645, indicating it is a binary system. The variability of absorption lines suggests the presence of a cool star. Analysis of photometric and spectroscopic data, along with Gaia EDR3 distance, allows us to estimate the temperatures and luminosities of the components. The object exhibits quasi-cyclic short-period and long-period photometric variations, likely due to variable circumstellar extinction, and is identified as a member of the FS CMa group.
We present the results of optical and near-IR spectroscopy and multicolor photometry of the emission-line star MWC645, which exhibits the B[e] phenomenon. The presence of positionally variable absorption lines of a cool star detected for the first time indicates that the object is a binary system. Using a combination of the photometric and spectroscopic data as well as the Gaia EDR3 distance (D = 6.5 +/- 0.9 kpc), we disentangled the components' contributions and estimated their surface temperatures and luminosities (18, 000 +/- 2000 K and 4250 +/- 250 K, log L/L-circle dot = 4.0 +/- 0.5 and 3.1 +/- 0.3 for the hot and cool components, respectively). Quasi-cyclic short-period (months) and long-period (similar to 4 yr) photometric variations were detected in both optical and near-IR regions, and are most likely due to variable circumstellar extinction. Our analysis suggests that MWC645 is a member of the FS CMa group. The object's properties can be described by an evolutionary model of a close binary system that currently undergoes a nonconservative mass transfer between intermediate-mass stars (e.g., 7 M-circle dot + 2.8 M-circle dot).
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