Extremely Low-mass White Dwarf Stars Observed in Gaia DR2 and LAMOST DR8

被引：15

作者：

Wang, Kun ^{[1
]}

Nemeth, Peter ^{[2
,3
]}

Luo, Yangping ^{[1
]}

Chen, Xiaodian ^{[1
,4
]}

Jiang, Qingquan ^{[1
]}

Cao, Xingmei ^{[1
]}

机构：

[1] China West Normal Univ, Sch Phys & Astron, Nanchong 637009, Peoples R China

[2] Czech Acad Sci, Astron Inst, CZ-25165 Ondrejov, Czech Republic

[3] Astroserver org, Foter 1, H-8533 Malomsok, Hungary

[4] Chinese Acad Sci, Key Lab Opt Astron Natl Astron Observ, Beijing 100012, Peoples R China

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 936卷 / 01期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

SUBDWARF STARS; EVOLUTION; BINARY; POPULATION; KINEMATICS; ASTROPY; I;

D O I：

10.3847/1538-4357/ac847c

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the first results from our ongoing project to study extremely low-mass (ELM) white dwarfs (WDs) (M <= 0.3M (☉)) with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra. Based on the LAMOST DR8 spectral database, we analyzed 136 ELM WD candidates selected from Gaia DR2 data and 12 known objects previously identified by the ELM Survey. The atmospheric parameters and radial velocities of these stars were obtained by fitting the LAMOST low-resolution spectra. After comparing the atmospheric parameters of the 12 known objects from this work to the results reported by the ELM Survey, we demonstrated the potential of LAMOST spectra in probing into the nature of ELM WDs. Based on the atmospheric parameters and Gaia EDR3 data, we identified 21 new high-probability ELM WDs with masses M <= 0.3M (☉) and parallax estimates that agree to within a factor of 3. Two of them, J0338+4134 and J1129+4715, show significant radial velocity variability and are very likely to be binary systems containing at least one ELM WD.

引用

页数：13

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