Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR5

0518288 - ASÚ 2020 RIV US eng J - Článek v odborném periodiku
Luo, Y. - Németh, Péter - Deng, L. - Han, Z.
Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR5.
Astrophysical Journal. Roč. 881, č. 1 (2019), č. článku 7. ISSN 0004-637X. E-ISSN 1538-4357
Grant CEP: GA ČR(CZ) GA18-20083S
Institucionální podpora: RVO:67985815
Klíčová slova: kinematics and dynamics * subdwarfs * surveys
Obor OECD: Astronomy (including astrophysics,space science)
Impakt faktor: 5.746, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/ab298d

Combing Gaia DR2 with LAMOST DR5, we spectroscopically identified 924 hot subdwarf stars, among which 32 stars exhibit strong double-lined composite spectra. We measured the effective temperature T-eff, surface gravity logg, helium abundance y = nHe/nH, and radial velocities of 892 non-composite spectra hot subdwarf stars by fitting LAMOST observations with Tlusty/Synspec non-LTE synthetic spectra. We outlined four different groups in the T-eff-logg diagram with our helium abundance classification scheme and two nearly parallel sequences in the T-eff-log(y) diagram.
Trvalý link: http://hdl.handle.net/11104/0303445