Počet záznamů: 1
Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II. Kinematics
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SYSNO ASEP 0534444 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II. Kinematics Tvůrce(i) Luo, Y. (CN)
Németh, Péter (ASU-R) ORCID
Li, Q. (CN)Číslo článku 64 Zdroj.dok. Astrophysical Journal - ISSN 0004-637X
Roč. 898, č. 1 (2020)Poč.str. 10 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova blue hook stars ; white-dwarfs ; atmospheric parameters Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA18-20083S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora ASU-R - RVO:67985815 UT WOS 000555732800001 EID SCOPUS 85088981737 DOI 10.3847/1538-4357/ab98f3 Anotace We present a kinematic population classification of the four hot subdwarf helium groups based on their positions in the U - V velocity diagram, the J(Z)- eccentricity diagram, and their Galactic orbits. The overall tendency of the fractional distributions of the four hot subdwarf helium groups in the halo, thin disk, and thick disk is largely consistent with the findings reported by Luo et al. based on LAMOST DR5, which appears to support predictions of binary population synthesis. He-deficient stars with -2.2 <= log(y) < -1 likely originate from a stable Roche lobe overflow channel, He-deficient stars with log(y) < -2.2 from the common envelope ejection channel, and He-rich stars with log(y) >= 0 from the merger channel of double He white dwarf stars. The fraction of He-rich hot subdwarf stars with -1 <= log (y) < 0 in the thin disk and the halo is far higher than that in the thick disk, which implies that these stars have different formation channels in the thin disk and in the halo. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2021 Elektronická adresa https://doi.org/10.3847/1538-4357/ab98f3
Počet záznamů: 1