SIMBAD references

2017MNRAS.467...68M - Mon. Not. R. Astron. Soc., 467, 68-82 (2017/May-1)

Kinematics of subluminous O and B stars by surface helium abundance.

MARTIN P., JEFFERY C.S., NASLIM N. and WOOLF V.M.

Abstract (from CDS):

The majority of hot subdwarf stars are low-mass core-helium-burning stars. Their atmospheres are generally helium deficient; however, a minority have extremely helium-rich surfaces. An additional fraction have an intermediate surface-helium abundance, occasionally accompanied by peculiar abundances of other elements. We have identified a sample of 88 hot subdwarfs including 38 helium-deficient, 27 intermediate-helium and 23 extreme-helium stars for which radial-velocity and proper-motion measurements, together with distances, allow a calculation of galactic space velocities. We have investigated the kinematics of these three groups to determine whether they belong to similar or different Galactic populations. The majority of helium-deficient subdwarfs in our sample show a kinematic distribution similar to that of thick disc stars. Helium-rich sdBs show a more diverse kinematic distribution. Although the majority are probably disc stars, a minority show a much higher velocity dispersion consistent with membership of a Galactic halo population. Several of the halo subdwarfs are members of the class of 'heavy-metal' subdwarfs discovered by Naslim et al.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: chemically peculiar - stars: kinematics and dynamics - subdwarfs - subdwarfs

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 95

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2021.06.19-06:13:47

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