2020MNRAS.491L..40K

Query : 2020MNRAS.491L..40K

2020MNRAS.491L..40K - Mon. Not. R. Astron. Soc., 491, L40 (2020/January-1)

An ancient double degenerate merger in the Milky Way halo.

KAWKA A., VENNES S. and FERRARIO L.

Abstract (from CDS):

We present an analysis and re-appraisal of the massive, carbon-enriched (DQ) white dwarf (WD) LP 93-21. Its high mass ( ≃1.1 M☉) and membership to the class of warm DQ WDs, combined with its peculiar halo kinematics suggest that this object is the product of an ancient stellar merger event, most likely that of two WDs. Furthermore, the kinematics places this object on a highly retrograde orbit driven by the accretion of a dwarf galaxy on to the Milky Way that occurred at a redshift greater than 1.5. As the product of a stellar merger LP 93-21 is probably representative of the whole class of warm/hot DQ WDs.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: individual: LP 93-21 - stars: kinematics and dynamics - white dwarfs - Galaxy: halo - Galaxy: kinematics and dynamics - Galaxy: structure

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LP 93-21 WD* 10 45 59.4246229382 +59 04 51.314702377   17.5   17.3   DQ8 57 0
2 GD 492 WD* 14 06 35.4162372480 +74 18 58.013654688   15.80 15.51 16.16   DZ 44 0
3 GALEX J193156.8+011745 WD* 19 31 56.9316163968 +01 17 44.107104876     14.20     DAZ 79 1
4 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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