2021ApJ...913...30F

Query : 2021ApJ...913...30F

2021ApJ...913...30F - Astrophys. J., 913, 30-30 (2021/May-3)

The mass and age distribution of halo white dwarfs in the Canada-France Imaging Survey.

FANTIN N.J., COTE P., McCONNACHIE A.W., BERGERON P., CUILLANDRE J.-C., DUFOUR P., GWYN S.D.J., IBATA R.A. and THOMAS G.F.

Abstract (from CDS):

We present optical spectroscopy for 18 halo white dwarfs identified using photometry from the Canada-France Imaging Survey and Pan-STARRS1 DR1 3π survey combined with astrometry from Gaia DR2. The sample contains 13 DA, 1 DZ, 2 DC, and 2 potentially exotic types of white dwarf. We fit both the spectrum and the spectral energy distribution in order to obtain the temperature and surface gravity, which we then convert into mass and then age using stellar isochrones and the initial-to-final mass relation. We find a large spread in ages that is not consistent with expected formation scenarios for the Galactic halo. We find a mean age of 9.03–2.03+2.13 Gyr and a dispersion of 4.21–1.58+2.33 Gyr for the inner halo using a maximum-likelihood method. This result suggests an extended star formation history within the local halo population.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): White dwarf stars - DA stars - DZ stars

Simbad objects: 24

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Number of rows : 24
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 SDSS J080848.96+434215.5 WD* 08 08 48.9629871672 +43 42 15.395000508           DA 9 0
3 LSPM J0823+3111 WD* 08 23 59.1710542896 +31 11 54.532659480   17.8   18.7   DA 20 0
4 SDSS J084249.43+333845.0 WD* 08 42 49.4482183896 +33 38 45.276322884           DA 8 0
5 GALEX J085115.4+271355 WD* 08 51 15.4400451768 +27 13 55.602975540           DA 7 0
6 GALEX J112131.3+320013 WD* 11 21 31.3005586008 +32 00 13.281044580           DA 4 0
7 GALEX J113327.5+471137 WD* 11 33 27.6122294520 +47 11 37.362214932           DA 7 0
8 GALEX J113859.1+515648 WD* 11 38 59.0964631368 +51 56 48.918868476           DA 7 0
9 GALEX J114755.6+475814 WD* 11 47 55.7015840400 +47 58 14.448029412           DA 8 0
10 GALEX J115751.1+470124 WD? 11 57 51.0961831752 +47 01 24.464205156           ~ 4 0
11 GALEX J123125.3+331213 WD* 12 31 25.4121926832 +33 12 12.599166240           DC 6 0
12 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 268 0
13 GALEX J123805.7+332523 WD* 12 38 05.7615038904 +33 25 24.146060412           DA 7 0
14 LSPM J1240+6710 WD* 12 40 43.4562545952 +67 10 35.934816900   17.6   18.7   DQ 21 0
15 GALEX J130334.3+333845 WD? 13 03 34.3208908560 +33 38 45.457555272           ~ 4 0
16 LSPM J1345+4001 WD* 13 45 52.1345717640 +40 01 01.708783500   18.5   19.1   DA 20 0
17 GALEX J140012.0+203654 WD* 14 00 12.0038222496 +20 36 54.394718148           ~ 2 0
18 GALEX J143032.5+283912 WD? 14 30 32.5663030008 +28 39 12.858953076           ~ 4 0
19 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
20 SDSS J163712.23+363154.9 WD* 16 37 12.2398048992 +36 31 54.882989184           DBQ: 9 0
21 GALEX J172802.9+232913 WD? 17 28 02.8851819552 +23 29 13.441291620           ~ 3 0
22 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
23 Gaia DR3 2827424288613584128 WD? 23 28 55.7576269776 +21 38 26.676521088           ~ 3 0
24 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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