2015MNRAS.451.4259C


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.22CET09:50:26

2015MNRAS.451.4259C - Mon. Not. R. Astron. Soc., 451, 4259-4265 (2015/August-3)

Optical spectroscopy of candidate Alpha Persei white dwarfs.

CASEWELL S.L., DOBBIE P.D., GEIER S., LODIEU N. and HAMBLY N.C.

Abstract (from CDS):

As part of an investigation into the high-mass end of the initial mass-final mass relation we performed a search for new white dwarf members of the nearby (172.4 pc), young (80-90 Myr) α Persei open star cluster. The photometric and astrometric search using the United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey and SuperCOSMOS sky surveys discovered 14 new white dwarf candidates. We have obtained medium resolution optical spectra of the brightest 11 candidates using the William Herschel Telescope and confirmed that while 7 are DA white dwarfs, 3 are DB white dwarfs and 1 is an sdOB star, only three have cooling ages within the cluster age, and from their position on the initial mass-final mass relation, it is likely none are cluster members. This result is disappointing, as recent work on the cluster mass function suggests that there should be at least one white dwarf member, even at this young age. It may be that any white dwarf members of α Per are hidden within binary systems, as is the case in the Hyades cluster, however the lack of high-mass stars within the cluster also makes this seem unlikely. One alternative is that a significant level of detection incompleteness in the legacy optical image survey data at this Galactic latitude has caused some white dwarf members to be overlooked. If this is the case, Gaia will find them.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): white dwarfs

Nomenclature: Table 1: [CDG2015] APWDNN (Nos 01-14).

Simbad objects: 23

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Number of rows : 23

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [CDG2015] APWD1 WD* 03 06 23.9734171376 +46 43 11.401865486           DA 1 0
2 [CDG2015] APWD2 WD* 03 06 34.6793116668 +48 59 13.981765047           DA 1 0
3 [CDG2015] APWD3 WD? 03 06 41.7077427488 +48 44 43.674267241           ~ 1 0
4 [CDG2015] APWD4 WD* 03 09 02.5562502471 +45 52 34.263201859           DA 1 0
5 [CDG2015] APWD5 WD* 03 13 32.2869835378 +50 01 54.307831760           DA 1 0
6 [CDG2015] APWD6 WD? 03 14 18.4006005681 +51 36 08.881372145           ~ 1 0
7 [CDG2015] APWD7 WD* 03 15 27.4368986610 +45 51 48.067702999           DA 1 0
8 [CDG2015] APWD8 HS* 03 15 41.4807483122 +46 52 11.076360288           sdOB 1 0
9 [CDG2015] APWD9 WD* 03 17 13.6044892605 +44 45 17.212383039           DA 1 0
10 [CDG2015] APWD10 WD* 03 17 50.0695250188 +47 02 07.866349009           DB 1 0
11 [CDG2015] APWD11 WD* 03 22 02.0980410582 +49 40 35.057100893           DB 1 0
12 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 744 0
13 [CDG2015] APWD12 WD* 03 34 51.7630850471 +47 07 17.255733076           DA 2 0
14 [CDG2015] APWD13 WD* 03 37 12.3691388047 +49 01 43.372784847           DB 1 0
15 [CDG2015] APWD14 WD? 03 38 01.5702889293 +49 25 35.865089089           ~ 1 0
16 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2925 0
17 GD 50 WD* 03 48 50.1861716368 -00 58 32.290158840 12.596 13.787 14.063 14.210 14.388 DA1.2 232 0
18 EGGR 25 WD* 03 52 11.3300644884 +24 55 48.795313569 15.42 16.32 16.52     DA1.5 70 0
19 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2605 0
20 GD 71 WD* 05 52 27.6197286025 +15 53 13.228639956 11.675 12.783 13.032 13.169 13.337 DA1.5 328 0
21 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1191 0
22 LAWD 74 WD* 19 20 34.9229875534 -07 40 00.066805378 11.553 12.345 12.290 12.229 12.164 DBQA5 195 0
23 NAME Pleiades Moving Group MGr ~ ~           ~ 231 1

    Equat.    Gal    SGal    Ecl

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2020.01.22-09:50:26

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