2016ApJ...818...84C


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET14:42:44

2016ApJ...818...84C - Astrophys. J., 818, 84 (2016/February-2)

Two massive white dwarfs from NGC 2323 and the initial-final mass relation for progenitors of 4 to 6.5 M.

CUMMINGS J.D., KALIRAI J.S., TREMBLAY P.-E. and RAMIREZ-RUIZ E.

Abstract (from CDS):

We observed a sample of 10 white dwarf candidates in the rich open cluster NGC 2323 (M50) with the Keck Low-Resolution Imaging Spectrometer. The spectroscopy shows eight to be DA white dwarfs, with six of these having high signal-to-noise ratio appropriate for our analysis. Two of these white dwarfs are consistent with singly evolved cluster membership, and both are high mass ∼1.07 M, and give equivalent progenitor masses of 4.69 M. To supplement these new high-mass white dwarfs and analyze the initial-final mass relation (IFMR), we also looked at 30 white dwarfs from publicly available data that are mostly all high-mass (≳ 0.9 M). These original published data exhibited significant scatter, and to test if this scatter is true or simply the result of systematics, we have uniformly analyzed the white dwarf spectra and have adopted thorough photometric techniques to derive uniform cluster parameters for their parent clusters. The resulting IFMR scatter is significantly reduced, arguing that mass-loss rates are not stochastic in nature and that within the ranges of metallicity and mass analyzed in this work mass loss is not highly sensitive to variations in metallicity. Lastly, when adopting cluster ages based on Y2 isochrones, the slope of the high-mass IFMR remains steep and consistent with that found from intermediate-mass white dwarfs, giving a linear IFMR from progenitor masses between 3 and 6.5 M. In contrast, when adopting the slightly younger cluster ages based on PARSEC isochrones, the high-mass IFMR has a moderate turnover near an initial mass of 4 M.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: (NGC 2323, Pleiades, NGC 2516, NGC 3532, NGC 2287) - white dwarfs

Nomenclature: Table 1,3: [CKT2015] NGC 2323 WDNN N=10 among (Nos 7-38).

Simbad objects: 52

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Number of rows : 52

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 PG 0136+251 WD* 01 38 52.9776011898 +25 23 22.641038623   15.83       DA1.2 76 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2914 0
3 * eta Tau Be* 03 47 29.0765529 +24 06 18.488347 2.44 2.78 2.87 2.84 2.88 B7III 508 1
4 GD 50 WD* 03 48 50.1861716368 -00 58 32.290158840 12.596 13.787 14.063 14.210 14.388 DA1.2 231 0
5 EGGR 25 WD* 03 52 11.3300644884 +24 55 48.795313569 15.42 16.32 16.52     DA1.5 69 0
6 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2588 0
7 M 37 OpC 05 52 18 +32 33.2   6.19 5.6     ~ 327 2
8 LAWDS NGC 2168 30 WD* 06 07 56.62296 +24 13 26.8320     21.175     DA 4 0
9 LAWDS NGC 2168 29 WD* 06 08 02.1951055898 +24 25 23.924722314     20.719     DA 4 0
10 LAWDS NGC 2168 22 WD* 06 08 24.6581423481 +24 33 47.173866780     19.657     DA(H?) 7 0
11 Cl* NGC 2168 RA 1 WD* 06 08 38.792 +24 15 06.61   20.64 20.989     DA 11 0
12 LAWDS NGC 2168 2 WD* 06 08 42.315 +24 10 17.61   22.38 21.569     DA 9 0
13 NGC 2168 OpC 06 08 54 +24 20.0           ~ 449 0
14 LAWDS NGC 2168 27 WD* 06 09 06.256 +24 19 25.25   22.04 21.398     DA 11 0
15 Cl* NGC 2168 RA 3 WD* 06 09 11.5443597065 +24 27 20.670642869   20.1 20.065     DO 14 0
16 LAWDS NGC 2168 15 WD* 06 09 11.7437376490 +24 02 41.581504622   19.9 20.785 18.9   DA 9 0
17 LAWDS NGC 2168 14 WD* 06 09 15.10008 +24 33 15.0696     21.701     DA 4 0
18 Cl* NGC 2168 RA 4 WD* 06 09 23.4739804610 +24 27 21.832688377   20.2 19.863     DO 14 0
19 LAWDS NGC 2168 12 WD* 06 09 31.19928 +24 19 05.9304     21.303     DA 4 0
20 LAWDS NGC 2168 11 WD* 06 09 42.787 +24 11 05.10     21.198     DA 6 0
21 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1376 0
22 * alf CMa B WD* 06 45 09.3021501316 -16 43 00.716804119   8.41 8.44     DA1.9 490 1
23 Cl* NGC 2287 RA 2 WD* 06 45 20.6740380135 -20 31 19.487803138   18.3 20.1     DA 12 0
24 M 41 OpC 06 46 01 -20 45.4   4.89 4.5     ~ 244 0
25 Cl* NGC 2287 RA 4 * 06 46 01.080 -20 32 03.42   20.63 20.9     ~ 5 0
26 Cl* NGC 2287 RA 5 WD* 06 46 24.4002745494 -20 46 22.436820853   20.0 20.1     DA 11 0
27 [CKT2015] NGC 2323 WD21 WD? 07 02 08.56 -08 25 48.0           ~ 1 0
28 [CKT2015] NGC 2323 WD22 WD? 07 02 33.93 -08 31 04.3           ~ 1 0
29 [CKT2015] NGC 2323 WD10 WD? 07 02 41.0178108748 -08 26 12.290299000           ~ 2 0
30 NGC 2323 OpC 07 02 47.5 -08 20 16           ~ 152 0
31 [CKT2015] NGC 2323 WD7 WD? 07 02 47.9087969984 -08 35 56.393083084           ~ 1 0
32 [CKT2015] NGC 2323 WD17 WD? 07 03 12.62 -08 30 53.6           ~ 1 0
33 [CKT2015] NGC 2323 WD12 WD? 07 03 17.7758673554 -08 20 00.818254712           ~ 1 0
34 [CKT2015] NGC 2323 WD11 WD? 07 03 22.1516665030 -08 15 59.070836287           ~ 2 0
35 [CKT2015] NGC 2323 WD30 WD? 07 03 22.56 -08 29 25.7           ~ 1 0
36 [CKT2015] NGC 2323 WD38 WD? 07 03 31.87 -08 28 25.0           ~ 1 0
37 [CKT2015] NGC 2323 WD23 WD? 07 03 39.85 -08 28 16.7           ~ 1 0
38 Cl* NGC 2516 RK 3 WD* 07 57 03.1233615566 -60 54 52.801727786   18.7 19.88 19.9   DA 14 0
39 Cl* NGC 2516 RK 2 WD* 07 57 50.6466415349 -60 49 54.801047043   16.5 19.55 19.5   DA 16 0
40 Cl* NGC 2516 RK 5 WD* 07 57 53.7635594216 -60 28 49.349529578   18.7 20.09 19.5   DA 14 0
41 NGC 2516 OpC 07 58 04 -60 45.2           ~ 576 0
42 Cl* NGC 2516 RK 1 WD* 07 58 49.1643505597 -60 48 23.184496536   17.9 19.61 14.2   DA 14 0
43 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1184 0
44 Cl* NGC 3532 RK 10 WD* 11 03 15.1373882810 -58 21 44.263599614           DA 13 0
45 Cl* NGC 3532 RK 9 WD* 11 03 37.3183035973 -58 18 40.313355064           DA 11 0
46 Cl* NGC 3532 RK 1 WD* 11 05 35.8337224652 -58 52 26.465935084           DA 10 0
47 NGC 3532 OpC 11 05 39 -58 45.2           ~ 262 0
48 Cl* NGC 3532 RK 5 WD* 11 06 04.1639367341 -58 55 19.967741667           DA 13 0
49 [DDW2012] NGC 3532-WDC J1106-5905 WD? 11 06 18.3533438370 -59 05 17.290537490   20.17 20.1     ~ 3 0
50 [DDW2012] NGC 3532-WDC J1106-5843 WD? 11 06 51.6339734686 -58 43 49.042961425   20.31 20.2     ~ 3 0
51 [DDW2012] NGC 3532-WDC J1107-5842 WD? 11 07 21.9764743731 -58 42 12.500642705   20.14 20.5     ~ 3 0
52 NGC 6125 G 16 19 11.554 +57 59 02.80   13.0       ~ 83 0

    Equat.    Gal    SGal    Ecl

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2019.12.11-14:42:44

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