2004A&A...420..515M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET22:22:09

2004A&A...420..515M - Astronomy and Astrophysics, volume 420, 515-525 (2004/6-3)

Spectral types and masses of white dwarfs in globular clusters.

MOEHLER S., KOESTER D., ZOCCALI M., FERRARO F.R., HEBER U., NAPIWOTZKI R. and RENZINI A.

Abstract (from CDS):

White dwarfs in globular clusters offer additional possibilities to determine distances and ages of globular clusters, provided their spectral types and masses are known. We therefore started a project to obtain spectra of white dwarfs in the globular clusters NGC 6397 and NGC 6752. All observed white dwarfs show hydrogen-rich spectra and are therefore classified as DA. Analysing the multi-colour photometry of the white dwarfs in NGC 6752 yields an average gravity of logg=7.84 and 0.53M as the most probable average mass for globular cluster white dwarfs. Using this average gravity we try to determine independent temperatures by fitting the white dwarf spectra. While the stellar parameters determined from spectroscopy and photometry usually agree within the mutual error bars, the low resolution and S/N of the spectra prevent us from setting constraints stronger than those derived from the photometry alone. For the same reasons the white dwarf spectra obtained for NGC 6397 unfortunately do not provide an independent distance estimate of sufficient accuracy to distinguish between the long and short distance scale for globular clusters.

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - Galaxy: globular clusters: individual: NGC 6397 - Galaxy: globular clusters: individual: NGC 6752

Nomenclature: Table 2: Cl* NGC 6752 WF N-NNNN N=12.

Simbad objects: 27

goto Full paper

goto View the reference in ADS

Number of rows : 27

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3575 0
2 LP 916-15 PM* 15 38 59.6477173130 -28 35 36.970418054   12.19 11.62     A 104 0
3 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1685 0
4 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1808 1
5 Cl* NGC 6397 WF 4-358 WD* 17 40 58.52 -53 42 25.3     22.73   22.71 DA 5 0
6 Cl* NGC 6397 WF 2-846 WD* 17 41 01.78 -53 44 47.2     24.30   23.97 DA 4 0
7 Cl* NGC 6397 WF 2-51 WD* 17 41 04.52 -53 43 55.8     24.00   23.72 DA 4 0
8 Cl* NGC 6397 WF 2-479 WD* 17 41 07.06 -53 44 45.1     23.87   23.65 DA 4 0
9 CD-44 12736 PM* 18 36 25.9487430436 -44 18 36.919462094   10.83 10.22     G0 196 0
10 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1817 0
11 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 221 0
12 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2923 0
13 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 104 0
14 Feige 110 HS* 23 19 58.3995050606 -05 09 56.170282845 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 560 1
15 GD 248 WD* 23 26 06.5870632822 +16 00 19.282796891 14.431 15.206 15.112 15.034 14.977 DA5 75 0
16 Cl* NGC 6752 WF 3-6454 WD* ~ ~           DA 1 0
17 Cl* NGC 6752 WF 2-5639 WD* ~ ~           DA 1 0
18 Cl* NGC 6752 WF 4-2081 WD* ~ ~           DA 1 0
19 Cl* NGC 6752 WF 3-3584 WD* ~ ~           DA 1 0
20 Cl* NGC 6752 WF 2-3648 WD* ~ ~           DA 1 0
21 Cl* NGC 6752 WF 2-241 WD* ~ ~           DA 1 0
22 Cl* NGC 6752 WF 4-1700 WD* ~ ~           DA 1 0
23 Cl* NGC 6752 WF 3-296 WD* ~ ~           DA 1 0
24 Cl* NGC 6752 WF 3-1610 WD* ~ ~           DA 1 0
25 Cl* NGC 6752 WF 3-4909 WD* ~ ~           DA 1 0
26 Cl* NGC 6752 WF 4-2003 WD* ~ ~           DA 1 0
27 Cl* NGC 6752 WF 3-6441 WD* ~ ~           DA 1 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004A&A...420..515M and select 'bookmark this link' or equivalent in the popup menu


2020.10.29-22:22:09

© Université de Strasbourg/CNRS

    • Contact