2005ApJ...622L..49F


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET03:19:23

2005ApJ...622L..49F - Astrophys. J., 622, L49-L52 (2005/March-3)

Massive stars in the Sgr 1806-20 cluster.

FIGER D.F., NAJARRO F., GEBALLE T.R., BLUM R.D. and KUDRITZKI R.P.

Abstract (from CDS):

We report the discovery of additional hot and massive stars in the cluster surrounding the soft gamma repeater SGR 1806-20, based on United Kingdom Infrared Telescope and Keck near-infrared spectroscopy. Of the newly identified stars, three are Wolf-Rayet stars of types WC8, WN6, and WN7, and a fourth star is an OB supergiant. These three stars, along with four previously discovered, imply a cluster age of ∼3.0-4.5 Myr, on the basis of the presence of WC stars and the absence of red supergiants. Assuming coevality, this age suggests that the progenitor of SGR 1806-20 had an initial mass greater than ∼50 M. This is consistent with the suggestion that SGRs are postsupernova end states of massive progenitors and may suggest that only massive stars evolve into magnetars that produce SGRs. It also suggests that very massive stars can evolve into neutron stars, not just black holes, as recently predicted by theory. The cluster age also provides constraints on the very high mass object LBV 1806-20.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Evolution - Stars: Individual: Alphanumeric: LBV 1806-20 - Stars: Individual: Alphanumeric: SGR 1806-20 - Stars: Neutron

Nomenclature: Table 1: [FNG2005] NN (Nos 1-14).

CDS comments: Sgr 1806-20 cluster = [BDB2003] G010.00-00.24

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 - 2021
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9607 1
2 PSR B0525-66 Psr 05 26 00.7 -66 04 35           ~ 518 1
3 HD 161100 * 17 44 19.6736218897 -16 51 53.239913819   7.99 7.49     F6V 20 0
4 2MASS J18083671-2024542 * 18 08 36.72 -20 24 54.3           ~ 1 0
5 2MASS J18083672-2024277 * 18 08 36.72 -20 24 27.8           ~ 1 0
6 2MASS J18083796-2024164 * 18 08 37.96 -20 24 16.5           ~ 1 0
7 2MASS J18083812-2024433 * 18 08 38.12 -20 24 43.4           ~ 1 0
8 2MASS J18083812-2024347 * 18 08 38.13 -20 24 34.8           ~ 2 0
9 [FNG2005] 1 WR* 18 08 38.32 -20 24 33.5           WC8 3 0
10 2MASS J18083856-2024135 * 18 08 38.57 -20 24 13.5           ~ 1 0
11 2MASS J18083874-2024264 * 18 08 38.75 -20 24 26.5           ~ 2 0
12 NAME 1806-20 Star Cluster OpC 18 08 39.0 -20 24 39           ~ 33 1
13 [FNG2005] 4 sg? 18 08 39.16 -20 24 32.9           OBI 2 1
14 WR 111b WR* 18 08 39.24 -20 24 31.9           WC9d 5 0
15 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1118 2
16 [FNG2005] 14 * 18 08 39.40 -20 24 13.0           ~ 1 0
17 WR 111c WR* 18 08 39.42 -20 24 42.6           WN6 3 0
18 [FNG2005] 13 * 18 08 39.49 -20 24 11.8           ~ 1 0
19 WR 111d WR* 18 08 39.50 -20 24 35.9           WN7?+OBI 4 0
20 [EML2004] Star C sg? 18 08 39.51 -20 24 30.0           OBI 5 0
21 [FNG2005] 11 * 18 08 39.52 -20 24 40.0           OBI? 2 0
22 [KMN95] Star A s*b 18 08 40.312 -20 24 41.14           LBV 40 3
23 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 790 0

    Equat.    Gal    SGal    Ecl

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2020.11.28-03:19:23

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