1998A&A...335..510M

Query : 1998A&A...335..510M

1998A&A...335..510M - Astronomy and Astrophysics, volume 335510-516 (1998/7-2)

Hot UV bright stars in globular clusters.

MOEHLER S., LANDSMAN W. and NAPIWOTZKI R.

Abstract (from CDS):

We have obtained medium-resolution spectra of seven UV-bright stars discovered on images of four southern globular clusters obtained with the Ultraviolet Imaging Telescope (UIT). Effective temperatures, surface gravities and helium abundances are derived from LTE and non-LTE model atmosphere fits. Three of the stars have sdO spectra, including M4-Y453 (Teff=58800K, logg=5.15), NGC 6723-III60 (Teff=40600K, logg=4.46) and NGC 6752-B2004 (Teff=37000K, logg=5.25). All seven stars lie along either post-extended horizontal branch (EHB) or post-early AGB evolutionary tracks. The post-early AGB stars show solar helium abundances, while the post-EHB stars are helium deficient, similar to their EHB progenitors.

Abstract Copyright: ∼

Journal keyword(s): stars: Post-AGB - globular clusters: individual: NGC 2808, NGC 6121, NGC 6723, NGC 6752 - ultraviolet: stars

VizieR on-line data: <Available at CDS (J/A+A/335/510): stars.dat spectra.dat>

Simbad objects: 18

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Number of rows : 18
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 Cl* NGC 2808 FCFC 4594 * 09 12 01.7 -64 47 34   16.656 16.626     ~ 4 0
2 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
3 Cl* NGC 2808 FCFC 2946 HB* 09 12 22.0506044513 -64 52 38.135856098 16.89 17.615 17.585     ~ 5 0
4 Cl* NGC 2808 FCFC 2947 * 09 12 22.87 -64 52 37.1   17.214 17.002     ~ 3 0
5 NGC 5139 542 * 13 25 49.9577510088 -47 22 59.766928428   12.96 12.92     ~ 12 0
6 NGC 5139 3596 HS? 13 27 46.1241336936 -47 30 58.436524836   14.140 14.163     ~ 10 0
7 NAME vZ 1128 pA* 13 42 16.7509672392 +28 26 00.616904988   14.77 15.04 15.50   O8p 80 0
8 Cl* NGC 6121 Y 453 * 16 23 22.3070791080 -26 28 03.458049924 15.03 15.914 15.857     ~ 9 0
9 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
10 2MASS J16413368+3626077 pA* 16 41 33.6668708904 +36 26 07.783784952   12.98 13.14     B2p 79 0
11 NGC 6397 162 HS* 17 40 38.4613882368 -53 38 31.347142908   13.06 13.23     sdOp 47 1
12 PN GJJC 1 PN 18 36 22.820 -23 55 18.26       13.52 12.44 ~ 102 0
13 NGC 6723 409 HS? 18 59 24.2527581288 -36 37 55.451680572   14.47 14.64     ~ 6 0
14 NGC 6723 360 HS? 18 59 28.9621560336 -36 40 47.021173104   15.36 15.61   15.692 ~ 11 0
15 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
16 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
17 Cl* NGC 6752 BUON 2004 * 19 11 05.1 -59 57 47   16.11 16.42     ~ 4 0
18 PN Ps 1 PN 21 29 59.3972661392 +12 10 26.275343735   13.39 14.06     sdO 295 0

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