2004A&A...419..713M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET01:58:59

2004A&A...419..713M - Astronomy and Astrophysics, volume 419, 713-723 (2004/5-4)

A chemical analysis of five hot stars towards the Galactic Centre.

MUNN K.E., DUFTON P.L., SMARTT S.J. and HAMBLY N.C.

Abstract (from CDS):

High resolution echelle spectroscopy is presented for thirteen stars lying in the direction of the Galactic centre which, on the basis of photographic photometry and low dispersion spectroscopy, have been classified as early-B-type. Eight of these stars have large rotational velocities which preclude a detailed analysis. The five stars with moderate to low projected rotational velocities have been analysed using model atmosphere techniques to determine atmospheric parameters and chemical compositions. Two of these stars appear to be evolved blue horizontal branch objects on the basis of their chemical compositions and small projected rotational velocity. The evolutionary status of a third is ambiguous but it is probably a post-asymptotic-giant branch star. The remaining two objects are probably young massive stars and show enhanced abundances of N, C, Mg and Si, consistent with their formation in the inner part of the Galactic disk. However their O abundances are normal, confirming results found previously for other early-type stars, which would imply a flat abundance gradient for this element in the inner region of our Galaxy.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: atmospheres - stars: abundances - Galaxy: evolution - Galaxy: center - Galaxy: abundances

CDS comments: [DSH99] 456-09 is a misprint for [DSH99] 456-39.

Simbad objects: 25

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Number of rows : 25

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 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11098 1
2 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5214 1
3 BD+56 502 Be* 02 18 32.7768857886 +57 12 39.699875723 9.02 9.58 8.3904   7.9740 B1.0V 53 0
4 NGC 869 OpC 02 19 00 +57 07.7           ~ 431 0
5 NGC 884 OpC 02 22 23 +57 07.5           ~ 449 0
6 * o Ori SB* 05 21 45.7486099227 -00 22 56.910484984 3.79 4.58 4.74 4.79 4.97 B2IV 221 0
7 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 301 0
8 HD 132955 * 15 02 59.2752145072 -32 38 35.855774022 4.69 5.319 5.437     B3V 85 0
9 HD 135485 SB* 15 15 45.2572740112 -14 41 34.522358868 7.57 8.05 8.13     B3V 108 0
10 [DSH2001] 391-9 * 16 54 50.83 -34 16 10.3     13.49     ~ 2 0
11 [DSH2001] 391-23 * 16 59 18.3468807043 -33 25 35.197563523     11.98     ~ 2 0
12 [DSH99] 454-27 * 17 14 25.5786369913 -31 12 16.708718645     13.77     B 2 0
13 [DSH99] 454-10 * 17 17 38.5953199671 -28 40 57.025647943     12.21     B 2 0
14 2MASS J17390218-4500388 pA? 17 39 02.1738832633 -45 00 38.773702370     13.10     ~ 5 0
15 [DSH2001] 279-9 * 17 43 14.6410822055 -45 23 02.874547333     13.71     ~ 2 0
16 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11831 0
17 [DSH99] 393-32 * 17 48 58.4108200880 -35 18 34.642493998     12.73     B 2 0
18 LS 4431 * 17 49 11.2007128388 -19 29 50.276515623   12.8 12.60 12.52   OB+ 7 0
19 [DSH99] 393-3 * 17 49 59.9006887140 -35 32 40.741651234     12.45     B 2 0
20 TYC 8357-911-1 * 18 01 33.8175966755 -45 31 56.259514517   12.21 12.11     ~ 2 0
21 [DSH99] 456-39 * 18 05 27.0359756355 -28 18 03.920317388           B 2 0
22 [DSH2001] 591-30 * 18 39 16.8775097572 -18 01 18.069002639     13.20     ~ 2 0
23 [DSH2001] 591-5 * 18 39 35.5629288420 -19 14 10.683650174     13.32     ~ 2 0
24 LS IV -13 88 * 18 50 07.0219312003 -13 03 29.114585909 11.8 12.32 12.08 12.22   OB- 9 0
25 BD-13 5550 pA* 20 01 49.8289925402 -12 41 17.770844367 10.62 11.3 11.4     B1Ibe 72 0

    Equat.    Gal    SGal    Ecl

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2020.11.28-01:58:59

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