1994A&A...289..740K


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST14:20:34

1994A&A...289..740K - Astronomy and Astrophysics, volume 289, 740-748 (1994/9-3)

The galactic abundance gradients traced by B-type stars.

KAUFER A., SZEIFERT T., KRENZIN R., BASCHEK B. and WOLF B.

Abstract (from CDS):

We obtained high S/N, high resolution spectra of 16 B-type main sequence stars in young open clusters and in HII regions with galactocentric distances between 7 and 16 kpc. Chemical abundances for this sample were derived using line-blanketed LTE model atmospheres and line formation in LTE. Our analyses together with published data from similar analyses of B-type stars result in flat gradients or even no gradients at all for oxygen and nitrogen in the outer part of the galactic disk. It is conjectured that the larger metallicity gradients cited for HII regions are essentially due to a steepening within the inner 6 kpc towards the galactic center.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/289/740): table2 table6 table7 table8 tables.tex>

Simbad objects: 20

goto View the reference in ADS

Number of rows : 20

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 BD+56 502 Be* 02 18 32.7768857886 +57 12 39.699875723 9.02 9.58 8.3904   7.9740 B1.0V 53 0
2 BD+56 504 * 02 18 40.3142601020 +57 06 03.140504483 9.17 9.611 8.4735   8.0657 B1.5III 33 0
3 Cl* Waterloo 1 MFJ 6 * 04 18 39.5058760156 +52 50 55.047152363 12.97 13.28 12.65     B1.5V 12 0
4 GSC 03719-00517 OpC 04 19 32.92 +52 58 41.6           ~ 56 0
5 LS V +47 24 * 04 58 45.3394503258 +47 59 56.122840372 11.14 11.74 11.32     O9.5V 26 0
6 LBN 159.17+03.33 HII 04 58 45.70 +47 59 36.0           ~ 79 2
7 HD 34989 * 05 21 43.5619157417 +08 25 42.841350828 4.79 5.67 5.80 5.79 5.92 B1V 143 1
8 * o Ori SB* 05 21 45.7486099227 -00 22 56.910484984 3.79 4.58 4.74 4.79 4.97 B2IV 222 0
9 LS V +33 24 * 05 23 12.8416891489 +33 18 55.182718047 11.02 11.48 11.05     B0.5V 21 0
10 HD 243018 Y*O 05 23 19.4685531524 +33 27 08.035107504 10.38 11.1 11.0     B0.2V 27 1
11 * n01 Ori ** 05 31 14.53183 +03 17 31.6729 4.47 5.29 5.46 5.51 5.72 B3II/III 130 0
12 HD 36959 Y*O 05 35 01.0063388388 -06 00 33.371107627 4.52 5.33 5.53     B1.2 195 0
13 HD 36960 * 05 35 02.6807398 -06 00 07.303539 3.52 4.50 4.72     B1/2Ib/II 248 0
14 LBN 189.02+00.91 HII 06 08 23 +21 35.3           ~ 65 0
15 LS V +21 27 V* 06 08 32.1165465652 +21 36 39.235693184 11.24 11.4 11.0 10.89   O9.5IV 26 0
16 SH 2-301 HII 07 09 54.3 -18 29 53           ~ 47 0
17 TYC 5968-2262-1 * 07 09 55.5365308008 -18 26 08.155327478 11.04 11.77 11.54 11.61   OB 10 0
18 HD 164844 * 18 04 02.9277657971 -22 33 57.441080458 7.49 8.93 8.89 9.20   B1/2III 35 0
19 LS II +23 28 * 19 43 23.0561111392 +23 12 38.883998743 12.31 12.24 11.52 11.59   B 23 0
20 HD 194194 * 20 22 44.7593800539 +40 42 52.635520187 7.39 8.16 8.13     B2III 47 0

    Equat.    Gal    SGal    Ecl

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