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

Query : 1994A&A...289..740K

1994A&A...289..740K - Astronomy and Astrophysics, volume 289740-748 (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

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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 - 2026 		#notes
1 BD+56 502 Be* 02 18 32.7771648600 +57 12 39.684099204 9.02 9.58 8.3904   7.9740 B1.0V 62 0
2 BD+56 504 * 02 18 40.3146930864 +57 06 03.140719164 9.17 9.611 8.4735   8.0657 B1.5III 41 0
3 Cl* Waterloo 1 MFJ 6 * 04 18 39.5059766568 +52 50 55.048178377 12.97 13.28 12.65     B1.5V 18 0
4 Cl Waterloo 1 OpC 04 18 45.9 +52 51 55           ~ 85 0
5 LS V +47 24 * 04 58 45.3395087376 +47 59 56.121044280 11.14 11.74 11.32     O9.5V 29 0
6 LBN 159.17+03.33 HII 04 58 45.7 +47 59 36           ~ 86 1
7 HD 34989 * 05 21 43.5623819760 +08 25 42.799279584 4.79 5.67 5.80 5.79 5.92 B1V 158 1
8 * o Ori SB* 05 21 45.7473567408 -00 22 56.880734196 3.79 4.58 4.74 4.79 4.97 B2IV 246 0
9 LS V +33 24 * 05 23 12.8415126016 +33 18 55.182577703 11.02 11.48 11.05     B0.5V 25 0
10 HD 243018 Y*O 05 23 19.4679259186 +33 27 08.034444544 10.38 11.1 11.0     B0.2V 33 1
11 * n01 Ori ** 05 31 14.53183 +03 17 31.6729 4.47 5.29 5.46 5.51 5.72 B3II/III 142 0
12 HD 36959 Y*O 05 35 01.0070120496 -06 00 33.366713364 4.52 5.33 5.53     B1V 223 0
13 HD 36960 * 05 35 02.6823091513 -06 00 07.308349203 3.52 4.50 4.72     B0.5V 283 0
14 LBN 189.02+00.91 HII 06 08 23 +21 35.3           ~ 73 0
15 LS V +21 27 V* 06 08 32.1164513496 +21 36 39.234963240 11.24 11.4 11.0 10.89   O9.5IV 35 0
16 SH 2-301 HII 07 09 54.3 -18 29 53           ~ 51 0
17 TYC 5968-2262-1 * 07 09 55.5364215816 -18 26 08.157974244 11.04 11.77 11.54 11.61   OB 13 0
18 HD 164844 Y*? 18 04 02.9277541608 -22 33 57.437896572 7.49 8.93 8.89 9.20   B1/2III 49 0
19 LS II +23 28 * 19 43 23.0561446728 +23 12 38.884775220 12.31 12.24 11.52 11.59   B 29 0
20 HD 194194 * 20 22 44.7595785696 +40 42 52.637679684 7.39 8.16 8.13     B2III 57 0

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