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

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

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