2013ApJ...777L...1F

Query : 2013ApJ...777L...1F

2013ApJ...777L...1F - Astrophys. J., 777, L1 (2013/November-1)

The open cluster chemical analysis and mapping survey: local galactic metallicity gradient with APOGEE using SDSS DR10.

FRINCHABOY P.M., THOMPSON B., JACKSON K.M., O'CONNELL J., MEYER B., ZASOWSKI G., MAJEWSKI S.R., CHOJNOWKSI S.D., JOHNSON J.A., ALLENDE PRIETO C., BEERS T.C., BIZYAEV D., BREWINGTON H., CUNHA K., EBELKE G., GARCIA PEREZ A.E., HEARTY F.R., HOLTZMAN J., KINEMUCHI K., MALANUSHENKO E., MALANUSHENKO V., MARCHANTE M., MESZAROS S., MUNA D., NIDEVER D.L., ORAVETZ D., PAN K., SCHIAVON R.P., SCHNEIDER D.P., SHETRONE M., SIMMONS A., SNEDDEN S., SMITH V.V. and WILSON J.C.

Abstract (from CDS):

The Open Cluster Chemical Analysis and Mapping (OCCAM) survey aims to produce a comprehensive, uniform, infrared-based data set for hundreds of open clusters, and constrain key Galactic dynamical and chemical parameters from this sample. This first contribution from the OCCAM survey presents analysis of 141 members stars in 28 open clusters with high-resolution metallicities derived from a large uniform sample collected as part of the Sloan Digital Sky Survey III/Apache Point Observatory Galactic Evolution Experiment. This sample includes the first high-resolution metallicity measurements for 22 open clusters. With this largest ever uniformly observed sample of open cluster stars we investigate the Galactic disk gradients of both [M/H] and [α/M]. We find basically no gradient in [α/M] across 7.9 kpc ≤ R_GC ≤ 14.5 kpc, but [M/H] does show a gradient for R_GC< 10 kpc and a significant flattening beyond R_GC= 10 kpc. In particular, whereas fitting a single linear trend yields an [M/H] gradient of -0.09±0.03 dex/kpc–similar to previously measure gradients inside 13 kpc–by independently fitting inside and outside 10 kpc separately we find a significantly steeper gradient near the Sun (7.9 ≤ R_GC ≤ 10) than previously found (-0.20±0.08 dex/kpc) and a nearly flat trend beyond 10 kpc (-0.02±0.09 dex/kpc).

Abstract Copyright: ∼

Journal keyword(s): Galaxy: abundances - Galaxy: disk - Galaxy: evolution - open clusters and associations: general

Simbad objects: 30

Full paper

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Number of rows : 30

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Sp type	#ref 1850 - 2026	#notes
1	[FSR2007] 0498	OpC	00 29 16.8	+62 23 40			~	23	0
2	NGC 136	OpC	00 31 35.1	+61 30 27			~	43	0
3	[FSR2007] 0542	OpC	01 25 49.5	+63 01 30			~	29	0
4	Cl King 5	OpC	03 14 43.6	+52 41 52			~	84	0
5	Cl King 7	OpC	03 59 08.0	+51 47 11			~	74	0
6	[FSR2007] 0660	OpC	04 02 38.0	+51 55 56			~	9	0
7	[KPR2005] 14	OpC	05 20 31	+35 13.2			~	20	0
8	[KPR2005] 15	OpC	05 22.6	+36 33			~	15	0
9	M 38	OpC	05 28 40.0	+35 49 08	6.69	6.4	~	184	2
10	[FSR2007] 0821	OpC	05 41 53.0	+29 54 17			~	15	0
11	[FSR2007] 0942	OpC	06 05 58.6	+13 40 15			~	34	0
12	NGC 2158	OpC	06 07 26.7	+24 05 53			~	317	0
13	[FSR2007] 0941	OpC	06 21 47.3	+15 46 09			~	29	0
14	NGC 2234	OpC	06 29 20	+16 45.5			~	16	0
15	NGC 2240	OpC	06 33 10	+35 15.0			~	27	1
16	Cl Collinder 106	OpC	06 37 02.6	+05 59 54		4.6	~	55	0
17	Cl Berkeley 29	OpC	06 53 03.6	+16 55 24	14.3		~	187	0
18	NAME Saurer A Cluster	OpC	07 20.9	+01 48			~	70	0
19	NGC 2420	OpC	07 38 24.6	+21 34 26	9.0	8.3	~	523	0
20	NGC 2682	OpC	08 51 23.5	+11 48 54			~	2528	0
21	NGC 6791	OpC	19 20 52.8	+37 46 40	10.52	9.5	~	1120	0
22	NGC 6811	OpC	19 37 21.8	+46 22 43	7.47	6.8	~	435	0
23	NGC 6819	OpC	19 41 18.3	+40 11 19	8.21	7.3	~	719	0
24	DSH J1947.7+2415	OpC	19 47 42.7	+24 16 23			~	21	0
25	Cl Berkeley 53	OpC	20 55 54.8	+51 03 30			~	43	0
26	Cl Berkeley 91	OpC	21 10 51.0	+48 32 45			~	31	0
27	IC 1369	OpC	21 12 07.2	+47 46 24	9.79	8.8	~	58	0
28	NGC 7062	OpC	21 23 25.8	+46 22 46	8.99	8.3	~	103	0
29	NGC 7093	OpC	21 34 21.0	+45 57 54			~	11	0
30	NGC 7789	OpC	23 57 19.4	+56 43 28	7.68	6.7	~	575	0

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