2014ApJ...787..108G

Query : 2014ApJ...787..108G

2014ApJ...787..108G - Astrophys. J., 787, 108 (2014/June-1)

Age gradients in the stellar populations of massive star forming regions based on a new stellar chronometer.

GETMAN K.V., FEIGELSON E.D., KUHN M.A., BROOS P.S., TOWNSLEY L.K., NAYLOR T., POVICH M.S., LUHMAN K.L. and GARMIRE G.P.

Abstract (from CDS):

A major impediment to understanding star formation in massive star-forming regions (MSFRs) is the absence of a reliable stellar chronometer to unravel their complex star formation histories. We present a new estimation of stellar ages using a new method that employs near-infrared (NIR) and X-ray photometry, AgeJX. Stellar masses are derived from X-ray luminosities using the LX-M relation from the Taurus cloud. J-band luminosities are compared to mass-dependent pre-main-sequence (PMS) evolutionary models to estimate ages. AgeJX is sensitive to a wide range of evolutionary stages, from disk-bearing stars embedded in a cloud to widely dispersed older PMS stars. The Massive Young Star-Forming Complex Study in Infrared and X-ray (MYStIX) project characterizes 20 OB-dominated MSFRs using X-ray, mid-infrared, and NIR catalogs. The AgeJXmethod has been applied to 5525 out of 31,784 MYStIX Probable Complex Members. We provide a homogeneous set of median ages for over 100 subclusters in 15 MSFRs; median subcluster ages range between 0.5 Myr and 5 Myr. The important science result is the discovery of age gradients across MYStIX regions. The wide MSFR age distribution appears as spatially segregated structures with different ages. The AgeJX ages are youngest in obscured locations in molecular clouds, intermediate in revealed stellar clusters, and oldest in distributed populations. The NIR color index J - H, a surrogate measure of extinction, can serve as an approximate age predictor for young embedded clusters.

Abstract Copyright: ∼

Journal keyword(s): infrared: stars - open clusters and associations: general - stars: early-type - stars: formation - stars: pre-main sequence - X-rays: stars

VizieR on-line data: <Available at CDS (J/ApJ/787/108): table1.dat table2.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 58

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Number of rows : 58
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 NAME M17 EB bub 01 01.6 -00 45           ~ 9 0
2 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
3 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
4 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
6 NGC 1893 OpC 05 22 52.8 +33 26 32           ~ 270 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
8 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1249 2
9 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2421 1
10 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
11 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
12 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
13 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 715 1
14 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1498 0
15 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
16 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
17 NGC 2237 Cl* 06 30 36.10 +04 58 50.6           ~ 75 2
18 NGC 2244 OpC 06 32 06.9 +04 54 19           ~ 673 1
19 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 522 1
20 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 277 0
21 NAME Mon I MoC 06 35 +10.1           ~ 268 0
22 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
23 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.45 4.68   4.88 O7V+B1.5/2V 823 0
24 IRAS 06382+0939 Y*O 06 41 02.81160 +09 36 16.1712         19.89 ~ 93 0
25 RAFGL 989 Y*O 06 41 10.1587451112 +09 29 33.635220144   17.4 16.8 18.26 17.28 B2 271 0
26 NGC 2362 OpC 07 18 41.9 -24 57 08           ~ 428 0
27 NAME Vela C Cld 08 57 -43.2           ~ 193 0
28 RCW 36 HII 08 59 00.9 -43 44 10     15.20     ~ 161 0
29 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 327 2
30 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
31 Cl Collinder 232 OpC 10 44 39.00 -59 33 36.0           ~ 72 0
32 Cl Trumpler 15 OpC 10 44 43.6 -59 22 07           ~ 229 0
33 Cl Trumpler 16 OpC 10 45 01.9 -59 42 00           ~ 510 0
34 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1071 2
35 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
36 NAME Treasure Chest Cluster Cl* 10 45 54.0 -59 56 58           ~ 30 1
37 NGC 3576 HII 11 11 53.2 -61 18 26           ~ 245 2
38 NGC 6634 ? 17 20 50 -35 47.0           ~ 11 0
39 NGC 6334 HII 17 20 53 -36 07.9           ~ 740 0
40 Cl Pismis 24 OpC 17 24 43.0 -34 12 23           ~ 130 0
41 NGC 6357 OpC 17 24 44 -34 12.2           ~ 303 0
42 [ABB2014] WISE G353.092+00.857 bub 17 24 47.6 -34 16 13           ~ 11 0
43 [CWP2007] CS 63 bub 17 25 30 -34 26.7           ~ 6 0
44 [CWP2007] CS 59 bub 17 26 13 -34 16.8           ~ 8 0
45 M 20 OpC 18 02 42 -22 58.3           ~ 456 1
46 M 8 OpC 18 03 37 -24 23.2           ~ 644 1
47 NAME Hourglass Nebula ISM 18 03 41.1 -24 22 37           ~ 79 2
48 NGC 6530 OpC 18 04 31 -24 21.5           ~ 443 0
49 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
50 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 281 0
51 NAME M 17 North MoC 18 20 40.19 -16 09 29.0           ~ 50 0
52 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
53 TGU H279 P7 DNe 18 30.7 -02 00           ~ 9 0
54 LBN 028.77+03.43 HII 18 31 26.5 -02 04 22           ~ 255 2
55 NAME Aql Rift DNe 18 32 -01.0           ~ 355 1
56 NAME Cyg X Cld 20 30 04.7973633 +40 51 36.002197           ~ 962 1
57 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
58 NAME Ass Cep OB 3b As* 22 55 31.19 +62 38 54.1           ~ 53 0

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