2017A&A...598A.124K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:20:54

2017A&A...598A.124K - Astronomy and Astrophysics, volume 598A, 124-124 (2017/2-1)

Orion revisited. III. The Orion Belt population.

KUBIAK K., ALVES J., BOUY H., SARRO L.M., ASCENSO J., BURKERT A., FORBRICH J., GROSSSCHEDL J., HACAR A., HASENBERGER B., LOMBARDI M., MEINGAST S., KOHLER R. and TEIXEIRA P.S.

Abstract (from CDS):

Aims. This paper continues our study of the foreground population to the Orion molecular clouds. The goal is to characterize the foreground population north of NGC 1981 and to investigate the star formation history in the large Orion star-forming region. We focus on a region covering about 25 square degrees, centered on the ε Orionis supergiant (HD 37128, B0 Ia) and covering the Orion Belt asterism.
Methods. We used a combination of optical (SDSS) and near-infrared (2MASS) data, informed by X-ray (XMM-Newton) and mid-infrared (WISE) data, to construct a suite of color-color and color-magnitude diagrams for all available sources. We then applied a new statistical multiband technique to isolate a previously unknown stellar population in this region.
Results. We identify a rich and well-defined stellar population in the surveyed region that has about 2000 objects that are mostly M stars. We infer the age for this new population to be at least 5Myr and likely ∼10Myr and estimate a total of about 2500 members, assuming a normal IMF. This new population, which we call the Orion Belt population, is essentially extinction-free, disk-free, and its spatial distribution is roughly centered near ε Ori, although substructure is clearly present.
Conclusions. The Orion Belt population is likely the low-mass counterpart to the Ori OB Ib subgroup. Although our results do not rule out Blaauw's sequential star formation scenario for Orion, we argue that the recently proposed blue streams scenario provides a better framework on which one can explain the Orion star formation region as a whole. We speculate that the Orion Belt population could represent the evolved counterpart of an Orion nebula-like cluster.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: formation - stars: late-type - stars: pre-main sequence - ISM: clouds - globular clusters: general

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Kiso A-0903 163 Em* 05 28 39.6683194007 -00 03 22.603036555     18.0     M4V 3 0
2 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 742 0
3 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 235 0
4 Kiso A-0904 21 Y*O 05 34 17.1445091010 -01 09 34.893495835     16.3     ~ 4 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
6 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 227 0
7 NGC 1981 OpC 05 35 09 -04 25.9     4.2     ~ 71 0
8 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1015 2
9 NGC 1977 SFR 05 35 16.0 -04 49 15           ~ 185 0
10 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1467 1
11 M 42 HII 05 35 17.3 -05 23 28           ~ 3724 0
12 NAME Ori Complex Cld 05 35.3 -05 23           ~ 334 0
13 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 219 1
14 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 129 1
15 NGC 1980 OpC 05 35 24 -05 54.9     2.5     ~ 86 0
16 OMC 2 MoC 05 35 27 -05 10.1           ~ 383 1
17 Cl Collinder 70 OpC 05 35 30 -01 06.0           ~ 57 0
18 M 43 HII 05 35 31 -05 16.2           ~ 160 0
19 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 856 0
20 GSH 206-17+13 sh 05 37 -02.1           ~ 6 0
21 NAME Ori A MoC 05 38 -07.1           ~ 2675 0
22 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 486 0
23 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 738 0
24 * zet Ori ** 05 40 45.52666 -01 56 33.2649   1.59 1.79     O9.7Ib+B0III 329 0
25 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
26 IC 434 HII 05 41 -02.5           ~ 75 1
27 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 692 1
28 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1164 0
29 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1071 1
30 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
31 Ass Ori OB 1a As* ~ ~           ~ 195 0
32 NAME Ori Belt reg ~ ~           ~ 65 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:20:54

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