2017A&A...608A..13L


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.22CEST05:42:30

2017A&A...608A..13L - Astronomy and Astrophysics, volume 608A, 13-13 (2017/12-1)

A new method to unveil embedded stellar clusters.

LOMBARDI M., LADA C.J. and ALVES J.

Abstract (from CDS):

In this paper we present a novel method to identify and characterize stellar clusters deeply embedded in a dark molecular cloud. The method is based on measuring stellar surface density in wide-field infrared images using star counting techniques. It takes advantage of the differing H-band luminosity functions (HLFs) of field stars and young stellar populations and is able to statistically associate each star in an image as a member of either the background stellar population or a young stellar population projected on or near the cloud. Moreover, the technique corrects for the effects of differential extinction toward each individual star. We have tested this method against simulations as well as observations. In particular, we have applied the method to 2MASS point sources observed in the Orion A and B complexes, and the results obtained compare very well with those obtained from deep Spitzer and Chandra observations where presence of infrared excess or X-ray emission directly determines membership status for every star. Additionally, our method also identifies unobscured clusters and a low resolution version of the Orion stellar surface density map shows clearly the relatively unobscured and diffuse OB 1a and 1b sub-groups and provides useful insights on their spatial distribution.

Abstract Copyright: © ESO, 2017

Journal keyword(s): methods: statistical - ISM: clouds - open clusters and associations: general - open clusters and associations: general

Simbad objects: 25

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Number of rows : 25

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 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1131 0
2 IC 348 OpC 03 44 34 +32 09.8           ~ 1253 1
3 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 241 0
4 NAME f-Shaped Filament in Orion Cld 05 35.0 -05 30           ~ 77 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2052 1
6 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1505 1
7 M 42 HII 05 35 17.3 -05 23 28           ~ 3789 0
8 NAME LDN 1641 North HII 05 36 17.6 -06 22 10           ~ 222 0
9 [BDB2003] G210.80-19.50 Cl* 05 37 52.9 -06 57 09           ~ 3 0
10 NAME Ori A MoC 05 38 -07.1           ~ 2758 0
11 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 500 0
12 NAME LDN 1641 Center DNe 05 38 46.4 -07 01 05           ~ 52 0
13 NAME LDN 1641 South DNe 05 40 27.6 -07 27 28           ~ 50 1
14 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 581 1
15 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1218 0
16 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1087 1
17 2MASS J05422695-0809173 Y*O 05 42 26.9547504449 -08 09 17.260795359     17.208   14.617 M3.5 6 0
18 [BDB2003] G212.98-19.15 Cl* 05 42 50.1 -08 38 37           ~ 4 0
19 [BDB2003] G214.06-19.62 Cl* 05 42 53.5 -09 45 38           ~ 3 0
20 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 352 0
21 NGC 2071 RNe 05 47 10 +00 18.0           ~ 615 1
22 NGC 2112 OpC 05 53 45 +00 24.6     9.1     ~ 70 0
23 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 899 1
24 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 456 1
25 Ass Ori OB 1a As* ~ ~           ~ 204 0

    Equat.    Gal    SGal    Ecl

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2021.04.22-05:42:30

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