2018A&A...617A..63P


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST00:52:23

2018A&A...617A..63P - Astronomy and Astrophysics, volume 617A, 63-63 (2018/9-1)

Low-mass star formation and subclustering in the H II regions RCW 32, 33, and 27 of the Vela Molecular Ridge. A photometric diagnostics for identifying M-type stars.

PRISINZANO L., DAMIANI F., GUARCELLO M.G., MICELA G., SCIORTINO S., TOGNELLI E. and VENUTI L.

Abstract (from CDS):


Context. Most stars are born in clusters, and recent results suggest that star formation (SF) preferentially occurs in subclusters. Studying the morphology and SF history of young clusters is crucial for understanding early cluster formation processes.
Aims. We aim to identify the embedded population of young stellar objects (YSOs) down to the low-mass stars in the M-type regime in the three HII regions RCW 33, RCW 32, and RCW 27, which are located in the northwestern region of the Vela Molecular Ridge. Our aim is to characterize their properties, such as morphology and extent of the clusters in the three HII regions, derive stellar ages, and determine the connection of the SF history with the environment.
Methods. Through public photometric surveys such as Gaia, VPHAS+, 2MASS, and Spitzer/GLIMPSE, we identify YSOs with classical techniques aimed at detecting IR, Hα, and UV excesses as signatures of circumstellar disks and accretion. In addition, we implement a method for distinguishing main-sequence (MS) stars and giants in the M-type regime by comparing the reddening derived in several optical/IR color-color diagrams, assuming suitable theoretical models. Since this diagnostic is sensitive to stellar gravity, the procedure allows us to also identify pre-MS (PMS) stars.
Results. Using the classical membership criteria, we find that a large population of YSOs shows signatures of circumstellar disks with or without accretion. In addition, with the new technique of M-type star selection, we find a rich population of young M-type stars whose spatial distribution strongly correlates with the more massive population. We find evidence of three young clusters, with different morphology, for which we estimate the individual distances using TGAS Gaia data of the brighter subsample. In addition, we identify field stars falling in the same region by securely classifying them as giants and foreground MS stars.
Conclusions. We identify the embedded population of YSOs down to about 0.1M that is associated with the three HII regions RCW 33, RCW 32, and RCW 27 and the three clusters Vela T2, Cr 197, and Vela T1, respectively. All the three clusters are located at a similar distance, but they have very different morphologies. Our results suggest a decreasing SF rate in Vela T2 and triggered SF in Cr 197 and Vela T1.

Abstract Copyright: © ESO 2018

Journal keyword(s): techniques: photometric - stars: low-mass - stars: pre-main sequence - stars: formation - H II regions - open clusters and associations: general

VizieR on-line data: <Available at CDS (J/A+A/617/A63): table2.dat table3.dat>

Status at CDS:   being processed
// All or part of tables of objects will be ingested in SIMBAD with priority 1.

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 - 2020
#notes
1 NAME GUM Nebula ISM 07 43 -42.1           ~ 386 1
2 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1099 2
3 NGC 2626 RNe 08 35 32 -40 40.3           ~ 31 2
4 BRAN 166 HII 08 38 08.0 -40 17 53           ~ 27 1
5 NAME Vela-D Molecular Cloud MoC 08 39 -41.0           ~ 43 0
6 HD 73882 EB* 08 39 09.53412 -40 25 09.2608 7.07 7.59 7.19 6.67 6.30 O8.5IV 217 2
7 MSX6C G260.7658+00.6604 Cld 08 41 13.0 -40 52 03           ~ 7 1
8 SFO 56 Cld 08 42 59.5 -39 59 56           ~ 6 1
9 GUM 15 HII 08 43 52.5 -41 14 39           ~ 31 2
10 SFO 57 Cld 08 44 07.7 -41 16 14           ~ 7 1
11 HD 74804 * 08 44 40.3241311249 -41 16 37.968841575 7.13 9.26 8.84 8.31 9.41 B3/5II 53 1
12 ESO 313-13 OpC 08 44 51 -41 14.0   7.01 6.7     ~ 54 0
13 SFO 58 Cld 08 45 25.4 -41 16 02           ~ 9 1
14 Cl Trumpler 10 OpC 08 47 54 -42 27.0           ~ 145 0
15 HD 75724 * 08 50 05.4510856230 -42 06 23.604991747 6.88 7.619 7.682 8.56   B2III 25 0
16 [KPR2005] 50 OpC 08 50 17 -41 43.2           ~ 20 0
17 HD 75759 SB* 08 50 21.0168784693 -42 05 23.246151531 4.95 5.90 6.00 7.18   O9V+B0V 125 0
18 GRS G263.00 +01.40 HII 08 51.3 -42 05           ~ 15 0
19 NAME VELA MOL RIDGE MoC 08 53 -45.0           ~ 133 0
20 NAME Vela C Cld 08 57 -43.2           ~ 122 0
21 RCW 36 HII 08 59 00.9 -43 44 10     15.20     ~ 125 0
22 NAME Vela A MoC 09 18 -48.0           ~ 26 0
23 GUM 29 HII 10 24 14.6 -57 46 58           ~ 191 0
24 NAME Vela T2 As* ~ ~           ~ 2 0
25 NAME Vela T1 As* ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-00:52:23

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