2018A&A...609A.127S


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET21:32:49

2018A&A...609A.127S - Astronomy and Astrophysics, volume 609A, 127-127 (2018/1-1)

Star formation history of Canis Major OB1. II. A bimodal X-ray population revealed by XMM-Newton.

SANTOS-SILVA T., GREGORIO-HETEM J., MONTMERLE T., FERNANDES B. and STELZER B.

Abstract (from CDS):

Aims. The Canis Major OB1 Association has an intriguing scenario of star formation, especially in the region called Canis Major R1 (CMa R1) traditionally assigned to a reflection nebula, but in reality an ionized region. This work is focussed on the young stellar population associated with CMa R1, for which our previous results from ROSAT, optical, and near-infrared data had revealed two stellar groups with different ages, suggesting a possible mixing of populations originated from distinct star formation episodes.
Methods. The X-ray data allow the detected sources to be characterized according to hardness ratios, light curves, and spectra. Estimates of mass and age were obtained from the 2MASS catalogue and used to define a complete subsample of stellar counterparts for statistical purposes.
Results. A catalogue of 387 XMM-Newton sources is provided, of which 78% are confirmed as members or probable members of the CMa R1 association. Flares (or similar events) were observed for 13 sources and the spectra of 21 bright sources could be fitted by a thermal plasma model. Mean values of fits parameters were used to estimate X-ray luminosities. We found a minimum value of log(LX[erg/s])=29.43, indicating that our sample of low-mass stars (M*≤0.5 M), which are faint X-ray emitters, is incomplete. Among the 250 objects selected as our complete subsample (defining our "best sample"), 171 are found to the east of the cloud, near Z CMa and dense molecular gas, of which 50% of them are young (<5Myr) and 30% are older (>10Myr). The opposite happens to the west, near GU CMa, in areas lacking molecular gas: among 79 objects, 30% are young and 50% are older. These findings confirm that a first episode of distributed star formation occurred in the whole studied region ∼10Myr ago and dispersed the molecular gas, while a second, localized episode (<5Myr) took place in the regions where molecular gas is still present.

Abstract Copyright: © ESO, 2018

Journal keyword(s): X-rays: stars - stars: formation - stars: pre-main sequence - stars: low-mass

VizieR on-line data: <Available at CDS (J/A+A/609/A127): tableb1.dat tableb2.dat>

Nomenclature: Table B.1: [SGM2018] CMaX ANNN (Nos C1-C136, E1-E378, S1-S119, W1-W149).

Status in Simbad:  could be processed

Simbad objects: 33

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Number of rows : 33

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 NGC 1333 SFR 03 28 55 +31 22.2   10.9       ~ 1198 1
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2931 0
3 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2610 0
4 NAME Tau-Aur Region SFR 04 30 +25.0           ~ 1189 1
5 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3362 0
6 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1927 1
7 Cl Collinder 69 OpC 05 35 06 +09 56.0     2.8     ~ 221 0
8 M 42 HII 05 35 17.3 -05 23 28           ~ 3683 0
9 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 129 1
10 OMC 2 MoC 05 35 27 -05 10.1           ~ 375 1
11 NAME Ori I As* 05 38 -02.8           ~ 550 0
12 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1563 1
13 HD 52721 Ae* 07 01 49.50977 -11 18 03.3219 5.88 6.65 6.59 7.52   B2Vne 201 0
14 V* Z CMa Ae* 07 03 43.1588002461 -11 33 06.230351311 10.51 9.99 8.80     B5/8eq+F5/7 525 3
15 VDB 92 RNe 07 03 55 -11 34.5           ~ 7 1
16 IRAS 07016-1118 Cld 07 03 58.7 -11 23 19           ~ 22 0
17 LBN 1033 HII 07 05.9 -11 13           ~ 41 1
18 NAME CMa OB1 As* 07 07.0 -10 28           ~ 119 0
19 NAME CMa R1 As* 07 08 21.3 -11 04 50           ~ 75 1
20 NGC 2362 OpC 07 18 41 -24 57.3     4.1     ~ 358 0
21 NGC 2367 OpC 07 20 06 -21 52.9   7.98 7.9     ~ 59 0
22 NGC 2645 OpC 08 39 03 -46 14.0   7.51 7.32     ~ 55 0
23 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 875 2
24 NGC 3572 OpC 11 10 23 -60 14.9   6.82 6.6     ~ 74 0
25 NGC 3590 OpC 11 12 59 -60 47.3   8.50 8.2     ~ 69 2
26 C 1110-586 OpC 11 13 05 -58 53.0   7.02 7.0     ~ 42 0
27 NAME Cha Dark Cloud SFR 11 55 -78.0           ~ 536 1
28 Cl Stock 16 OpC 13 19 29 -62 38.0   9.64 9.1     ~ 82 0
29 NGC 6178 OpC 16 35 47 -45 38.6   7.28 7.2     ~ 58 0
30 Cl Lynga 14 OpC 16 55 00 -45 14.4   10.85 9.7     ~ 37 0
31 NAME the Pipe Nebula DNe 17 30 -25.0           ~ 325 1
32 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 925 2
33 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 894 2

    Equat.    Gal    SGal    Ecl

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2020.01.29-21:32:49

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