2006AJ....131.2959M

Query : 2006AJ....131.2959M

2006AJ....131.2959M - Astron. J., 131, 2959-2966 (2006/June-0)

The southern flanking fields of the 25 Orionis group.

McGEHEE P.M.

Abstract (from CDS):

The stellar group surrounding the Be (B1 Vpe) star 25 Ori was discovered to be a pre-main-sequence (PMS) population by the CIDA Variability Survey of Orion and subsequent spectroscopy. We analyze Sloan Digital Sky Survey multiepoch photometry to map the southern extent of the 25 Ori group and characterize its PMS population. We compare this group to the neighboring Orion OB1a and OB1b subassociations and to active star formation sites (NGC 2068/NGC 2071) within the LDN 1630 dark cloud. We find that the 25 Ori group has a radius of 1°.4, corresponding to 8-11 pc at the distances of Orion OB1a and OB1b. Given that the characteristic sizes of young open clusters are a few parsecs or less, this suggests that 25 Ori is an unbound association rather than an open cluster. Due to its PMS population having a low classical T Tauri star fraction (∼10%), we conclude that the 25 Ori group is of comparable age to the 11 Myr Orion OB1a subassociation.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (25 Orionis) - Stars: Formation - Stars: Late-Type - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

VizieR on-line data: <Available at CDS (J/AJ/131/2959): table2.dat>

Nomenclature: Table 2: [M2006] SDSS JHHMMSS.ss+DDMMSS.s N=506.

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

CDS comments: Table 2: objects designated by authors as 'low galactic latitude SDSS JHHMMSS.ss+DDMMSS.s' are not in the SDSS catalog.

Simbad objects: 20

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Number of rows : 20
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 CVSO 1 TT* 05 10 58.7815624224 -00 08 03.107147244     17.30   14.61 M3 6 0
2 CVSO 13 TT* 05 22 42.8214162552 -00 53 06.565469352     16.03   13.79 M2 14 0
3 * psi01 Ori Be* 05 24 44.8273848312 +01 50 47.201915688 3.83 4.76 4.96 5.04 5.26 B1Vn 372 0
4 NAME 25 Ori Group OpC 05 24 50.9 +01 41 38           ~ 195 1
5 CVSO 49 TT* 05 28 06.9150484464 -00 18 06.003435924     17.72   15.23 M3 8 0
6 CVSO 81 TT* 05 30 55.6192116144 -00 55 40.044698004   17.615 16.485 15.918 13.46 M3 21 0
7 CVSO 124 TT* 05 33 49.0447493376 -00 46 25.931306892     15.71 14.87 13.34 M3 16 0
8 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 281 0
9 CVSO 142 TT* 05 35 30.0296729496 -00 28 22.739399472     15.83   13.58 M2 11 0
10 CVSO 156 TT* 05 37 47.0186347752 -00 20 07.230321672     16.01   13.73 M2 16 0
11 Kiso A-0904 65 C* 05 37 57.9619745136 -00 47 23.643897576     17.60   15.42 Ce 14 0
12 CVSO 162 TT* 05 38 30.8474860176 -01 10 24.308513940     15.65   13.75 M1 21 0
13 Kiso A-0904 73 TT* 05 38 53.8504153392 -00 49 20.039452608     16.44   13.42 M3 14 0
14 CVSO 168 TT* 05 39 04.2991591944 -00 38 09.986144568     17.11   14.27 M4 9 0
15 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 555 0
16 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1198 1
17 LDN 1630 DNe 05 45.5 -00 59           ~ 392 0
18 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 397 0
19 NGC 2071 RNe 05 47 10 +00 18.0           ~ 661 1
20 Ass Ori OB 1a As* ~ ~           ~ 237 0

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