2019AJ....157...85B


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.04CET18:44:12

2019AJ....157...85B - Astron. J., 157, 85-85 (2019/February-0)

The CIDA Variability Survey of Orion OB1 II. Demographics of the young, low-mass stellar populations.

BRICENO C., CALVET N., HERNANDEZ J., VIVAS A.K., MATEU C., DOWNES J.J., LOERINCS J., PEREZ-BLANCO A., BERLIND P., ESPAILLAT C., ALLEN L., HARTMANN L., MATEO M. and BAILEY III J.I.

Abstract (from CDS):

We present results of our large-scale, optical, multi-epoch photometric survey across ∼180 square degrees in the Orion OB1 association, complemented with extensive follow-up spectroscopy. Our focus is mapping and characterizing the off-cloud, low-mass, pre-main-sequence (PMS) populations. We report 2062 K- and M-type confirmed T Tauri members; 59% are located in the OB1a subassociation, 27% in the OB1b subassociation, and the remaining 14% in the A and B molecular clouds. We characterize two new clusterings of T Tauri stars, the HD 35762 and HR 1833 groups, both located in OB1a not far from the 25 Ori cluster. We also identify two stellar overdensities in OB1b, containing 231 PMS stars, and find that the OB1b region is composed of two populations at different distances, possibly due to the OB1a subassociation overlapping with the front of OB1b. A ∼2 deg wide halo of young stars surrounds the Orion Nebula Cluster, corresponding in part to the low-mass populations of NGC 1977 and NGC 1980. We use the strength of Hα in emission, combined with the IR excess and optical variability, to define a new type of T Tauri star, the C/W class, stars we propose may be nearing the end of their accretion phase, in an evolutionary state between classical and weak-lined T Tauri stars. The evolution of the ensemble-wide equivalent width of Li I λ6707 indicates a Li depletion timescale of ∼8.5 Myr. Disk accretion declines with an e-folding timescale of ∼2 Myr, consistent with previous studies.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): open clusters and associations: individual: Orion OB1 association - stars: formation - stars: pre-main sequence - surveys

VizieR on-line data: <Available at CDS (J/AJ/157/85): table1.dat table2.dat table3.dat>

Nomenclature: Table 3: CVSO NNNN N=2057 among (Nos 1-2099), CVSO NNNN-N (Nos 2-1, 59-1, 170-1), CVSO NNNNWW (Nos 114SW, 114NE).

Status at CDS : Acronym for new objects described in the dictionary of nomenclature and being created in SIMBAD. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 47

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Number of rows : 47

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 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1978 1
2 IC 348 OpC 03 44 34 +32 09.8           ~ 1238 1
3 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3038 0
4 NAME Eri Bubble HI 03 52 -02.0           ~ 91 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3579 0
6 LDN 1615 DNe 05 05.5 -03 26           ~ 13 0
7 NAME HH 240/241 DNe 05 19 48.9 -05 52 05           ~ 105 1
8 NAME 25 Ori Group OpC 05 24 36 +01 48.0           ~ 96 1
9 HD 287841 Y*O 05 24 42.8031051407 +01 43 48.249517233 10.55 10.45 10.17 9.99 9.80 A8V 88 0
10 CVSO 35 TT* 05 25 45.914400 +01 45 50.11020   14.48 13.36 13.85 12.81 K7 15 0
11 CVSO 224 TT* 05 25 46.7558569125 +01 43 30.293019729     17.21 16.19 14.61 M3.5Ve 23 0
12 HD 35672 * 05 26 46.1100843521 +08 21 00.075618298   10.54 9.40     K0 2 0
13 HD 35762 * 05 27 08.3031282113 +03 51 19.984214383 5.85 6.573 6.738     B3V 55 0
14 NAME HR 1833 Cluster OpC 05 28 44 +01 37.8           ~ 30 0
15 HD 36166 V* 05 29 54.7755487007 +01 47 21.323228963 4.74 5.562 5.745     B2V 110 0
16 HD 36310 ** 05 30 57.7465360581 +04 40 07.426391083   7.93 7.95     B8IV/V 25 1
17 Kiso A-0904 1 TT* 05 31 20.6292316545 -00 49 19.847384429     14.72   13.37 K7 11 0
18 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 747 0
19 HD 36591 V* 05 32 41.3503640106 -01 35 30.577451332 4.240 5.150 5.340     B2II/III 229 1
20 HD 36646 ** 05 33 07.34558 -01 43 02.4952 5.77 6.37 6.46     B3V 71 0
21 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 238 0
22 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2021 1
23 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 268 0
24 NGC 1977 SFR 05 35 16.0 -04 49 15           ~ 188 0
25 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 491 0
26 NGC 1980 OpC 05 35 24 -05 54.9     2.5     ~ 87 0
27 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 861 0
28 CVSO 157 C* 05 37 57.9617501716 -00 47 23.647498990     17.60   15.42 C 7 0
29 NAME Ori I As* 05 38 -02.8           ~ 563 0
30 NAME Ori A MoC 05 38 -07.1           ~ 2708 0
31 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 492 0
32 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 747 0
33 LDN 1641 MoC 05 39.0 -07 00           ~ 430 0
34 Haro 5-91 Or* 05 40 24.1514398476 -00 31 21.399985654     15.48   13.04 M3 12 0
35 * zet Ori ** 05 40 45.52666 -01 56 33.2649 0.50 1.56 1.77 1.85 2.05 O9.7Ib+B0III 331 0
36 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1192 0
37 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1078 1
38 M 78 RNe 05 46 45.8 +00 04 45   8.0       ~ 345 0
39 NGC 2071 RNe 05 47 10 +00 18.0           ~ 612 1
40 NAME Monoceros SNR SNR 06 38 43 +06 30.2           ~ 217 0
41 NGC 2264 OpC 06 40 58 +09 53.7     3.9     ~ 1606 1
42 * gam02 Vel WR* 08 09 31.95013 -47 20 11.7108 0.64 1.58 1.83 1.85 2.00 WC8+O7.5III-V 848 0
43 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1149 1
44 IC 1396 OpC 21 39 00 +57 29.4           ~ 447 1
45 Ass Cep OB 2 As* 21 51 +60.0           ~ 280 0
46 NAME I Lac As* 22 41 +38.5           ~ 144 0
47 NAME Ass ORI OB 1a As* ~ ~           ~ 200 0

    Equat.    Gal    SGal    Ecl

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2020.12.04-18:44:12

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