2010A&A...514A..18C


Query : 2010A&A...514A..18C

2010A&A...514A..18C - Astronomy and Astrophysics, volume 514, A18-18 (2010/5-1)

Stars and brown dwarfs in the σ Orionis cluster. II. A proper motion study.

CABALLERO J.A.

Abstract (from CDS):

I attempt to fully understand the origin of the stellar and substellar populations in the young σ Orionis open cluster, which is a benchmark for star-forming studies. Because of the very low proper motion of the cluster, late-type dwarfs with appreciable proper motion in the foreground of σ Orionis can be easily discarded as targets from expensive spectroscopic follow-up studies.I use the Aladin sky atlas, USNO-B1, public astrometric catalogues, and photographic plate digitisations to identify stars with proper motions that are inconsistent with cluster membership in a circular area of radius 30arcmin centred on the early-type multiple system σ Ori. Primarily because of the long time baseline of more than half a century, the errors in the measured proper motions are lower than 2mas/a. Of the 42 stars selected for astrometric follow-up, 37 of them are proper-motion cluster interlopers. Some USNO-B1 measurements were affected by partially resolved (visual) multiplicity and target faintness. Because of their late spectral types and, hence, red colours, 24 contaminants had been considered at some point as σ Orionis members. I discuss how contamination may have affected previous work (especially related to disc frequencies) and the curious presence of lithium absorption in three M-dwarf proper motion contaminants. Finally, I classify the bright star HD 294297 as a late-F field dwarf unrelated to the cluster based on a new proper motion measurement.Although proper motions cannot be used to confirm membership in σ Orionis, they can be instead used to discard a number of cluster member candidates without spectroscopy.

Abstract Copyright:

Journal keyword(s): astronomical databases: miscellaneous - stars: late-type - open clusters and associations: individual: σ Orionis - proper motions

Nomenclature: Tables A.1-A.2: [C2010] NN (Nos 1-42).

Simbad objects: 78

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Number of rows : 78
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3282 0
2 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 258 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2210 1
4 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 551 0
5 2MASS J05365466-0232069 * 05 36 54.6685027608 -02 32 06.998636580           ~ 2 0
6 UCAC2 30799871 * 05 36 58.7912830608 -02 49 09.106764132         14.41 ~ 1 0
7 USNO-B1.0 0874-00102977 PM* 05 37 01.7317817976 -02 32 39.347751768   20.3   18.6 16.90 ~ 1 0
8 2MASS J05370500-0241036 Y*O 05 37 05.0026631904 -02 41 03.673312404   19.86 18.30 17.10 15.68 ~ 2 0
9 TYC 4770-924-1 * 05 37 19.2243150024 -02 28 46.218659880   13.14 12.28   11.36 ~ 7 0
10 HD 294276 PM* 05 37 20.6760809160 -02 49 33.129302592   11.03 10.34     G4 10 0
11 [LC2008] NX 11 * 05 37 22.7833722408 -02 32 42.967690584           ~ 2 0
12 2MASS J05372306-0232465 Y*O 05 37 23.0637166944 -02 32 46.577105952   19.97 18.42 17.18 15.65 M3.0 7 0
13 2MASS J05372495-0228371 Y*O 05 37 24.9598835856 -02 28 37.120211112     15.04 14.28 13.80 K5.0 5 0
14 2MASS J05372522-0216047 Y*O 05 37 25.2245415456 -02 16 04.819940508   19.40 17.82 16.59 15.12 ~ 3 0
15 UCAC4 439-010743 Y*O 05 37 26.9329096152 -02 21 54.131716404   14.93 13.73 13.39   K5.0 6 0
16 [HHM2007] 61 PM* 05 37 28.6371997392 -02 46 46.887490956     18.97 17.84   ~ 4 0
17 G 99-20 Y*O 05 37 31.0632747480 -02 31 43.936219164   15.3 14.05 12.9   M2.5 11 0
18 [HHM2007] 120 * 05 37 37.62 -02 25 44.0           ~ 2 0
19 [C2010] 2 PM* 05 37 42.1663010760 -03 01 31.503979200         16.09 ~ 2 0
20 [BZR99] S Ori 23 Y*O 05 37 51.1108853952 -02 26 07.501486812   20.6   19.4 16.88 M6.5 14 0
21 USNO-B1.0 0873-00105721 * 05 37 53.3334514680 -02 36 08.949333852         15.86 ~ 1 0
22 2MASS J05375647-0243574 Y*O 05 37 56.4763785456 -02 43 57.473506308   18.22 16.78 15.67 14.34 M2.5 7 0
23 HD 294269 SB* 05 37 57.8184793920 -02 26 33.561791664   11.40 10.74     ~ 21 0
24 [BNM2013] 93.03 85 LM* 05 38 05.6708045736 -02 40 19.487522352   17.96 16.43 15.34 14.07 M2.5 12 0
25 USNO-B1.0 0872-00106494 PM* 05 38 07.9279271832 -02 45 08.976414744         16.84 ~ 1 0
26 UCAC3 174-24848 * 05 38 09.4168244904 -03 00 12.086176536         15.35 ~ 1 0
27 [BZR99] S Ori 70 BD* 05 38 10.10 -02 36 26.0           T6-7 46 0
28 2MASS J05381033-0213596 PM* 05 38 10.3529014085 -02 13 59.741099915   18.1 17.73 16.63 14.50 ~ 7 0
29 USNO-A2.0 0825-01615246 * 05 38 14.0420991528 -02 10 18.819080292   19.7   18.8   ~ 1 1
30 2MASS J05381453-0210152 Y*O 05 38 14.5374443280 -02 10 15.292452720   18.22 16.75 15.50 13.98 ~ 7 1
31 2MASS J05381906-0232014 * 05 38 19.0657697328 -02 32 01.432834296 17.133 15.25 14.10 13.40 12.81 ~ 7 0
32 2MASS J05382280-0303526 * 05 38 22.8010452360 -03 03 52.776595080         15.91 ~ 1 0
33 [HHM2007] 481 * 05 38 22.8310710048 -02 45 30.505611132     18.23 17.30 15.68 ~ 4 0
34 UCAC4 440-010986 Y*O 05 38 25.493448 -02 10 23.05632   17.46 15.76 15.41 13.45 ~ 8 0
35 [HHM2007] 527 * 05 38 27.8682076776 -02 41 59.452932300           ~ 2 0
36 [HHM2007] 544 PM* 05 38 29.5183497624 -02 28 47.707630896   17.7   16.3   ~ 2 0
37 2MASS J05383415-0251340 PM* 05 38 34.1417423928 -02 51 34.064682048         16.60 ~ 1 0
38 UCAC3 176-24681 PM* 05 38 39.6211057152 -02 26 49.727059260 15.617 14.15 13.14 12.54 12.02 ~ 6 0
39 NAME Garrison 1 OpC 05 38 42 -02 36.0           ~ 539 0
40 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 779 0
41 [W96] rJ053847-0237 TT* 05 38 47.91648 -02 37 19.2360 16.81 16.78 15.51 15.01 13.39 M1.0 24 0
42 2MASS J05384945-0249568 Y*O 05 38 49.4526703128 -02 49 56.890735932     16.05 15.17 14.40 K6.5 3 0
43 [BNM2013] 93.03 3 LM* 05 38 49.6418292600 -02 45 26.997571908     16.48 15.38 14.15 M1.0 7 0
44 UCAC3 176-24721 * 05 38 52.8591053064 -02 19 28.751615148           ~ 2 0
45 2MASS J05385543-0241297 LM* 05 38 55.4462626968 -02 41 29.720989932   17.65 16.14 14.98 13.59 M3.0 10 0
46 2MASS J05385663-0257021 Y*O 05 38 56.6381055552 -02 57 02.213083512   16.92 15.46 14.44 13.32 M2.6 8 0
47 Mayrit 707162 Y*O 05 38 59.109048 -02 47 13.38720   16.08 14.22 15.38 12.561 M2.0 18 0
48 2MASS J05390581-0226154 Y*O 05 39 05.8214049624 -02 26 15.495480420   20.12 18.54 17.33 15.83 ~ 6 0
49 [BZR99] S Ori 20 Y*O 05 39 07.5827704608 -02 29 05.658266004   22.49   19.02 17.03 M5.5 16 0
50 [HHM2007] 941 LM* 05 39 13.4856161328 -02 23 51.857493828   19.21 17.73 16.59 15.23 ~ 5 0
51 2MASS J05391564-0229568 Y*O 05 39 15.6427679280 -02 29 56.928427728   12.18 11.68 10.8 10.87 K1.5 10 0
52 UCAC3 174-25035 PM* 05 39 18.2767297008 -03 00 49.966612164         13.98 ~ 1 0
53 [HHM2007] 998 * 05 39 20.1016084632 -02 21 56.614362480           ~ 2 0
54 2MASS J05392401-0257486 Y*O 05 39 24.0187215072 -02 57 48.564411048   15.83 14.38 13.40 12.36 M1.8 8 0
55 UCAC3 175-24686 PM* 05 39 24.2057214072 -02 55 28.611909588     14.06 13.38 12.76 ~ 7 0
56 2MASS J05392675-0233378 * 05 39 26.7636277896 -02 33 37.852271460   13.34 12.70   11.97 ~ 3 0
57 2MASS J05394173-0219463 Y*O 05 39 41.7344285040 -02 19 46.409572416   19.84 18.25 17.06 15.61 ~ 3 0
58 2MASS J05394741-0226162 Y*O 05 39 47.4181583232 -02 26 16.311591456   12.74 11.83 11.77 10.962 K0 11 0
59 UCAC2 30800252 PM* 05 39 47.5999999536 -02 58 59.328884712   12.56 11.99   11.05 ~ 6 0
60 [HHM2007] 1242 * 05 39 50.9215561608 -02 23 51.114496920           ~ 3 0
61 [SE2004] 112 PM* 05 39 52.5716951352 -02 11 32.340340176   20.2   19.3 16.13 ~ 3 0
62 V* V605 Ori TT* 05 39 54.280104 -02 24 39.42216     15.01 14.91 12.808 M1.0 20 0
63 2MASS J05395602-0251228 Y*O 05 39 56.0315758632 -02 51 23.034863880   17.61 16.12 14.94 13.49 ~ 9 0
64 USNO-B1.0 0876-00109704 * 05 39 59.8586851488 -02 20 21.819135660         15.77 ~ 1 0
65 2MASS J05400101-0219597 Y*O 05 40 01.0149074880 -02 19 59.842731288   18.0 18.47 17.08 14.95 ~ 16 0
66 [HHM2007] 1354 * 05 40 07.8553031736 -02 35 55.312440576   19.81 18.27 17.18 15.96 ~ 3 0
67 UCAC3 175-24864 PM* 05 40 23.6206521576 -02 43 07.821718968   12.3 12.59 12.1 11.80 ~ 5 0
68 HD 294297 * 05 40 27.5432293608 -02 25 43.161205152   10.7 10.117 10.01 9.77 G2: 29 0
69 UCAC3 175-24878 * 05 40 29.4423368184 -02 39 07.012555236         14.99 ~ 1 0
70 UCAC2 30800350 PM* 05 40 36.6679052184 -02 43 46.994436408         12.39 ~ 2 0
71 SIPS J0540-0227 PM* 05 40 38.3617526016 -02 27 06.412357476   19.3   18.9 15.55 ~ 3 0
72 USNO-B1.0 0874-00105297 * 05 40 42.1163219736 -02 31 01.222801824         15.44 ~ 1 0
73 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 492 0
74 IC 434 HII 05 41 -02.5           ~ 85 1
75 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1095 1
76 NAME Cha II MoC 12 54 -77.2           ~ 321 0
77 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 633 0
78 NAME Ori Belt reg ~ ~           ~ 74 0

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2023.02.09-06:06:40

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