2007A&A...467..137C

Query : 2007A&A...467..137C

2007A&A...467..137C - Astronomy and Astrophysics, volume 467137-143 (2007/5-3)

A search for OB stars in the field of the galactic OB association Bochum 7. I. UBV-IR photometry and optical spectroscopy.

CORTI M., BOSCH G. and NIEMELA V.

Abstract (from CDS):

The presence of a Wolf-Rayet star, WR12, at α= 8h44m47.2s, δ= - 45°58'55.5" (J2000.0), triggered the search for a surrounding OB association now known as Bochum7. Several papers have dealt with the existence of Bo7, but none actually included spectral types of the stars. To assure the spectral types of members of the association, it is essential to have spectral images of them. In this paper we present previously unpublished spectra of OB stars over a 30 arcmin field covering the estimated field of the galactic OB association. From UBV aperture photometry, OB star candidates were selected, and optical spectroscopic observations were obtained for these in CASLEO, Argentina. 63 stars were classified as OB type, including 8 stars already present in the LSS catalogue, and 37 of these 63 stars did not have a well-known spectral type. The OB stars were used to test the properties of the interstellar dust in the line of sight and the relation between the diffuse interestelar band at 4428Å, which grows linearly with E(B–V) until 1mag. Combining our data with 2MASS IR photometry we tested and confirmed that derivation of stellar parameters from our photometry, using the CHORIZOS code, is highly reliable.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: open clusters and associations: individual: Bochum 7 - stars: early-type - techniques: spectroscopic - techniques: photometric

Nomenclature: Table 1: [CBN2007] JHHMMSS.s+DDMMSS N=64.

CDS comments: [CBN2007] J084437.8-455257 is 2MASS J08443780-4552564

Simbad objects: 67

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Number of rows : 67
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 IC 418 PN 05 27 28.2059533560 -12 41 50.282287764   9.405 9.010 10.118   O7fp 1059 2
2 * mu. Col V* 05 45 59.8950238944 -32 18 23.162261796 3.84 4.90 5.18 5.30 5.57 O9.5V 523 0
3 CPD-45 2895 * 08 43 18.8620664448 -46 07 39.334036836 12.25 11.66 11.66 12.21   B8V 6 0
4 CD-45 4447 * 08 43 24.1537949616 -46 08 28.658569200 10.76 11.26 10.77 11.02   O7.5V 20 0
5 CPD-45 2901 * 08 43 25.5436230624 -46 07 48.583487856 12.0 11.73 11.42     B9V 3 0
6 GSC 08151-01988 * 08 43 25.7502753360 -46 08 17.496939696     13.7     B2Ve 2 0
7 GSC 08151-02258 * 08 43 27.6271264008 -46 02 38.191080012     12.6     B0V 3 0
8 WRAY 15-266 Em* 08 43 27.9668315640 -46 09 26.392648824   12.25 11.77     ~ 3 0
9 CD-45 4451 * 08 43 32.3194034976 -45 53 36.418869276 9.96 10.45 10.09 10.14   O7.5V 19 0
10 CPD-45 2910 * 08 43 38.6424844224 -46 08 15.837813492 11.93 12.78 11.98     O9.5V 4 0
11 CPD-45 2909 * 08 43 39.5325911880 -45 51 47.258407476 12.10 12.24 11.7     B2III 4 0
12 GSC 08151-01812 * 08 43 44.9350784880 -46 06 53.796706740     12.9     B1V 3 0
13 GSC 08151-00062 * 08 43 46.8698820408 -46 06 39.058694496     14.2     B3V 4 0
14 TYC 8151-1072-1 * 08 43 48.7934027616 -46 07 33.713704812   12.64 12.66     ~ 7 0
15 CD-45 4461 * 08 43 49.4807710008 -45 42 05.381252748 12.04 12.47 12.25     B4V 8 0
16 CPD-45 2920 EB* 08 43 49.8047993256 -46 07 08.757379416 10.6 11.36 10.99 10.91   O6.5V(n)((f)) 39 1
17 TOI-2905 ** 08 43 50.84616 -45 58 19.4628   13.471 12.881 12.715   B1.5V 3 0
18 CD-45 4462 ** 08 43 51.0870877776 -46 03 46.278754344 11.31 11.87 11.36 11.30   OB- 15 0
19 CD-45 4464 * 08 43 59.8101126936 -46 02 36.092787828 11.92 12.01 11.86     B6.5V 4 0
20 LS 1140 * 08 44 04.5156801816 -45 53 15.934366680 12.06 12.38 11.65 11.45   OB+ 12 0
21 CD-45 4466 * 08 44 06.7758667392 -45 56 41.894503512 11.15 11.30 11.12     B2V~ 5 0
22 GSC 08151-03649 * 08 44 10.7380244616 -45 54 52.203749760     13.3     ~ 1 0
23 UCAC2 12176880 * 08 44 14.1357650736 -45 57 32.942345184     14.7     B1.7V 1 0
24 GSC 08151-04546 * 08 44 16.8358934592 -46 11 18.941491212     14.3     B1.5V 1 0
25 UCAC2 12176912 * 08 44 18.3864585408 -45 53 07.786532940     14.6     B1V 1 0
26 GSC 08151-03951 * 08 44 20.0038560576 -45 55 52.400955504     13.5     B2III 2 0
27 UCAC2 11950986 * 08 44 22.0863324552 -46 10 22.434499128     14.8     B1V 1 1
28 GSC 08151-03381 * 08 44 22.6017177120 -45 51 56.375060436 14.12 14.36 13.7     B1V 4 1
29 GSC 08151-04830 * 08 44 23.2491123984 -46 08 19.197916080 14.02 14.43 13.71 13.61   ~ 3 0
30 2MASS J08442335-4553371 * 08 44 23.3544521208 -45 53 37.069163808     14.5     B1.7V 2 0
31 CD-45 4472 * 08 44 25.0614061680 -45 53 34.556812908 11.45 11.90 11.29 11.21   OB 15 0
32 CD-45 4473 * 08 44 26.1154706496 -45 57 49.092737148 11.49 11.30 11.22     B8V 3 0
33 Cl Bochum 7 OpC 08 44 28.2 -45 55 19   6.94 6.8     ~ 52 0
34 GSC 08151-03643 EB* 08 44 31.6251327552 -45 53 14.850040668     13.5     B2III: 5 0
35 2MASS J08443291-4554408 * 08 44 32.9140704768 -45 54 40.831424352 14.43 14.73 14.2     B2V 1 1
36 CD-45 4476 * 08 44 33.4105 -45 41 16.763   10.67 10.51     B2III 6 0
37 TYC 8151-3379-1 * 08 44 34.2695369832 -45 52 13.652598036   12.89 12.31     B5V 6 0
38 2MASS J08443780-4552564 * 08 44 37.8002620248 -45 52 56.362178388     13.8     B9V 1 0
39 CPD-45 2951 * 08 44 39.0789299976 -46 07 45.034469076   12.14 12.13     B5V 8 0
40 UCAC2 11951152 * 08 44 42.1031277408 -46 08 00.629722788     14.1     B2V 2 0
41 CPD-45 2953 * 08 44 43.1147001216 -45 51 30.554247492 11.93 11.89 11.55     B8V 4 0
42 CD-45 4481 * 08 44 46.2811482936 -46 04 31.901777508 10.29 10.68 10.60     B3V~ 4 0
43 GSC 08151-02839 * 08 44 46.7462428224 -45 46 33.363481260     12.6     ~ 3 0
44 CD-45 4482 WR* 08 44 47.2901340000 -45 58 55.417387548 10.95 11.29 10.74 10.58   WN8h+? 108 0
45 CD-45 4483 * 08 44 47.4865366992 -46 03 38.383519248 10.8 11.17 11.08     B4V 5 0
46 CD-45 4484 Pu* 08 44 50.1574521936 -45 56 48.384615732 11.05 11.56 11.39     B2V 9 0
47 CPD-45 2961 * 08 44 51.0383617176 -46 10 10.760075112 11.55 12.07 11.53 11.45   OB 13 0
48 GSC 08151-03329 * 08 44 58.5683518608 -45 52 43.377928716     13.5     ~ 1 0
49 GSC 08151-04259 Pu* 08 45 00.4473035400 -45 58 34.356101952     12.6     B5V 4 0
50 CD-45 4491 * 08 45 01.9721507832 -45 50 34.409781024 10.13 10.53 10.30     B2IV~ 5 0
51 GSC 08151-03477 * 08 45 02.1902711688 -45 52 57.359205048     13.2     ~ 1 0
52 CD-45 4492 * 08 45 04.9189921848 -46 00 12.866227992 10.90 11.0 11.2     B2V~ 6 0
53 GSC 08151-01942 * 08 45 05.1204850176 -46 02 59.811604008     12.6     B2.5-3V 6 0
54 GSC 08151-02183 * 08 45 05.7432243480 -45 40 42.012024456     12.7     B1III 1 0
55 CD-45 4493 * 08 45 06.0308493408 -45 50 09.276504108 10.80 10.98 10.55     B2V~ 5 0
56 CD-45 4494 Em* 08 45 06.4409226072 -46 09 04.631970636 11.57 12.03 11.44 11.21   B1Ve 18 0
57 2MASS J08451026-4559107 * 08 45 10.2641960088 -45 59 10.779236304 14.30 14.61 14.0     B1V 1 1
58 CPD-45 2977 ** 08 45 10.4550924864 -45 58 54.659938980 11.27 11.47 10.98     O9.5II~ 3 0
59 GSC 08151-04203 * 08 45 18.2204746584 -45 58 16.691091060     13.6     B0.5V 3 0
60 CPD-45 2984 * 08 45 18.7066070952 -45 45 44.663260284 11.77 11.72 11.25     B2V 5 0
61 UCAC2 12177291 * 08 45 18.8876864160 -45 41 49.433184240     14.8     B5V 3 0
62 GSC 08151-03717 * 08 45 22.4384893584 -45 55 28.069927140     13.0     B1III 2 0
63 GSC 08151-03645 * 08 45 23.5864346640 -45 53 41.179580016     14.3     B8V 1 0
64 GSC 08151-01270 * 08 45 26.2019120592 -46 05 25.900031364     12.9     B2III 2 0
65 UCAC2 12177359 * 08 45 27.2459442648 -45 54 00.692994096     14.9     B6.5V 1 0
66 CPD-45 3000 * 08 45 43.2032283336 -46 07 41.657963016 11.18 11.75 11.37     B2.5V 5 0
67 CPD-45 3007 * 08 45 52.4028813120 -46 09 28.590920856 11.49 11.90 11.8     B5V 3 0

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