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


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST10:48:58

2007A&A...467..137C - Astronomy and Astrophysics, volume 467, 137-143 (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 In this paper we present previously unpublished spectra of OB stars over a 30 arcmin field covering the estimated field of the galactic OB association.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 - 2020
#notes
1 IC 418 PN 05 27 28.2060343141 -12 41 50.282659007   9.78 13.0     O7fp 1000 2
2 * mu. Col V* 05 45 59.8953630749 -32 18 23.164726112 3.84 4.90 5.18 5.30 5.57 O9.5V 456 0
3 CPD-45 2895 * 08 43 18.8622608919 -46 07 39.332805388 12.25 11.66 11.66 12.21   B8V 1 0
4 CD-45 4447 * 08 43 24.1560753466 -46 08 28.624567738 10.76 11.26 10.77 11.02   O7.5V 18 0
5 CPD-45 2901 * 08 43 25.5437049059 -46 07 48.580769525 12.0 11.73 11.42     B9V 1 0
6 GSC 08151-01988 * 08 43 25.7504002771 -46 08 17.498782905     13.7     B2Ve 2 0
7 GSC 08151-02258 * 08 43 27.6272019511 -46 02 38.189312536     12.6     B0V 2 0
8 WRAY 15-266 Em* 08 43 27.9669082075 -46 09 26.390914238   12.25 11.77     ~ 2 0
9 CD-45 4451 * 08 43 32.3193844963 -45 53 36.418538936 9.96 10.45 10.09 10.14   O7.5V 11 0
10 CPD-45 2910 * 08 43 38.6426134918 -46 08 15.836605106 11.93 12.78 11.98     O9.5V 3 0
11 CPD-45 2909 * 08 43 39.5327535549 -45 51 47.255420347 12.10 12.24 11.7     B2III 1 0
12 GSC 08151-01812 * 08 43 44.9350939197 -46 06 53.795807994     12.9     B1V 3 0
13 GSC 08151-00062 * 08 43 46.8698167224 -46 06 39.057626491     14.2     B3V 3 0
14 TYC 8151-1072-1 * 08 43 48.7942327366 -46 07 33.712529329   12.64 12.66     ~ 7 0
15 CD-45 4461 * 08 43 49.4807566384 -45 42 05.381400388 12.04 12.47 12.25     B4V 2 0
16 CPD-45 2920 Al* 08 43 49.8049446233 -46 07 08.756732813 10.6 11.36 10.99 10.91   O6.5V(n)((f)) 33 1
17 GSC 08151-04243 * 08 43 50.85 -45 58 19.5     12.9     B1.5V 2 0
18 CD-45 4462 ** 08 43 51.0866710803 -46 03 46.281666246 11.31 11.87 11.36 11.30   OB- 12 0
19 CD-45 4464 * 08 43 59.8103142884 -46 02 36.090938271 11.92 12.01 11.86     B6.5V 2 0
20 LS 1140 * 08 44 04.5156342687 -45 53 15.932809537 12.06 12.38 11.65 11.45   OB+ 10 0
21 CD-45 4466 * 08 44 06.7752752973 -45 56 41.897807845 11.15 11.30 11.12     B2V~ 2 0
22 GSC 08151-03649 * 08 44 10.7380088182 -45 54 52.202874149     13.3     ~ 1 0
23 UCAC2 12176880 * 08 44 14.1358018663 -45 57 32.941005012     14.7     B1.7V 1 0
24 GSC 08151-04546 * 08 44 16.8360477280 -46 11 18.941854583     14.3     B1.5V 1 0
25 UCAC2 12176912 * 08 44 18.3861006559 -45 53 07.801376661     14.6     B1V 1 0
26 GSC 08151-03951 * 08 44 20.0038854979 -45 55 52.401580893     13.5     B2III 1 0
27 UCAC2 11950986 * 08 44 22.0865165972 -46 10 22.433841156     14.8     B1V 1 1
28 GSC 08151-03381 * 08 44 22.6017567167 -45 51 56.374376649 14.12 14.36 13.7     B1V 1 1
29 GSC 08151-04830 * 08 44 23.2491366015 -46 08 19.197576873 14.02 14.43 13.71 13.61   ~ 2 0
30 2MASS J08442335-4553371 * 08 44 23.3545196833 -45 53 37.068758876     14.5     B1.7V 1 0
31 CD-45 4472 * 08 44 25.0614191499 -45 53 34.554408298 11.45 11.90 11.29 11.21   OB 13 0
32 CD-45 4473 * 08 44 26.1155300017 -45 57 49.090918708 11.49 11.30 11.22     B8V 1 0
33 GSC 08151-03643 * 08 44 31.6252214451 -45 53 14.849774881     13.5     B2III: 2 0
34 2MASS J08443291-4554408 * 08 44 32.9140917197 -45 54 40.831738298 14.43 14.73 14.2     B2V 1 1
35 CD-45 4476 * 08 44 33.4105 -45 41 16.763   10.67 10.51     B2III 4 0
36 TYC 8151-3379-1 * 08 44 34.2697162892 -45 52 13.650440230   12.89 12.31     B5V 2 0
37 2MASS J08443780-4552564 * 08 44 37.80 -45 52 56.5     13.8     B9V 1 0
38 CPD-45 2951 * 08 44 39.0790091493 -46 07 45.033861634   12.14 12.13     B5V 3 0
39 UCAC2 11951152 * 08 44 42.1032279031 -46 08 00.629299318     14.1     B2V 1 0
40 CPD-45 2953 * 08 44 43.1148495182 -45 51 30.552803122 11.93 11.89 11.55     B8V 2 0
41 CD-45 4481 * 08 44 46.2812618500 -46 04 31.908222130 10.29 10.68 10.60     B3V~ 2 0
42 GSC 08151-02839 * 08 44 46.7463425193 -45 46 33.362447740     12.6     ~ 1 0
43 CD-45 4482 WR* 08 44 47.2902196838 -45 58 55.414166402 10.95 11.29 10.74 10.58   WN8h+? 98 0
44 CD-45 4483 * 08 44 47.4867249613 -46 03 38.378962686 10.8 11.17 11.08     B4V 2 0
45 C 0843-458 OpC 08 44.8 -45 58   6.94 6.8     ~ 36 0
46 CD-45 4484 * 08 44 50.1575780205 -45 56 48.381543117 11.05 11.56 11.39     B2V 4 0
47 CPD-45 2961 * 08 44 51.0384214374 -46 10 10.756884022 11.55 12.07 11.53 11.45   OB 10 0
48 GSC 08151-03329 * 08 44 58.5683528399 -45 52 43.378102581     13.5     ~ 1 0
49 GSC 08151-04259 * 08 45 00.4473982842 -45 58 34.356242185     12.6     B5V 1 0
50 CD-45 4491 * 08 45 01.9723850961 -45 50 34.406668454 10.13 10.53 10.30     B2IV~ 2 0
51 GSC 08151-03477 * 08 45 02.1903437347 -45 52 57.358382853     13.2     ~ 1 0
52 CD-45 4492 * 08 45 04.9190391179 -46 00 12.864029737 10.90 11.0 11.2     B2V~ 1 0
53 GSC 08151-01942 * 08 45 05.1206022210 -46 02 59.811275565     12.6     B2.5-3V 3 0
54 GSC 08151-02183 * 08 45 05.7431847935 -45 40 42.009370466     12.7     B1III 1 0
55 CD-45 4493 * 08 45 06.0310894874 -45 50 09.270514131 10.80 10.98 10.55     B2V~ 2 0
56 CD-45 4494 Em* 08 45 06.4412214685 -46 09 04.628749982 11.57 12.03 11.44 11.21   B1Ve 13 0
57 2MASS J08451026-4559107 * 08 45 10.2642358075 -45 59 10.777143192 14.30 14.61 14.0     B1V 1 1
58 CPD-45 2977 ** 08 45 10.4523166532 -45 58 54.664465927 11.27 11.47 10.98     O9.5II~ 2 0
59 GSC 08151-04203 * 08 45 18.2205422501 -45 58 16.690679446     13.6     B0.5V 2 0
60 CPD-45 2984 * 08 45 18.7060250158 -45 45 44.665063101 11.77 11.72 11.25     B2V 2 0
61 UCAC2 12177291 * 08 45 18.8876921566 -45 41 49.433006100     14.8     B5V 3 0
62 GSC 08151-03717 * 08 45 22.4383135690 -45 55 28.068496294     13.0     B1III 1 0
63 GSC 08151-03645 * 08 45 23.5865490861 -45 53 41.179066266     14.3     B8V 1 0
64 GSC 08151-01270 * 08 45 26.2019529282 -46 05 25.897505892     12.9     B2III 1 0
65 UCAC2 12177359 * 08 45 27.2460019315 -45 54 00.692067635     14.9     B6.5V 1 0
66 CPD-45 3000 * 08 45 43.2036194417 -46 07 41.655173807 11.18 11.75 11.37     B2.5V 2 0
67 CPD-45 3007 * 08 45 52.4030893563 -46 09 28.588782071 11.49 11.90 11.8     B5V 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.05-10:48:58

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