2015A&A...579A.108M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:31:11

2015A&A...579A.108M - Astronomy and Astrophysics, volume 579A, 108-108 (2015/7-1)

The little-studied cluster Berkeley 90. I. LS III +46 11: a very massive O3.5 If* + O3.5 If* binary.

MAIZ-APELLANIZ J., NEGUERUELA I., BARBA R.H., WALBORN N.R., PELLERIN A., SIMON-DIAZ S., SOTA A., MARCO A., ALONSO-SANTIAGO J., SANCHEZ BERMUDEZ J., GAMEN R.C. and LORENZO J.

Abstract (from CDS):

It appears that most (if not all) massive stars are born in multiple systems. At the same time, the most massive binaries are hard to find owing to their low numbers throughout the Galaxy and the implied large distances and extinctions. We want to study LS III +46 11, identified in this paper as a very massive binary; another nearby massive system, LS III +46 12; and the surrounding stellar cluster, Berkeley 90. Most of the data used in this paper are multi-epoch high S/N optical spectra, although we also use Lucky Imaging and archival photometry. The spectra are reduced with dedicated pipelines and processed with our own software, such as a spectroscopic-orbit code, CHORIZOS, and MGB. LS III +46 11 is identified as a new very early O-type spectroscopic binary [O3.5 If* + O3.5 If*] and LS III +46 12 as another early O-type system [O4.5 V((f))]. We measure a 97.2-day period for LS III +46 11 and derive minimum masses of 38.80±0.83M and 35.60±0.77M for its two stars. We measure the extinction to both stars, estimate the distance, search for optical companions, and study the surrounding cluster. In doing so, a variable extinction is found as well as discrepant results for the distance. We discuss possible explanations and suggest that LS III +46 12 may be a hidden binary system where the companion is currently undetected.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - dust, extinction - ISM: lines and bands - stars: early-type - stars: individual: LS III +46 11 - open clusters and associations: individual: Berkeley 90

Simbad objects: 32

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Number of rows : 32

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 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1271 1
2 RMC 139 WR* 05 38 42.3548071421 -69 04 58.201053806   12.04 11.94     O6.5Iafc+O6Iaf 86 0
3 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1734 1
4 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 738 0
5 * 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
6 V* V712 Car bL* 10 23 58.0120989646 -57 45 48.938103165 15.466 15.473 13.5 12.6   O3If*/WN6+O3If*/WN6 147 1
7 Cl Westerlund 2 OpC 10 23 58.1 -57 45 49   11.59 10.5     ~ 277 0
8 HD 92740 WR* 10 41 17.5154230335 -59 40 36.897706569 5.68 6.50 6.42 7.38   WN7h+O9III-V 381 0
9 HD 93129 ** 10 43 57.486 -59 32 51.44 6.26 7.06 6.90     O2If*+O3.5V((f)) 188 1
10 NGC 3372 HII 10 44 19.0 -59 53 21           ~ 888 2
11 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 59 0
12 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 940 1
13 NGC 6193 OpC 16 41 20 -48 45.8           ~ 132 0
14 HD 150136 SB* 16 41 20.4156742370 -48 45 46.728092318 4.98 5.78 5.65 6.93   O3.5-4III(f*)+O6IV 171 0
15 Cl Pismis 24 OpC 17 24 43.0 -34 12 23   11.00 9.6     ~ 106 0
16 HD 319718 ** 17 24 43.490 -34 11 57.03 12.28 11.94 10.44 10.05   O3.5If* 82 0
17 Schulte 22 ** 20 33 08.799 +41 13 18.21 14.33 13.59 11.55     O3If*+O6V((f)) 63 0
18 Schulte 9 s*b 20 33 10.7366753544 +41 15 08.222187463 13.38 12.77 10.96     O4.5If 206 0
19 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 790 0
20 Schulte 7 * 20 33 14.1095790591 +41 20 21.903381641 12.24 12.00 10.55     O3If* 129 0
21 [GS55] 215 ISM 20 34.8 +46 56           ~ 2 0
22 LBN 357 HII 20 35 02 +47 02.4           ~ 21 0
23 2MASS J20350798+4649321 * 20 35 07.9881361676 +46 49 32.098188082 14.829 14.623 13.246 12.307   O8V 2 0
24 LS III +46 11 s*b 20 35 12.6367860828 +46 51 12.105513052 12.46 12.295 10.926 10.005   O3.5If*+O3.5If* 25 0
25 2MASS J20351389+4651065 * 20 35 13.9001944054 +46 51 06.189110364           ~ 2 0
26 2MASS J20351402+4650549 * 20 35 14.0416519589 +46 50 54.748933309           ~ 2 0
27 2MASS J20351405+4651025 * 20 35 14.0547644568 +46 51 02.490501718           ~ 1 0
28 2MASS J20351436+4650562 * 20 35 14.3638718998 +46 50 56.209969891           ~ 1 0
29 Cl Berkeley 90 OpC 20 35 15 +46 50.5           ~ 20 0
30 2MASS J20351786+4650112 * 20 35 17.8509811071 +46 50 11.285769942           ~ 1 0
31 2MASS J20351823+4650072 * 20 35 18.1752696127 +46 50 07.538434808           ~ 1 0
32 LS III +46 12 * 20 35 18.5653057894 +46 50 02.911695779 11.07 11.217 10.262 9.640   O4.5IV(f) 24 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:31:11

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