2007A&A...467L..23C


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.13CEST11:46:01

2007A&A...467L..23C - Astronomy and Astrophysics, volume 467, L23-27 (2007/5-3)

A very massive runaway star from Cygnus OB2.

COMERON F. and PASQUALI A.

Abstract (from CDS):

We investigate the star BD+43° 3654 and the possibility that it may have originated in the massive OB association Cygnus OB2. We present new spectroscopic observations allowing a reliable spectral classification of the star, and discuss existing MSX observations of its associated bow shock and astrometric information not previously studied. Our observations reveal that BD+43° 3654 is a very early and luminous star of spectral type O4If, with an estimated mass of (70 ±15)M and an age of ∼1.6Myr. The high spatial resolution of the MSX observations allows us to determine its direction of motion in the plane of the sky by means of the symmetry axis of the well-defined bow shock, which matches well the orientation expected from the proper motion. Tracing back its path across the sky we find that BD+43° 3654 was located near the central, densest region of Cygnus OB2 at a time in the past similar to its estimated age. BD+43° 3654 turns out to be one of the three most massive runaway stars known, and it most likely formed in the central region of Cygnus OB2. A runaway formation mechanism by means of dynamical ejection is consistent with our results.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: kinematics - stars: individual: BD+43° 3654 - Galaxy: open clusters and associations: individual: Cygnus OB2

Simbad objects: 13

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Number of rows : 13

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9482 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5702 1
3 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1094 1
4 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1023 0
5 HD 190429A s*b 20 03 29.395 +36 01 30.53   7.20 7.09     O4If 81 0
6 NAME Cyg Complex reg 20 32 +45.0           ~ 520 0
7 Schulte 22A * 20 33 08.7656525268 +41 13 18.701813455           O3If* 17 0
8 Schulte 22B SB* 20 33 08.8434068322 +41 13 17.226918757           O6V((f)) 13 0
9 Schulte 9 s*b 20 33 10.7366753544 +41 15 08.222187463 13.38 12.77 10.96     O4.5If 207 0
10 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 794 0
11 BD+40 4227A SB* 20 33 15.0780900764 +41 18 50.478859468 10.42 10.27 8.98 8.03 6.83 O6Ib(fc)+O4.5:III:(fc) 216 0
12 BD+43 3654 s*b 20 33 36.0795380204 +43 59 07.362541702   11.24 10.06     O4If 50 0
13 * lam Cep s*b 22 11 30.5750839949 +59 24 52.147736074 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 646 1

    Equat.    Gal    SGal    Ecl

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2020.08.13-11:46:01

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