2008A&A...489..713L


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET05:55:09

2008A&A...489..713L - Astronomy and Astrophysics, volume 489, 713-723 (2008/10-2)

High-resolution optical spectroscopy of Plaskett's star.

LINDER N., RAUW G., MARTINS F., SANA H., DE BECKER M. and GOSSET E.

Abstract (from CDS):

Plaskett's star (HD 47129) is a very massive O + O binary that belongs to the Mon OB2 association. Previous work suggests that this system displays the Struve-Sahade effect although the measurements of the secondary radial velocities are very difficult and give controversial results. Both components have powerful stellar winds that collide and produce a strong X-ray emission. Our aim is to study the physical parameters of this system in detail and to investigate the relation between its spectral properties and its evolutionary status. We present here analysis of an extensive set of high-resolution optical spectra of HD 47129. We used a disentangling method to separate the individual spectra of each star. We derived a new orbital solution and discuss the spectral classification of both components. A Doppler tomography technique applied to the emission lines Hα and HeII λ 4686 yields a Doppler map that illustrates the wind interactions in the system. Finally, an atmosphere code is used to determine the different chemical abundances of the system components and the wind parameters. HD 47129 appears to be an O8 III/I + O7.5 III binary system in a post RLOF evolutionary stage, where matter has been transferred from the primary to the secondary star. The He overabundance of the secondary supports this scenario. In addition, the N overabundance and C underabundance of the primary component confirm previous results based on X-ray spectroscopy and indicate that the primary is an evolved massive star. We also determined a new orbital solution, with MPsin3i=45.4±2.4M and MSsin3i=47.3±0.3M. Furthermore, the secondary star has a high rotational velocity (vsini∼300km/s) that deforms its surface, leading to a non-uniform distribution in effective temperature. This could explain the variations in the equivalent widths of the secondary lines with phase. We suggest that the wind of the secondary star is confined near the equatorial plane because of its high rotational velocity, affecting the ram pressure equilibrium in the wind interaction zone.

Abstract Copyright:

Journal keyword(s): stars: individual: HD47129 - binaries: spectroscopic - stars: fundamental parameters

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15196 1
2 NAME Rosette OB Association As* 06 31.7 +04 58           ~ 137 0
3 HD 46202 ** 06 32 10.4728 +04 57 59.818 7.60 8.36 8.19 7.98 7.86 O9.2V 259 0
4 HD 47129 SB* 06 37 24.0417003671 +06 08 07.376246443 5.23 6.11 6.06     O8I+O7.5III 372 0
5 HD 47240 Pu* 06 37 52.7036331811 +04 57 24.007346108 5.65 6.35 6.20 5.98 5.87 B1Ib 150 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 150 1
7 HD 93521 * 10 48 23.5116139485 +37 34 13.089937784 5.67 6.79 7.03     O9.5IIInn 406 1
8 V* TU Mus bL* 11 31 10.9242217305 -65 44 32.098796901 7.58 9.52 9.34 9.25   O8V(n)z+B0V(n) 153 0
9 HD 159176 SB* 17 34 42.4926595872 -32 34 53.964439199 4.88 5.74 5.70 7.19   O7V((f))+O7V((f)) 243 0
10 HD 228766 WR* 20 17 29.7043498327 +37 18 31.125286410 9.42 9.79 9.14     O4If+O8:II: 111 0
11 HD 215835 SB* 22 46 54.1108577770 +58 05 03.531709415 8.24 8.85 8.629   8.049 O5.5V((f))+O6V((f)) 239 0

    Equat.    Gal    SGal    Ecl

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