2009A&A...503..985C


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.12CEST17:26:24

2009A&A...503..985C - Astronomy and Astrophysics, volume 503, 985-990 (2009/9-1)

A FEROS spectroscopic study of the extreme O supergiant He 3-759.

CROWTHER P.A. and EVANS C.J.

Abstract (from CDS):

We present a study of the extreme O-type supergiant He3-759 using new high-resolution FEROS data, revealing that it is a near spectroscopic twin of HD 151804 (O8Iaf). We investigate the extinction towards He3-759 using a variety of methods, revealing AV∼4.7m. If we assume He3-759 has an identical absolute K-band magnitude to HD151804 we find that it lies in the Sagittarius-Carina spiral arm at a distance of ∼6.5kpc. We derive the physical and wind properties for He3-759, revealing T*=30.5kK, logL/L=5.9 and {dot}(M)=10–5.17M/yr for a clumped wind whose terminal velocity is estimated at 1000km/s. The atmosphere of He3-759 is enriched in helium (XHe=49%) and nitrogen (XN=0.3%). A reanalysis of HD151804 and HD152408 (WN9ha) reveals similar parameters except that the WN9ha star possesses a stronger wind and reduced surface hydrogen content. HD151804 and HD152408 lie within the Sco OB1 association, with initial masses of ∼60M and ages ∼2.7Myr, consistent with NGC6231 cluster members using standard Geneva isochrones. Improved agreement with observed surface abundances are obtained for similar initial masses with more recent Geneva group predictions from which higher ages of ∼3.75Myr are obtained. No young, massive star cluster is known to be associated with He3-759.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: fundamental parameters - stars: individual: He3-759, HD151804, HD152408

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 - 2020
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5702 1
2 NAME Car Arm PoG 10 00 -60.0           ~ 381 1
3 MR 41 WR* 12 11 18.5515045852 -62 29 43.612232119   12.24 11.35 10.94 9.78 WR 17 0
4 IRAS 12094-6212 V*? 12 12 08.3628487898 -62 29 00.144091714     14.54 13.30   M7 3 0
5 NAME Car-Sgr Arm PoG 15 00 -40.0           ~ 430 1
6 HD 151804 s*b 16 51 33.7215112148 -41 13 49.928887100 4.45 5.29 5.22     O8Iaf 351 0
7 NAME Sco OB 1 As* 16 53.5 -41 57           ~ 195 0
8 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 487 0
9 HD 152408 s*b 16 54 58.50567 -41 09 03.0964 5.17 5.92 5.77 7.00   O8Iape 348 0
10 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11619 0
11 HD 313846 WR* 18 05 25.7345590489 -23 00 20.335027460 10.48 10.69 9.89 9.89   WN9h+OB 125 0

    Equat.    Gal    SGal    Ecl

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2020.08.12-17:26:24

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