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Multiwavelength study of the WO star Sand 2

Published online by Cambridge University Press:  07 August 2017

L. Norci ,
V.F. Polcaro ,
C. Rossi  and
R. Viotti
L. Norci
Affiliation:
1Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, D-85740 Garching, B.R. Deutschland
V.F. Polcaro
Affiliation:
1Istituto di Astrofisica Spaziale, via Enrico Fermi 21, 1-00044 Frascati, Italy
C. Rossi
Affiliation:
1Istituto Astronomico, Universitá di Roma La Sapienza, 1-00161 Roma, Italy
R. Viotti
Affiliation:
1Istituto di Astrofisica Spaziale, via Enrico Fermi 21, 1-00044 Frascati, Italy

Abstract

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We present the results of a multifrequency observation of the WO star Sand 2 in the LMC. Two ROSAT PSPC observations, with exposure times of 8953 s and 4540 s, are used to investigate possible X-ray emission from Sand 2. The optical spectrum observed with the ESO 2.2m telescope close to the time of the ROSAT observations, shows strong emission lines of HeII, CIV, OV and OVI. All lines have a velocity broadening of 4 200±100 km s−1. The UV spectrum from the IUE archive shows a CIV resonance doublet at 155 nm with a P-Cygni absorption at ∼ −5 000 km s−1, with wings extending to about −8 000 km s−1. A combination of two different BB temperatures (80 000 K and 25 000 K) are required to fit the UV-optical continuum, dereddened by EB-V = 0.25.

Keywords

stars: Wolf-RayetWOLMCindividual: Sand 2
Type
Session I - Basic parameters, properties of single Wolf-Ray et stars
Information
Symposium - International Astronomical Union , Volume 163: Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution , 1995 , pp. 66 - 67
Copyright
Copyright © Kluwer 1995 

References

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