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Wind clumping and the wind-wind collision zone in the Wolf-Rayet binary gamma Velorum

Autor: Schild, H., Guedel, M., Mewe, R., Schmutz, W., Raassen, A. J. J, Audard, M., Dumm, T., van der Hucht, K. A., Leutenegger, M. A., Skinner, S. L.

Publikováno v: Astron.Astrophys. 422 (2004) 177-191

We present XMM-Newton observations of gamma^2 Velorum (WR 11, WC8+O7.5III, P = 78.53 d), a nearby Wolf-Ray binary system, at its X-ray high and low states. At high state, emission from a hot collisional plasma dominates from about 1 to 8 keV. At low

Externí odkaz: http://arxiv.org/abs/astro-ph/0404610

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A large Wolf-Rayet population in NGC300 uncovered by VLT-FORS2

Autor: Schild, H., Crowther, P. A., Abbott, J. B., Schmutz, W.

Publikováno v: Astron.Astrophys. 397 (2003) 859-870

We have detected 58 Wolf-Rayet candidates in the central region of the nearby spiral galaxy NGC 300, based on deep VLT-FORS2 narrow-band imaging. Our survey is close to complete except for heavily reddened WR stars. Of the objects in our list, 16 sta

Externí odkaz: http://arxiv.org/abs/astro-ph/0209259

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High resolution spectroscopy of symbiotic stars. VI. Orbital and stellar parameters for AR Pav

Autor: Schild, H., Dumm, T., Muerset, U., Nussbaumer, H., Schmid, H. M., Schmutz, W.

We present new dynamical parameters of the AR Pav binary system. Ourobservations consist of a series of high resolution optical/NIR spectra from which we derive the radial velocity curve of the red giant as well as its rotation velocity. Assuming co-

Externí odkaz: http://arxiv.org/abs/astro-ph/0011562

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