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Astron. Astrophys. 327, 648-655 (1997)

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SS433 in the ultraviolet *

J.F. Dolan 1, P.T. Boyd 1, 2, S. Fabrika 3, S. Tapia 3, V. Bychkov 3, A.A. Panferov 3, M.J. Nelson 4, J.W. Percival 4, G.W. van Citters 5, D.C. Taylor 6 and M.J. Taylor 7

1 Laboratory for Astronomy & Solar Physics NASA Goddard Space Flight Center, Greenbelt, MD 20771 USA
2 Universities Space Research Association @ NASA Goddard Space Flight Center, Greenbelt, MD 20771 USA
3 Special Astrophysical Observatory, Nizhnij Arkhyz, Karachai-Cherkess Republic, 357147, Russia
4 Department of Astronomy & Space Astronomy Laboratory, University of Wisconsin, Madison, WI 53706 USA
5 Division of Astronomical Sciences, National Science Foundation, 4201 Wilson Blvd., Arlington, VA 22230 USA
6 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 USA
7 Department of Physics and Engineering, Loras College, P.O. Box 178, Dubuque, IA 52004 USA

Received 2 April 1997 / Accepted 27 June 1997

Abstract

The High Speed Photometer (HSP) on the Hubble Space Telescope observed SS433 at 15 different epochs between 1993 May and November. Polarimetric observations were obtained in a 340 Å FWHM bandpass centered at 2770 Å; photometric observations were made in a bandpass extending between 1400 and 3000 Å. The polarization in the UV is both large ([FORMULA]) and variable. Observations at the 6-m telescope of the Special Astrophysical Observatory find the polarization in the U band to be intermediate in magnitude between that in the V band and that we detect in the UV. These results are best explained by the existence of a Rayleigh scattering component in the polarized radiation. Less than 1.2% of the flux from SS433 between 1400 and 3000 Å is modulated with a period between [FORMULA] and 100 s at 164-d phase [FORMULA], when the two sets of emission lines in the SS433 spectrum have a local maximum in the separation of their redshifts.

Key words: polarization – stars: individual: SS433 – ultraviolet: stars

* Based in part on observations with the Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by AURA, Inc. under NASA contract NAS5-26555.

Send offprint requests to: J.F. Dolan

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© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998
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