On the nature of the X-ray emission from 1E 1024.0-5732/Wack 2134: The first X-ray-selected Wolf-Rayet star

Details On the nature of the X-ray emission from 1E 1024.0-5732/Wack 2134: The first X-ray-selected Wolf-Rayet star On the nature of the X-ray emission from 1E 1024.0-5732/Wack 2134: The first X-ray-selected Wolf-Rayet star

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..943m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 943-946

Astronomy and Astrophysics

Astronomy

17

Light (Visible Radiation), O Stars, Stellar Winds, Visible Spectrum, Wolf-Rayet Stars, X Ray Astronomy, X Ray Binaries, X Rays, Astronomical Catalogs, Goodness Of Fit, Heao 2, Hubble Space Telescope, Maximum Likelihood Estimates, Proportional Counters, Rosat Mission, Stellar Luminosity

Scientific paper

We report on a ROSAT Position-Sensitive Proportional Counter (PSPC) observation of the X-ray source 1E 1024.0-5732. The optical identification with the emission-line star Wackerling 2134 is confirmed, but we do not find any evidence of the periodic pulsations at 61 ms which were previously reported in its X-ray flux. On the basis of the new timing and spectral results, a reexamination of the old X-ray and optical data, and a new optical spectrum, we propose that this source is a new Wolf-Rayet star of type WN6. The high level of X-ray emission hints at the presence of a binary companion to Wack 2134. This could be either an accreting compact object or a massive OB star, in which case the X-rays would be produced in the colliding winds of the two stars. The small equivalent widths of the Wolf-Rayet star emission lines strongly support the O-star companion hypothesis. If this scenario is confirmed, Wack 2134 would be the first case of an X-ray-selected Wolf-Rayet star.

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