Chandra Detection of a Close X-Ray Companion and Rich Emission-Line Spectrum in the Wolf-Rayet Binary γ Velorum

Details Chandra Detection of a Close X-Ray Companion and Rich Emission-Line Spectrum in the Wolf-Rayet Binary γ Velorum Chandra Detection of a Close X-Ray Companion and Rich Emission-Line Spectrum in the Wolf-Rayet Binary γ Velorum

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558l.113s&link_type=abstract

The Astrophysical Journal, Volume 558, Issue 2, pp. L113-L116.

Astronomy and Astrophysics

Astronomy

33

Stars: Individual: Constellation Name: Γ2 Velorum, Stars: Individual: Henry Draper Number: Hd 68273, Stars: Wolf-Rayet, X-Rays: Stars

Scientific paper

We present first results of a high-resolution X-ray observation of the nearby Wolf-Rayet binary system γ2 Velorum (WC8 + O7.5) using the Chandra High-Energy Transmission Grating (HETG). Emission lines from Mg, Si, S, Ne, and Fe dominate the spectrum and imply a range of plasma temperatures from ~4 MK up to at least ~25 MK. The strongest lines are broadened, but no Doppler shifts are detected. He-like triplets show strong forbidden lines with no significant weakening from collisional effects or photoexcitation, contrasting sharply with the diluted forbidden lines of single O-type supergiants such as ζ Puppis. These results imply that some lines such as the Ne IX triplet are formed in cooler plasma at tens of stellar radii or more from the O star, well outside of the central wind interaction region located near the O star surface. Lastly, we report the discovery of a new X-ray source lying only 4.8" north of γ2 Vel that is very likely a low-mass pre-main-sequence star.

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