XMM-Newton observations of the nitrogen-rich Wolf-Rayet star WR 1

Details XMM-Newton observations of the nitrogen-rich Wolf-Rayet star WR 1 XMM-Newton observations of the nitrogen-rich Wolf-Rayet star WR 1

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...408..353i&link_type=abstract

Astronomy and Astrophysics, v.408, p.353-361 (2003)

Astronomy and Astrophysics

Astrophysics

17

Stars: Individual: Wr 1 (Hd 4004), Stars: Winds, Outflows, Stars: Early-Type, X-Rays: Stars

Scientific paper

We present XMM-Newton results for the X-ray spectrum from the N-rich Wolf-Rayet (WR) star WR 1. The EPIC instrument was used to obtain a medium-resolution spectrum. The following features characterize this spectrum: (a) significant emission ``bumps'' appear that are coincident with the wavelengths of typical strong lines, such as MgXI, SiXIII, and SXV; (b) little emission is detected above 4 keV, in contrast to recent reports of a hard component in the stars WR 6 and WR 110 which are of similar subtype; and (c) evidence for sulfur K-edge absorption at about 2.6 keV, which could only arise from absorption of X-rays by the ambient stellar wind. The lack of hard emission in our dataset is suggestive that WR 1 may truly be a single star, thus representing the first detailed X-ray spectrum that isolates the WR wind alone (in contrast to colliding wind zones). Although the properties of the S-edge are not well-constrained by our data, it does appear to be real, and its detection indicates that at least some of the hot gas in WR 1 must reside interior to the radius of optical depth unity for the total absorptive opacity at the energy of the edge.

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