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Titolo: Chandra detection of a close X-ray companion and rich emission-line spectrum in the Wolf-Rayet binary gamma velorum
Autore: Skinner, SL; Gudel, M; Schmutz, W; Stevens, IR;
- Indirizzi:
- Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA Univ Colorado Boulder CO USA 80309 & Space Astron, Boulder, CO 80309 USA Paul Scherrer Inst, CH-5235 Wurenlingen, Switzerland Paul Scherrer Inst Wurenlingen Switzerland CH-5235 enlingen, Switzerland Paul Scherrer Inst, CH-5235 Villigen, Switzerland Paul Scherrer Inst Villigen Switzerland CH-5235 35 Villigen, Switzerland Phys Meteorol Observ Davos, CH-7260 Davos, Switzerland Phys Meteorol Observ Davos Davos Switzerland CH-7260 Davos, Switzerland Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England Univ Birmingham Birmingham W Midlands England B15 2TT W Midlands, England
- Titolo Testata:
- ASTROPHYSICAL JOURNAL
fascicolo: 2,
volume: 558,
anno: 2001,
parte:, 2
pagine: L113 - L116
- SICI:
- 0004-637X(20010910)558:2<L113:CDOACX>2.0.ZU;2-C
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- SYSTEM; PARAMETERS; WINDS; STARS;
- Keywords:
- stars : individual (gamma(2) Velorum HD 68273); stars : Wolf-Rayet; X-rays : stars;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 25
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Skinner, SL Univ Colorado, Ctr Astrophys & Space Astron, Campus Box 389, Boulder, CO 80309 USA Univ Colorado Campus Box 389 Boulder CO USA 80309 CO 80309 USA
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- Citazione:
- S.L. Skinner et al., "Chandra detection of a close X-ray companion and rich emission-line spectrum in the Wolf-Rayet binary gamma velorum", ASTROPHYS J, 558(2), 2001, pp. L113-L116
Abstract
We present first results of a high-resolution X-ray observation of the nearby Wolf-Rayet binary system gamma (2) 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 similar to4 MK up to at least similar to 25 MK. The strongest lines arebroadened, but no Doppler shifts are detected. He-like triplets show strong forbidden lines with no significant weakening from collisional effects orphotoexcitation, contrasting sharply with the diluted forbidden lines of single O-type supergiants such as zeta Puppis. These results imply that somelines 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 gamma (2) Vel that is very likely a low-mass pre-main-sequence star.
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Documento generato il 19/06/13 alle ore 09:27:58