CHANDRA HETGSs multiphase spectroscopy of the young magnetic O star θ1 Orionis C

被引：173

作者：

Gagné, M

Oksala, ME

Cohen, DH

Tonnesen, SK

ud-Doula, A

Owocki, SP

Townsend, RHD

MacFarlane, JJ

机构：

[1] W Chester Univ, Dept Geol & Astron, Chester, PA 19383 USA

[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[3] Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA

[4] Columbia Univ, Dept Astron, Pupin Phys Labs 1328, New York, NY 10027 USA

[5] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[6] Univ Delaware, Bartol Res Inst, Sharp Lab 217, Newark, DE 19716 USA

[7] Prism Computat Sci, Madison, WI 53711 USA

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 628卷 / 02期

关键词：

stars : early-type; stars : individual (HD 37022); stars : magnetic fields; stars : mass loss; stars : rotation; stars; winds; outflows; X-rays : stars;

D O I：

10.1086/430873

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on four Chandra grating observations of the oblique magnetic rotator theta(1) Ori C (O5.5 V), covering a wide range of viewing angles with respect to the star's 1060 G dipole magnetic field. We employ line-width and centroid analyses to study the dynamics of the X-ray - emitting plasma in the circumstellar environment, as well as line-ratio diagnostics to constrain the spatial location, and global spectral modeling to constrain the temperature distribution and abundances of the very hot plasma. We investigate these diagnostics as a function of viewing angle and analyze them in conjunction with new MHD simulations of the magnetically channeled wind shock mechanism on theta(1) Ori C. This model fits all the data surprisingly well, predicting the temperature, luminosity, and occultation of the X-ray - emitting plasma with rotation phase.

引用

页码：986 / 1005

页数：20

共 60 条

[1] ABUNDANCES OF THE ELEMENTS - METEORITIC AND SOLAR [J].