High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton

被引：108

作者：

Raassen, AJJ

Mewe, R

Audard, M

Güdel, M

Behar, E

Kaastra, JS

van der Meer, RLJ

Foley, CR

Ness, JU

机构：

[1] SRON Netherlands Inst Space Res, NL-3584 CA Utrecht, Netherlands

[2] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[4] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

[5] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

[6] Univ Hamburg, D-21029 Hamburg, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2002年 / 389卷 / 01期

关键词：

stars; individual; Procyon; alpha Canis Minoris; stars : coronae; stars : late-type; stars : activity; X-rays : stars;

D O I：

10.1051/0004-6361:20020529

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the analysis of the high-resolution soft X-ray spectrum of the nearby F-type star Procyon in the wavelength range from 5 to 175 Angstrom obtained with the Low Energy Transmission Grating Spectrometer (LETGS) on board Chandra and with the Reflection Grating Spectrometers (RGS) and the EPIC-MOS CCD spectrometers on board XMM-Newton. Line fluxes have been measured separately for the RGS and LETGS. Spectra have been fitted globally to obtain self-consistent temperatures, emission measures, and abundances. The total volume emission measure is similar to4.1 x 10(50) cm(-3) with a peak between 1 and 3 MK. No indications for a dominant hot component (T greater than or similar to 4 MK) were found. We present additional evidence for the lack of a solar-type FIP-effect, confirming earlier EUVE results.

引用

页码：228 / 238

页数：11

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