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
收藏
页码：228 / 238
页数：11
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