A look with BeppoSAX at the low-luminosity Galactic X-ray source 4U 2206+54

被引：32
|
作者：
Masetti, N
Dal Fiume, D
Amati, L
Del Sordo, S
Frontera, F
Orlandini, M
Palazzi, E
机构：
[1] CNR, Sez Bologna, Ist Astrofis Spaziale & Fis Cosm, I-40129 Bologna, Italy
[2] CNR, Ist Tecnol & Studio Radiaz Extraterr, I-40129 Bologna, Italy
[3] CNR, Sez Palermo, Ist Astrofis Spaziale & Fis Cosm, I-90146 Palermo, Italy
[4] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy
来源：
ASTRONOMY & ASTROPHYSICS | 2004年 / 423卷 / 01期
关键词：
stars : binaries : close; X-rays : binaries; stars : neutron; stars : individuals : 4U 2206+54; accretion; accretion disks;
D O I：
10.1051/0004-6361:20040273
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A pointed observation of the low-luminosity galactic source 4U 2206+54 was carried out in November 1998 with BeppoSAX. The light curve of 4U 2206+54 shows erratic variability oil a timescale of similar to1 h; neither hardness variations nor time periodicities are detected throughout this 67 ks long observation. Thanks to the wide spectral coverage capabilities of BeppoSAX we could observe the source X-ray continuum over three energy decades, from 0.6 to 60 keV. The spectrum could be equally well fitted either with a blackbody plus Comptonization or with a high energy cutoff power law. No iron emission around 6.5 keV was detected, while a tentative detection of a cyclotron resonant feature in absorption is presented. Comparison of the present BeppoSAX data with the information available in the literature for this source suggests that 4U 2206+54 is a close binary system in which a (possibly magnetized) NS is accreting from the companion star wind.
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收藏
页码：311 / 319
页数：9
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