HARD X-RAY EMISSION ASSOCIATED WITH WHITE DWARFS. III.

被引：21
作者：
Bilikova, Jana [1 ]
Chu, You-Hua [1 ]
Gruendl, Robert A. [1 ]
Maddox, Larry A. [1 ]
机构：
[1] Univ Illinois, Dept Astron, Urbana, IL 61801 USA
来源：
ASTRONOMICAL JOURNAL | 2010年 / 140卷 / 05期
关键词：
binaries: general; stars: coronae; stars: late-type; white dwarfs; X-rays: general; HUBBLE-SPACE-TELESCOPE; BINARY-SYSTEM; CATALOG; STARS; COMPANIONS; HOT; DISCOVERY; MASS; SPECTROSCOPY; SPECTRA;
D O I：
10.1088/0004-6256/140/5/1433
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Hard X-ray emission associated with white dwarfs (WDs) can be used to diagnose the presence of late-type binary companions, mass accretion from companions, or physical processes with unknown origins. Since our previous systematic searches for hard X-ray emission associated with WDs, the Galactic WD catalog has been augmented by >10,000 new WDs from the Sloan Digital Sky Survey and new X-ray point-source catalogs from XMM-Newton and ROSAT have become available. Therefore, we have extended the search using the updated catalogs, and found 17 new cases of WDs associated with hard X-ray emission. The 32 WDs associated with hard X-ray emission, from the current and previous searches, can be divided into five categories: (1) binary WD with a coronal companion, (2) binary WD with mass transfer from a companion, (3) single hot WD with a hard X-ray component peaking near 1 keV in addition to a soft photospheric component, (4) two PG 1159 stars with very faint X-ray emission in the 0.9-2.0 keV band, and (5) two DA WDs whose photospheric emission component has a hard shoulder extending to 0.5-0.9 keV. The origin of the hard X-ray emission in the latter three categories is not yet known. Deeper X-ray observations with higher angular and spectral resolutions are needed to help us understand these WDs' hard X-ray emission.
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收藏
页码：1433 / 1443
页数：11
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