DETECTION OF A NEW WHITE-DWARF BINARY-SYSTEM IN THE EXTREME ULTRAVIOLET USING THE ROSAT WIDE FIELD CAMERA

被引：26

作者：

COOKE, BA

BARSTOW, MA

BREEVELD, ER

CHARLES, PA

GOODALL, CV

GOURLAY, JA

HASSALL, BJM

HUCKLE, HE

KENT, BJ

PYE, JP

RICHARDS, AG

SIMS, MR

SUMNER, TJ

WATSON, MG

WELLS, A

WILLINGALE, R

WRIGHT, JS

机构：

[1] UCL, MULLARD SPACE SCI LAB, DORKING RH5 6NT, SURREY, ENGLAND

[2] ROYAL GREENWICH OBSERV, CAMBRIDGE CB3 OEZ, ENGLAND

[3] UNIV BIRMINGHAM, SCH PHYS & SPACE RES, BIRMINGHAM B15 2TT, W MIDLANDS, ENGLAND

[4] IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND

[5] RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND

来源：

NATURE | 1992年 / 355卷 / 6355期

关键词：

D O I：

10.1038/355061a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

DETAILED understanding of the evolution of main-sequence stars into white dwarfs depends on knowledge of the chemical composition of white-dwarf atmospheres, but the hottest white dwarfs emit much of their radiation in the extreme ultraviolet (EUV), a part of the spectrum that has been generally inaccessible to astronomers. We report here the discovery of a new white dwarf as a bright EUV source found during the first observations using the Wide Field Camera 1 on the Rosat satellite. Within the 1-arcmin error box of the EUV source is an unusually blue star, which we show to be a binary system consisting of a DA white dwarf and a cool companion in the classification range dM2-dM5. There are some similarities between this new object and the binary system Feige 24 (ref. 2), but spectral differences in the EUV emission can be attributed to significantly different atmospheric compositions for the two white dwarfs.

引用

页码：61 / 63

页数：3

共 14 条

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THORSTENSEN JR, 1978, ASTROPHYS J, V233, P260

[12] ROSAT [J].