2 NEW HOT WHITE-DWARFS IN A REGION OF EXCEPTIONALLY LOW HI DENSITY

被引：4

作者：

BARSTOW, MA

WESEMAEL, F

HOLBERG, JB

WERNER, K

BUCKLEY, DAH

STOBIE, RS

FONTAINE, G

ROSEN, SR

DEMERS, S

LAMONTAGNE, R

IRWIN, MJ

BERGERON, P

KEPLER, SO

VENNES, S

机构：

[1] UNIV MONTREAL,MONTREAL,PQ,CANADA

[2] UNIV ARIZONA,TUCSON,AZ

[3] CHRISTIAN ALBRECHTS UNIV KIEL,KIEL,GERMANY

[4] UNIV CAPE TOWN,DEPT ASTRON,CAPE TOWN,SOUTH AFRICA

[5] ROYAL OBSERV,EDINBURGH EH9 3HJ,MIDLOTHIAN,SCOTLAND

[6] ROYAL GREENWICH OBSERV,GREENWICH,ENGLAND

[7] UNIV FED RIO GRANDE SUL,PORTO ALEGRE,RS,BRAZIL

[8] UNIV CALIF BERKELEY,BERKELEY,CA

来源：

SPACE ASTRONOMY | 1993年 / 13卷 / 12期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/0273-1177(93)90121-Q

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

We report the discovery of two hot white dwarfs which have the lowest line-of-sight neutral hydrogen column densities yet measured. The stars were found independently by the ROSAT EUV, Montreal-Cambridge-Tololo, and Edinburgh-Cape surveys. Follow-up observations made using the Voyager 2 ultraviolet spectrometer reveal strong continua shortward of the 912 Angstrom Lyman limit from which we deduce that the neutral hydrogen column densities are 1.3 x 10(17) and 2.0 x 10(17) atoms cm(-2).

引用

页码：281 / 285

页数：5

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