ROSAT DETECTIONS OF X-RAY-EMISSION FROM YOUNG B-TYPE STARS

被引:54
作者
SCHMITT, JHMM
ZINNECKER, H
CRUDDACE, R
HARNDEN, FR
机构
[1] UNIV WURZBURG,INST ASTRON & ASTROPHYS,W-8700 WURZBURG,GERMANY
[2] USN,RES LAB,EO HULBERT CTR SPACE RES,WASHINGTON,DC 20375
[3] HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138
关键词
STARS-CORONAE; X-RAYS-STARS;
D O I
10.1086/186688
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present first results of a series of pointings of the ROSAT HRI at visual binaries consisting of a B-star with a later-type companion. The binaries selected for this study are very likely physical pairs. Dating of the B-type stars with respect to the zero-age main sequence, as well as spectroscopic observations of the late-type stars, provides evidence for the extreme youth of these systems with ages typically near or below 10(8) yr. Surprisingly, the late-B component was in many cases detected as an X-ray source, in contrast to previous findings that X-ray emission among late-B field stars is rather uncommon.
引用
收藏
页码:L13 / L16
页数:4
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