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HD 73813


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An Einstein Observatory SAO-based catalog of B-type stars
About 4000 X-ray images obtained with the Einstein Observatory are usedto measure the 0.16-4.0 keV emission from 1545 B-type SAO stars fallingin the about 10 percent of the sky surveyed with the IPC. Seventy-fourdetected X-ray sources with B-type stars are identified, and it isestimated that no more than 15 can be misidentified. Upper limits to theX-ray emission of the remaining stars are presented. In addition tosummarizing the X-ray measurements and giving other relevant opticaldata, the present extensive catalog discusses the reduction process andanalyzes selection effects associated with both SAO catalog completenessand IPC target selection procedures. It is concluded that X-rayemission, at the level of Lx not less than 10 exp 30 ergs/s, is quitecommon in B stars of early spectral types (B0-B3), regardless ofluminosity class, but that emission, at the same level, becomes lesscommon, or nonexistent, in later B-type stars.

Broad-band photometry of selected southern ultraviolet-bright stars.
Not Available

A survey of ultraviolet objects
An all-sky survey of ultraviolet objects is presented together with astatistical analysis that leads to the conclusion that there is asignificantly higher population of hot subdwarfs lying below themain-sequence than hitherto thought. The distribution of all ultravioletobjects, main sequence ultraviolet objects, and MK unclassifiedultraviolet objects are shown in galactic coordinates, and the absolutemagnitudes and color-color diagrams for these groups are presented.Scale heights are derived, giving values similar to planetary nebulaefor the hottest groups.

Catalog of multiple Trapezium type systems
Not Available

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观测天体数据

星座:船帆座
右阿森松:08h38m26.52s
赤纬:-46°46'35.1"
视星:7.798
距离:740.741 天文距离
右阿森松适当运动:-9.7
赤纬适当运动:5.8
B-T magnitude:7.732
V-T magnitude:7.793

目录:
适当名称
HD 1989HD 73813
TYCHO-2 2000TYC 8151-4781-1
USNO-A2.0USNO-A2 0375-06177167
HIPHIP 42379

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