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HD 108505


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Results from an extensive Einstein stellar survey
The preliminary results of the Einstein Observatory stellar X-ray surveyare presented. To date, 143 soft X-ray sources have been identified withstellar counterparts, leaving no doubt that stars in general constitutea pervasive class of low-luminosity galactic X-ray sources. Stars alongthe entire main sequence, of all luminosity classes, pre-main sequencestars as well as very evolved stars have been detected. Early type OBstars have X-ray luminosities in the range 10 to the 31st to 10 to the34th ergs/s; late type stars show a somewhat lower range of X-rayemission levels, from 10 to the 26th to 10 to the 31st ergs/s. Late typemain-sequence stars show little dependence of X-ray emission levels uponstellar effective temperature; similarly, the observations suggest weak,if any, dependence of X-ray luminosity upon effective gravity. Instead,the data show a broad range of emission levels (about three orders ofmagnitude) throughout the main sequence later than F0.

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Observation and Astrometry data

Constellation:Virgo
Right ascension:12h27m53.68s
Declination:+08°53'55.2"
Apparent magnitude:8.823
Distance:414.938 parsecs
Proper motion RA:-19.6
Proper motion Dec:20.9
B-T magnitude:9.989
V-T magnitude:8.92

Catalogs and designations:
Proper Names
HD 1989HD 108505
TYCHO-2 2000TYC 874-709-1
USNO-A2.0USNO-A2 0975-06966146
HIPHIP 60815

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