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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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Osservazione e dati astrometrici
| Costellazione: | Vergine |
| Ascensione retta: | 12h27m53.68s |
| Declinazione: | +08°53'55.2" |
| Magnitudine apparente: | 8.823 |
| Distanza: | 414.938 parsec |
| Moto proprio RA: | -19.6 |
| Moto proprio Dec: | 20.9 |
| B-T magnitude: | 9.989 |
| V-T magnitude: | 8.92 |
Cataloghi e designazioni:
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