RASSOB - ROSAT All-Sky Survey: OB Stars
For detailed statistical analysis of the X-ray emission of hot stars, stars of
spectral type O and B listed in the Yale Bright Star Catalogue were selected
and searched for in the ROSAT All-Sky Survey. This database table displays a
compilation of the derived X-ray data for a complete sample of bright OB stars.
The ROSAT all-sky survey catalogue of optically bright OB-type stars.
Berghoefer T.W., Schmitt J.H.M.M., Cassinelli J.P.
<Astron. Astrophys. Suppl. Ser. 118, 481 (1996)>
=1996A&AS..118..481B (SIMBAD/NED BibCode)
V/50 : The Bright Star Catalogue
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)
The name of the current star.
Detection flag. A 'Y' means positive detection otherwise upper limit.
The right ascension of the object.
The declination of the object.
The galactic longitude of the object determined from the equatorial
The galactic latitude of the object determined from the equatorial
Photographic V magnitude from the Yale Bright Star Catalog.
Bright Star catalog number.
The MK spectral classification from the Yale Bright Star Catalog.
B-V magnitude from the Yale Bright Star Catalog.
Color excess from the Yale Bright Star Catalog.
Hydrogen column density in cm^-2 units from Shull and Van Steenberg 1985,
Fruscione et. al 1994.
Distance in parsecs.
Bolometric luminosity in units of 10^-7 W.
Exposure time in seconds.
Offset between optical and X-ray position in arcseconds.
Flag for offsets larger than 75 arcmin.
Mean PSPC count rate in ct/s.
Error of PSPC count rate in ct/s.
The hardness ratio, defined according to the following:
HD_Ratio = (H-S)/(H+S).
H = 0.5 - 2.9 keV Band Flux
S = 0.1 - 0.4 keV Band Flux
Error of HD_Ratio.
[1+-]Note on hardness ratio.
-: up. limit
+: low. limit
1: only S band
Estimated X-ray temperature in keV.
The logarithm of the apparent X-ray flux in units mW/m^2.
Error in log_x_flux in mW/m^2.
The logarithm of the X-ray luminosity in units of 10^-7 W.
The logarithm of the luminosity ratio: log(Lx/Lbol).
BROWSE classification type. The classification is based on the
'Spect_Type' parameter, if one is available.
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