RASSOB - ROSAT All-Sky Survey: OB Stars

Overview

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.

Catalog Bibcode

1996A&AS..118..481B

References

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)
See also:
    V/50 : The Bright Star Catalogue
    IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)

Parameters

Name
The name of the current star.

Detect_Flag
Detection flag. A 'Y' means positive detection otherwise upper limit.

RA
The right ascension of the object.

Dec
The declination of the object.

LII
The galactic longitude of the object determined from the equatorial coordinates.

BII
The galactic latitude of the object determined from the equatorial coordinates.

Vmag
Photographic V magnitude from the Yale Bright Star Catalog.

Catalog_Number
Bright Star catalog number.

Spect_Type
The MK spectral classification from the Yale Bright Star Catalog.

BV_Color
B-V magnitude from the Yale Bright Star Catalog.

BV_Color_Excess
Color excess from the Yale Bright Star Catalog.

Log_H_Density
Hydrogen column density in cm^-2 units from Shull and Van Steenberg 1985, Fruscione et. al 1994.

Distance
Distance in parsecs.

Log_Bol_Lum
Bolometric luminosity in units of 10^-7 W.

Exposure
Exposure time in seconds.

Sep_X_Opt
Offset between optical and X-ray position in arcseconds.

Sep_X_Opt_Flag
Flag for offsets larger than 75 arcmin.

Count_Rate
Mean PSPC count rate in ct/s.

Count_Rate_Error
Error of PSPC count rate in ct/s.

HD_Ratio
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

HD_Ratio_Error
Error of HD_Ratio.

HD_Ratio_Flag
[1+-]Note on hardness ratio.

      -: up. limit
      +: low. limit
      1: only S band

Temp_X
Estimated X-ray temperature in keV.

Log_X_Flux
The logarithm of the apparent X-ray flux in units mW/m².

Log_X_Flux_Error
Error in log_x_flux in mW/m².

Log_X_Lum
The logarithm of the X-ray luminosity in units of 10^-7 W.

Ratio_Lum
The logarithm of the luminosity ratio: log(Lx/Lbol).

Class
BROWSE classification type. The classification is based on the 'Spect_Type' parameter, if one is available.

Contact Person

Questions regarding the RASSOB database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:33:32 EDT