The table contains optical and X-ray data of all 450 detected late-type giants and supergiants including A-type stars listed in the BSC.
The columns of the table contain the following information:
Column 1: HR number (BSC)
Column 2: HD number
Column 3: the star's name (Bayer or Flamsteed designation)
Column 4: V magnitude (from BSC)
Column 5: B-V colour index (from BSC)
Column 6: MK spectral classification (from BSC)
Column 7: binary flag; S: single star, VB: visual binary (if a companion within 90 arcseconds distance is known), SB: spectroscopic binary (as given in the BSC), RS: RS CVn system (usually also SB), B: other binary (composite spectrum), CV: cataclysmic companion (HR 4765 = 4 Dra), Symb: symbiotic star (HR 8992 = R Aqr)
Column 8: effective exposure time in seconds
Column 9: mean PSPC count rate in counts per second
Column 10: error of PSPC count rate
Column 11: likelihood of existence (cf. Sect. 2.1)
Column 12: offset in arcseconds between optical and X-ray position
Column 13: hardness ratio 
(cf. Sect. 2.4)
Column 14: error of hardness ratio
Column 15: apparent X-ray flux (
) in
(see Sect. 2.4)
Column 16: logarithm of X-ray to bolometric flux ratio (see Sect. 2.4).
Acknowledgements
The ROSAT project is supported by the Bundesministerium für Bildung, Forschung und Technologie (BMBF/DARA) and the Max-Planck-Gesellschaft (MPG). We would like to thank our colleagues from the MPE ROSAT group, especially T. Berghöfer, for their support. MH acknowledges the hospitality of the MPE during his stay in Garching.