2026-04-04T08:36:05Z ivo://nasa.heasarc/rassdwarf 2026-04-03T10:06:08Z IVOAROSAT All-Sky Survey: A-K Dwarfs/Subgiants This catalog presents X-ray data for all the main-sequence and subgiant stars of spectral types A, F, G, and K and luminosity classes IV and V listed in the Bright Star Catalogue (also known as the HR Catalogue) that have been detected as X-ray sources in the ROSAT All-Sky Survey (RASS). A number of stars in the appropriate spectral type range that do not have assigned luminosity classes have also been included. The catalogue contains 980 such HR stars detected as X-ray sources out of a total of 3054 stars in the HR Catalogue that satisfy the selection criteris, implying an average detection rate of 32%. In addition to the measured ROSAT PSPC count rates, source detection parameters, hardness ratios, and X-ray fluxes, X-ray luminosities derived from Hipparcos parallaxes are also listed. This database was created at the HEASARC in February 1999 based on the ADC/&lt;a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+AS/132/155"&gt;CDS Catalog J/A+AS/132/155&lt;/a&gt;. This is a service provided by NASA HEASARC . Starhttps://dc.g-vo.org/rr/q/lp/custom/nasa.heasarc/rassdwarfhttps://heasarc.gsfc.nasa.gov/W3Browse/all/rassdwarf.html https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rassdwarf&Action=More+Options&Action=Parameter+Search&ConeAdd=1 Huensch, Schmitt, VogesNASA/GSFC HEASARC2026NASA/GSFC HEASARC help desk <heasarc-vo at athena.gsfc.nasa.gov>DatasetAstroObjectsastronomy