RASS/Dwarf ivo://nasa.heasarc/rassdwarf NASA/GSFC HEASARC Huensch, Schmitt, Voges 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Star 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/<a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+AS/132/155">CDS Catalog J/A+AS/132/155</a>. This is a service provided by NASA HEASARC . 1998A&AS..132..155H https://heasarc.gsfc.nasa.gov/W3Browse/all/rassdwarf.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rassdwarf& GET text/xml 180 99999 true 101.7446 -87.025 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rassdwarf GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rassdwarf&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0333333333333333 X-ray public rassdwarf ROSAT All-Sky Survey: A-K Dwarfs/Subgiants name Common Star Designation meta.id char nullable exposure_time Effective Exposure Time (sec) s time.duration;obs.exposure int nullable count_rate Mean PSPC Count Rate (cps) ct/s phot.count;em.X-ray.soft double nullable hr Bright Star Catalog Number meta.id;meta.main int nullable "__y_ra_dec" System unit vector column double nullable log_lx Logarithm of X-ray Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable "__row" System index column char nullable hardness_ratio_error Hardness Ratio Error stat.error;phot.count;arith.ratio float nullable vmag V Magnitude phot.mag;em.opt.V float nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable dec Declination degree pos.eq.dec;meta.main double nullable bv_color B-V Color Index phot.color;em.opt.B;em.opt.V float nullable likelihood Likelihood of Existence stat.likelihood short nullable binary_flag Binary Flag meta.code;src.class char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable count_rate_error PSPC Count Rate Error ct/s stat.error;phot.count;em.X-ray.soft float nullable "distance" Distance (pc) pc pos.distance float nullable flux Apparent X-ray Flux (erg/cm^2/s) erg/cm^2/s phot.flux;em.X-ray.soft double nullable class Browse Object Classification src.class short nullable rass_note Note on Star meta.note;obs char nullable spect_type MK Spectral Classification src.spType char nullable hardness_ratio Hardness Ratio phot.count;arith.ratio float nullable "__x_ra_dec" System unit vector column double nullable hd HD Catalog Number meta.id int nullable "__z_ra_dec" System unit vector column double nullable off_set Offset between Optical and X-ray Position arcsec short nullable