ROTXRAYCAT ivo://nasa.heasarc/rotxraycat NASA/GSFC HEASARC Wright et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains photometric and derived stellar parameters for a sample of 820 solar and late-type stars (the original table of 824 entries had 4 near-duplicate entries for the stars HD 19668, HD 95188, HD 216803 and HD 285382 which have been removed by the HEASARC) from nearby open clusters and the field, including rotation periods and X-ray luminosities. This sample was used by the authors to study the relationship between rotation and stellar activity and derive a new estimate of the convective turnover time. From an unbiased subset of this sample the power law slope of the unsaturated regime, L<sub>X</sub>/L<sub>bol</sub> ~ R<sub>o</sub><sup>beta</sup>, is fit as beta = -2.70 +/- 0.13. This is inconsistent with the canonical beta = -2 slope to a confidence of 5 sigma, and argues for an additional term in the dynamo number equation. From a simple scaling analysis, this implies Delta(Omega)/Omega ~ Omega<sup>0.7</sup>, i.e. the differential rotation of solar-type stars gradually declines as they spin down. Super-saturation is observed for the fastest rotators in this sample and its parametric dependencies are explored. Significant correlations are found with both the corotation radius and the excess polar updraft, the latter theory providing a stronger dependence and being supported by other observations. The authors estimate mass-dependent empirical thresholds for saturation and super- saturation and map out three regimes of coronal emission. Late F-type stars are shown never to pass through the saturated regime, passing straight from super-saturated to unsaturated X-ray emission. The theoretical threshold for coronal stripping is shown to be significantly different from the empirical saturation threshold (R<sub>o</sub> < 0.13), suggesting it is not responsible. Instead, the authors suggest that a different dynamo configuration is at work in stars with saturated coronal emission. This is supported by a correlation between the empirical saturation threshold and the time when stars transition between convective and interface sequences in rotational spin-down models. This table was created by the HEASARC in March 2012 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/743/48">CDS Catalog J/ApJ/743/48</a> file catalog.dat. The original table had 824 entries, including 4 near-duplicate entries for the stars HD 19668, HD 95188, HD 216803 and HD 285382, which have been removed by the HEASARC. This is a service provided by NASA HEASARC . 2011ApJ...743...48W https://heasarc.gsfc.nasa.gov/W3Browse/all/rotxraycat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rotxraycat& GET text/xml 180 99999 true 327.27433333 -72.1025 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rotxraycat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rotxraycat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Optical X-ray public rotxraycat Stars with Rotation Periods & X-Ray Luminosities Catalog name Source Designation meta.id;meta.main char nullable hd_number Henry Draper Catalog Number (Cat. III/135) meta.id int nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable vmag Observed V Magnitude of Star mag phot.mag;em.opt.V double nullable "distance" Distance to Star pc pos.distance double nullable spect_type Spectral Type of Star src.spType char nullable log_lx Logarithm of the Intrinsic X-Ray Luminosity of the Star log(erg/s) phys.luminosity;em.X-ray double nullable log_lx_lbol Logarithm of the Ratio of the X-Ray Luminosity to the Bolometric Luminosity phys.luminosity;arith.ratio double nullable rotation_period Rotation Period of the Star d time.period double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable lbol Bolometric Luminosity of the Star Solar_Luminosity phys.luminosity double nullable radius Radius of the Star Solar_Radius phys.size.radius double nullable r_cz_radius Height of the Radiative-Convective Boundary (as a Function of Stellar Radius) phys.size.radius;arith.ratio double nullable twomass_name 2MASS Source Designation (Cat. II/246) meta.id.cross char nullable cns3_name Catalog of Nearby Stars Source Designation (Cat. V/70) meta.id char nullable vk_color Dereddened V-K Color of Star mag phot.color;em.opt.V;em.IR.K double nullable class Browse Object Classification src.class short nullable cluster_name Name of Open Cluster or Field That Star Is Part of meta.id.assoc char nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable ref_rotation_period Reference Code for Rotation Period meta.ref;time.period char nullable mass Mass of the Star Solar_Mass phys.mass double nullable ref_log_lx Reference Code for X-Ray Luminosity meta.ref;phys.luminosity;em.X-ray char nullable t_eff Effective Temperature of the Star K phys.temperature short nullable gcvs_name General Catalog of Variable Stars Source Designation (Cat. B/gcvs) meta.id char nullable ref_spect_type Reference Code for Spectral Type meta.ref;src.spType char nullable hip_number Hipparcos Catalog Number (Cat. I/239) meta.id int nullable