NUVBEMDCAT ivo://nasa.heasarc/nuvbemdcat NASA/GSFC HEASARC Ansdell et al. 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Star Planets orbiting within the close-in habitable zones of M dwarf stars will be exposed to elevated high-energy radiation driven by strong magnetohydrodynamic dynamos during stellar youth. Near-ultraviolet (NUV) irradiation can erode and alter the chemistry of planetary atmospheres, and a quantitative description of the evolution of NUV emission from M dwarfs is needed when modeling these effects. The authors investigated the NUV luminosity evolution of early M-type dwarfs by cross-correlating the Lepine & Gaidos (LG11: 2011, AJ, 142, 138) catalog of bright M dwarfs (available at the HEASARC as the MDWARFASC table) with the Galaxy Evolution Explorer (GALEX) catalog of NUV (1771-2831 Angstrom) sources. Of the 4,805 sources with GALEX counterparts, 797 have NUV emission significantly (> 2.5 sigma) in excess of an empirical basal level. The authors inspected these candidate active stars using visible-wavelength spectra, high-resolution adaptive optics imaging, time-series photometry, and literature searches to identify cases where the elevated NUV emission is due to unresolved background sources or stellar companions; they estimated the overall occurrence of these "false positives" (FPs) as ~ 16%. The authors constructed an NUV luminosity function that accounted for FPs, detection biases of the source catalogs, and GALEX upper limits. They found the NUV luminosity function to be inconsistent with predictions from a constant star-formation rate and simplified age-activity relation defined by a two-parameter power law. This table was created by the HEASARC in March 2015 based on an electronic versions of Table 4 from the reference paper which was obtained from the ApJ web site. This is a service provided by NASA HEASARC . 2015ApJ...798...41A https://heasarc.gsfc.nasa.gov/W3Browse/all/nuvbemdcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=nuvbemdcat& GET text/xml 180 99999 true 321.364502 -81.641022 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=nuvbemdcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_nuvbemdcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Infrared Optical UV X-ray public nuvbemdcat Near-UV Detected Bright Early-M Dwarf Star Catalog low_halpha_fp_flag Flag [YN] Indicates Low H-Alpha False Positive meta.code char nullable nuv_k_color The (GALEX/NUV - K_S_) Color mag phot.color;em.UV.200-300nm;em.IR.K double nullable rass_flux ROSAT X-Ray Flux erg/s/cm^2 phot.flux;em.X-ray.soft double nullable name Stellar Identifier meta.id;meta.main char nullable dec Declination degree pos.eq.dec;meta.main double nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable fuv_flux GALEX/FUV Band Flux Density microJy phot.flux;em.UV.100-200nm double nullable log_r_corr_nuv_bol Logarithm R-Prime_NUV_ phys.luminosity;arith.ratio;em.UV.200-300nm double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable vmag The V Band Magnitude mag phot.mag;em.opt.V double nullable "__x_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable nuv_flux GALEX/NUV Band Flux Density microJy phot.flux;em.UV.200-300nm double nullable shifted_halpha_fp_flag Flag [YN] Indicates Shifted H-Alpha False Positive meta.code char nullable jmag The J Band Magnitude mag phot.mag;em.IR.J double nullable "__row" System index column char nullable halpha_ew H-Alpha Equivalent Width Angstrom spect.line.eqWidth;em.line.Halpha double nullable superwasp_fp_flag Flag [YN] Indicates SuperWASP False Positive meta.code char nullable robo_ao_fp_flag Flag [YN] Indicates Robo-AO False Positive meta.code char nullable "__y_ra_dec" System unit vector column double nullable false_positive_flags Flags [LDNRG] Indicate False Positive meta.code char nullable