CHAMPLANE ivo://nasa.heasarc/champlane NASA/GSFC HEASARC Koenig et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The authors have carried out optical and X-ray spectral analyses on a sample of 136 candidate optical counterparts of X-ray sources found in five Galactic bulge fields included in their Chandra Multiwavelength Plane (ChaMPlane) Survey. They used a combination of optical spectral fitting and quantile X-ray analysis to obtain the hydrogen column density toward each object, and a three-dimensional dust model of the Galaxy to estimate the most probable distance in each case. They present the discovery of a population of stellar coronal emission sources, likely consisting of pre-main-sequence, young main-sequence, and main-sequence stars, as well as a component of active binaries of RS CVn or BY Dra type. They identify one candidate quiescent low-mass X-ray binary with a sub-giant companion, but note that this object may also be an RS CVn system. They report the discovery of 3 new X-ray-detected cataclysmic variables (CVs) in the direction of the Galactic center (at distances <~2 kpc). This number is in excess of predictions made with a simple CV model based on a local CV space density of <~10<sup>-5</sup> pc<sup>-3</sup>, and a scale height of ~200 pc. They discuss several possible reasons for this observed excess in their paper. This table was created by the HEASARC in October 2008 based on the version of Table 5 from the paper which was obtained from the electronic ApJ web site. This is a service provided by NASA HEASARC . 2008ApJ...685..463K https://heasarc.gsfc.nasa.gov/W3Browse/all/champlane.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=champlane& GET text/xml 180 99999 true 258.832416666667 -40.069888888889 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=champlane GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_champlane&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Optical X-ray public champlane Chandra Multiwavelength Plane Survey Optical ID Catalog name ChOPS Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable counts Background-Subtracted 0.3-0.8 keV Net Counts ct phot;em.X-ray short nullable counts_error Uncertainty in Counts ct stat.error;phot;em.X-ray short nullable rmag R Band Magnitude mag phot.mag;em.opt.R double nullable rmag_error Uncertainty in R Band Magnitude mag stat.error;phot.mag;em.opt.R double nullable spect_type Spectral Type Classification src.spType char nullable log_lx_limit Limit Flag for Log_Lx meta.code;phys.luminosity;em.X-ray char nullable log_lx Log of 0.5-2 keV X-Ray Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable log_lx_error Uncertainty in Log_Lx log(erg/s) stat.error;phys.luminosity;em.X-ray 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 lii Galactic Longitude degree pos.galactic.lon double nullable abs_vmag_limit Limit Flag for VMag meta.code;phys.magAbs;em.opt.V char nullable fx_over_fr Ratio of Unabsorbed 0.5-2 keV X-Ray to Unreddened R Band Flux phot.flux;arith.ratio double nullable field_id Field Identifier meta.id;obs.field char nullable fx_over_fr_error Uncertainty in Fx/FR stat.error;phot.flux;arith.ratio double nullable nh_flag Flag [d] Indicates NH Estimated from QCCD Analysis meta.code;phys.columnDensity char nullable abs_vmag_error Uncertainty in Absolute V Band Magnitude mag stat.error;phys.magAbs;em.opt.V double nullable nh_limit Limit Flag for NH meta.code;phys.columnDensity char nullable bii Galactic Latitude degree pos.galactic.lat double nullable off_set Positional Offset between X-Ray and Optical Position (arcsec) arcsec pos.angDistance double nullable random_match_prob Random Match Probability stat.probability double nullable nh_error Uncertainty in NH (cm^-2) H-atoms/cm^2 stat.error;phys.columnDensity double nullable nh Hydrogen Column Density from Spectral Fit (cm^-2) H-atoms/cm^2 phys.columnDensity double nullable xo_error_radius Combined 95% X-Ray and Optical Position Error Circle (arcsec) arcsec stat.error;pos double nullable num_opt_matches Number of Optical Matches meta.number;src;em.opt short nullable distance_limit Limit Flag for Distance meta.code;pos.distance char nullable "distance" Distance (kpc); Error ~60% kpc pos.distance double nullable broad_type Special Source Classification Type src.class char nullable abs_vmag Absolute V Band Magnitude mag phys.magAbs;em.opt.V double nullable fx_over_fr_limit Limit Flag for Fx/FR meta.code;phot.flux;arith.ratio char nullable counts_flag Flag [L] Indicates Source Has Signal-to-Noise Ratio Less Than 3 meta.code;phot;em.X-ray char nullable