PLEIADXRAY - ROSAT PSPC Catalog of the Pleiades (Micela et al. 1996)
ROSAT Observations of the Pleiades. I. X-Ray Characteristics of a Coeval Stellar Population Micela G., Sciortino S., Kashyap V., Harnden F.R., Rosner R. <Astrophys. J. Suppl. 102, 75 (1996)> =1996ApJS..102...75M
A running number in order of increasing Right Ascension.
The star designation as listed in the reference. Notice that the prefixes of these names are typically not in the standardized system as used, for example, by Simbad. To convert them to their Simbad equivalents, one typically should add 'Cl* Melotte 22 ' in front of these names. For the convenience of users of this table, the HEASARC lists below a concordance of the names used in this table with their Simbad equivalents:
Name in Table Simbad Equivalent A # not in Simbad ALR # Cl* Melotte 22 ALR # B # Cl* Melotte 22 B # Hz # Cl Melotte 22 # HCG # Cl* Melotte 22 HCG # JRS # not in Simbad MT # Cl* Melotte 22 MT # SK # Cl* Melotte 22 SK # T # not in Simbad VM # Cl* Melotte 22 VM #
The Right Ascension of the Pleiades star in the specified equinox. In the original table, the RA was given in equinox 2000 and with a precision of 0.1 seconds of time.
The Declination of the Pleiades star in the specified equinox. In the original table, this was given in equinox 2000 and with a precision of 0.1 arcseconds.
The Galactic Longitude of the Pleiades star.
The Galactic Latitude of the Pleiades star.
The V magnitude of the Pleiades star.
A code for the reference for the V Magnitude: the key is given in ftp://cdsarc.u-strasbg.fr/pub/J/ApJS/102/75/refs.dat.gz
The B-V color of the Pleiades star.
The spectral type of the Pleiades star.
A code for the reference for the spectral type: the key is given in ftp://cdsarc.u-strasbg.fr/pub/J/ApJS/102/75/refs.dat.gz
This parameter is set to '<' to indicate an upper limit for the projected rotation velocity, v sin(i).
The projected rotation velocity, v sin(i), in km/s, where v is the actual rotation velocity and i is the inclination angle.
Some concise remarks on the binarity, variability, flare star nature, and/or alternate names of the Pleiades star.
A code for the reference for the source for the remarks: the key is given in ftp://cdsarc.u-strasbg.fr/pub/J/ApJS/102/75/refs.dat.gz
This parameter is set to 'Y' to indicate a value of the (B-V) reddening E(B-V) > 0.1.
The X-ray to optical position offset in the Right Ascension direction, in arcseconds, for stars detected as X-ray sources with EXSAS or PROS that do not belong to complexes of overlapping sources.
The X-ray to optical position offset in the Declination direction, in arcseconds, for stars detected as X-ray sources with EXSAS or PROS that do not belong to complexes of overlapping sources.
The off-axis angle of the star, in arcminutes, i.e., the difference between the center of the ROSAT PSPC FOV and the stellar position.
This parameter is set to '<' to indicate an upper limit for the PSPC count rate.
The PSPC count rate of the X-ray source, in ct/s (converted by the HEASARC from the units of ct/ks in the original table).
The signal-to-noise ratio of the X-ray source, i.e., the number of sigma.
The hardness ratio of the X-ray source, defined as the ratio of the counts in the 0.2 to 0.9 keV band to those in the 0.9 to 2.01 keV band. The values of the hardness ratio were individually corrected for the vignetting energy dependence and for nonuniformities of the PSPC using the values of the exposure map at the source positions in the various energy bands considered.
The mean error in the X-ray hardness ratio.
The Counts-to-Energy Conversion Factor (CCEF), in units of 10^-11 erg/cm^2/count = 10^-14 W/count, i.e., the number which the count rate has been multiplied by to convert it to the source flux in the 0.16 to 4.0 keV bandpass.
This parameter is set to '<' to indicate an upper limit for the (logarithm of the) X-Ray Luminosity, log L(X).
The logarithm of the X-Ray luminosity, log L(X), in erg/s, in the 0.16 to 4.0 keV bandpass, computed for an assumed distance of 127 pc. For the stars B 203 and Hz 2366 the X-ray luminosities are quoted as upper limits, since the authors attribute the emission from the detected sources to different counterparts.
This parameter has a non-blank value to indicate X-ray sources that have been identified with more than one star or are in complexes of overlapping sources. Stars with the same value for this parameter are identified with the same X-ray source.
The HEASARC browse classification, derived from the value of the spectral type parameter.