PMSU1 - Table 1A

Positions, distances, absolute magnitudes and spectral types for pCNS3 late-K and M dwarf stars north of declination -30^o.
Column 1 lists a running number, the line number in the pCNS3 . This is not an offical designation, but provides a useful means of identifying individual stars in a catalogue of 3700+ stars. Column 2 lists the object name; columns 3 and 4 give the position, for equinox and epoch 2000, derived from the source listed in column 5. The latter references are:
1. Co-ordinates measured at the Palomar 60-inch telescope
2. Co-ordinates measured at either the Palomar 200-inch telescope, Keck or the AAT
3. HST Guide Star catalogue (version 1)
4. pCNS3
5. Digital Sky Survey images
6. Hipparcos catalogue
7. 2MASS 2nd incremental release
In several cases, the positions given in PMSU1 were in error; as far as possible, those errors are corrected in the current tables.
Column 6 lists the absolute visual magnitude, column 7 the distance (in parsecs) and column 8 the fractional (percentage) uncertainty in the distance (note that trigonometric parallax measurements are symmetric in parallax, not distance). The original distance estimates were derived by combining the available trigonometric parallax measurements with photometric and spectroscopic distance estimates, and columns 9 and 10 list the relative weights given to astrometric (trig) and spectrophotometric (sp)measurements. Where possible, we have updated the distance estimates using new results, notably trigonometric parallax data from the Hipparcos satellite (ESA, 1997): f_trig=110 denotes an Hipparcos distance estimate; a value of 105 indicates that the distance is based on Hipparcos parallax data for a companion star (usually the primary in a binary system); 150 indicates that the data are taken from the pCNS3. Column 11 lists the spectral type, and references to notes on individual stars are given in column 12. Where possible, we provide links to ascii versions of our spectroscopic data.