Solar Neighborhood. 23. CCD Photometric Distance Estimates of SCR Targets-77 M Dwarf Systems Within 25 pc

摘要

We present CCD photometric distance estimates of 100 SCR (SuperCOSMOS RECONS) systems with mu >= 0'.18/yr, 29 of which are new discoveries previously unpublished in this series of papers. These distances are estimated using a combination of new VRI photometry acquired at CTIO and JHK magnitudes extracted from 2MASS. The estimates are improvements over those determined using photographic plate BRI magnitudes from SuperCOSMOS plus JHK, as presented in the original discovery papers. In total, 77 of the 100 systems investigated are predicted to be within 25 pc. If all 77 systems are confirmed to have pi(sub trig) >= 40 mas, this sample would represent a 23% increase in M dwarf systems nearer than 25 pc in the southern sky.