TINYMO selection criteria: * Between 20h and 8h RA, south of 0 Dec

1. A SEARCH FOR NEARBY STARS WITH TINY PROPER MOTIONS TINYMO Adric Riedel, Todd Henry, Jennifer Winters, Nigel Hambly and Most searches for undiscovered nearby stars, including previous SuperCOSMOS-RECONS (SCR) searches, have used proper motion as the primary selection criterion. This has worked well; only one star within 10 pc -- GJ 566AB (Xi Boo), a naked-eye G8V/K5V binary -- is moving slower than the 0.18 arcsec/yr cutoff adopted by Luyten for his Luyten Two Tenths sample. Nearly all subsequent searches have focused on more thorough sky coverage or fainter magnitude limits, but this neglects the possibility of other GJ 566-alikes that lurk nearby, undiscovered because of tiny proper motions. Our new project, dubbed “TINYMO”, uses photometric distance estimates as the primary detection method, sifting all the SuperCOSMOS points in half of the southern sky down to these 483 candidates. TINYMO selection criteria: * Between 20h and 8h RA, south of 0 Dec * > 10° from the Galactic plane, 20° from Galactic center * Detected on all four SuperCOSMOS plates * Ellipticity less than 0.2 on all four plates * Brighter than 16.5 in UKST R59F. * Detected in 2MASS in all three bands * All four detections within 5” * Plate magnitude distance within 25 parsecs * In our color-color boxes around the main sequence * | UKST R59F (R2) - ESO R (R1) | < 1 mag * J-K color < 1.2 ~1 billion ~ 6 million = 30,326 (black)‏ = 483 (colors)‏ = 338 (green & blue)‏ FOUR PRELIMINARY PARALLAX RESULTS‏ Green Circles, open: Stars that have passed all our sifts, believed to be within 25 parsecs Green Circles, closed: As above, with CCD-based distances also within 25 parsecs Blue Circles, open: Stars that have passed all our sifts, with known X-ray emission according to ROSAT surveys Blue Circles, closed: The same, with CCD-based distances also within 25 parsecs Yellow Circles, open: Stars that have not passed our J-K and R1-R2 based sort Yellow Circles, closed: A subset that have CCD distance estimates within 25 parsecs (sometimes improbably close)‏ Red Circles, open: Corrected photometry has pushed these stars either out of our color boxes or farther than 25 parsecs Red Circles, closed: Known giants (by SIMBAD)‏ The boxes have been made based on the positions of known nearby main-sequence stars (the black line is a fifth-order polynomial fit), with the later M stars snaking through box 3, and potential brown dwarfs in box 2. Note that the giants and main sequence intersect in boxes 2 and 3. We have identified the stars with detectable X-ray flux from ROSAT (1st ROSAT X Survey) on the hypothesis that normal giants do not produce many X-rays; all such stars are expected to be UV Ceti variables with active chromospheres or, potentially, young stars. The young stars to the right have X-ray flux (#1) roughly comparable to GJ 799AB (AT Mic), a known young system at 10 parsecs; and (#2) slightly more than AP Col, another known young system at 9 parsecs. TINYMO (< 0.18”/yr)‏ 370 MINIMO (0.18 - 0.4”/yr)‏ 113 TINYMO SAMPLE (483 TARGETS)‏ REFERENCES: Hambly et al. 2004 AJ 128 437 Hambly et al. 2001 MNRAS 326 1279 Song, Inseok (private communication)‏ Subasavage et al. 2005 AJ 129 413 Voges et al.1999 A&A 349 389 This research has made use of the SIMBAD and VizieR databases, operated at CDS, Strasbourg, France New SCR discoveries 287 Previously known stars 196 ? 219 Dwarfs 2 ? 129 Giants 55 X-Rays 9 Dwarfs 14 X-Rays 66 Giants 2