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

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.

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.

Green Circles, open: Stars that have passed all our sifts, Green Circles, open: Stars that have passed all our sifts, believed to be within 25 parsecsbelieved 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 Blue Circles, open: Stars that have passed all our sifts, with known X-ray emission according to ROSAT surveysknown 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 Yellow Circles, open: Stars that have not passed our J-K and R1-R2 based sortR1-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 Red Circles, open: Corrected photometry has pushed these stars either out of our color boxes or farther than 25 stars either out of our color boxes or farther than 25 parsecsparsecs

Red Circles, closed: Known giants (by SIMBAD)

= 338 (green & blue)

= 483 (colors)= 30,326 (black)~ 6 million

~1 billion

FOUR PRELIMINARY PARALLAX RESULTS

REFERENCES:Hambly et al. 2004 AJ 128 437Hambly et al. 2001 MNRAS 326 1279Song, Inseok (private communication)Subasavage et al. 2005 AJ 129 413Voges et al.1999 A&A 349 389

This research has made use of the SIMBAD and VizieR databases, operated at CDS, Strasbourg, France

TINYMO SAMPLE (483 TARGETS)

New SCR discoveries287

Previously known stars196

Giants55

Dwarfs14

Giants2

Dwarfs2

TINYMO (< 0.18”/yr)370

X-Rays66

?129

MINIMO (0.18 - 0.4”/yr)113

?219

X-Rays9

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.