TINYMO plots
As an overall introduction to the TINYMO project, here are some stats on how it started:
- Search of the southern sky in the SuperCOSMOS database (2 billion targets)
- Phase 1 (20h RA -> 8h RA) done September 2007
- Phase 2 (8h RA -> 20h RA) done May 2009
- Targets selected (30325 in TINYMO1, 58262 in TINYMO2) were:
- Farther than 10 degrees from the galactic plane and 20 degrees from the galactic bulge*
- Present on all four (UKST Bj, ESO R {R1}, UKST R {R2}, UKST I) plates and in 2MASS J, H, Ks
- Sources within 5" of each other on all plates
- Ellipticity less than 0.2 on all frames
- Brighter than magnitude 16.5 in R2
- Within 25 pc by B,R2,I,J,H,Ks plate distance relations (assuming single, main sequence stars)
- These targets were then run through a color-color sort (other objects were found by eye, or were matched to the wrong 2MASS point; in December 2008 the color-color boxes were rearranged putting a collection of objects around (1.0,4.5) out of the boxes)
- The 1216 remaining targets have all been checked for prior knowledge in SIMBAD and the General Catalog of Variable Stars.
- Not all systems discovered with this method are moving slower than 0.18"/yr
Stars between 2-15 pc that are not giants have been put on the CTIOPI photometry and astrometry programs, with special priority to X-ray detected objects.
All stars within 15 pc are being pursued with low-resolution spectroscopy to determine if they are giants (and, if possible, spectral type)
Current state of the Color-Color sort. The black line is a fifth-order fit to the main sequence within 10 pc; filled points have CCD photometry (unused here), v is the average of B and R2. As can be seen, NO stars have colors bluer than v-K=4.5, so we're looking at M2 and colder.
All plots use this color key and fill key
The same data plotted as J-H vs H-K; J-K vs H-K; and J-H vs J-K. None of these seem to cleanly separate dwarfs from giants, although they do suggest additional dwarfs I haven't picked up by other means (or bad 2MASS colors?).
Reduced PM diagram for the TINYMO sample. This both did and did not work. There are definitely dwarfs from the TINYMO search, but some of my most promising candidates are moving like giants. I have extracted all targets below the black line; nearly all are moving faster than 0.10"/yr, nearly all of those stars are already known to a proper motion search and many already have parallaxes in YPC or HIP (van Leeuwen). I may move the line upwards at the expense of more giant contamination.
Proper motion vectors for the TINYMO sample, lengths exaggerated by 180,000. For sanity's sake, only objects with CCD photometry are plotted here. No clustering is seen.
First parallax results for TINYMO targets. On this plot only, CCD photometry is used in the absolute magnitude determination. Since visiting Cool Stars 16 and meeting you guys, I recognize the cutoff of ROSAT fluxes around M4
Sky locations of the TINYMO objects. *Small chunks of TINYMO2 near the galactic bulge were removed (15-16h, -30d->-60d; 17h-18h, 00d->-30d); they contained more stars than the rest of the sample.