The Amateur Astronomer's Library

Part I: UKIDSS LAS DR5 vs SDSS DR7

The article can be accessed from here -
http://arxiv.org/abs/1204.4328

Key features of the article.
1) Plotting photometric results - as a colour/colour diagram - from UKIDSS (J-Ks)v UKIDSS/SDSS (i-J) allows the various M-type dwarf stars to be distinguished. The (i-J)value is particularly sensitive in this context.
2) Searching for cool and ultra-cool stars should be possible by linking the SDSS/2MASS results using SQL
http://skyserver.sdss3.org/public/en/help/browser/browser.asp
3) Reduced Proper Motion (Hr) can be used as a proxy for metallicity.

OVERALL SCORE - Four Stars