The Amateur Astronomer's Library

The article can be found here -
http://arxiv.org/abs/1302.1061

Key features of this article.
1) The paper explains how red dwarfs can be described in terms of their proper motion and SDSS/2MASS colour.
2) Red dwarf stars can be distinguished from red giants based on absolute magnitude and reduced proper motion diagrams.
3) Colour/colour diagrams for nearby red dwarfs based on GALEX and 2MASS

OVERALL SCORE - Three stars

The article can be found here -
http://arxiv.org/abs/1107.1350

Key features of the article
1) The wavelengths covered by the different filters are presented graphically.
2) The transformation between the different systems has been presented in an over-complex way. I am entirely unconvinced that knowing, for example, the B-V value would be a valid predictive tool for the W1-W2 value except in the broadest "on average" statistical terms.

OVERALL SCORE - Two stars

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