Dwarfs Cooler than “M”: The Definition of Spectral Type “L” Using Discoveries from the 2 Micron All‐Sky Survey (2MASS)

Before the 2-Micron All-Sky Survey (2MASS) began, only six objects were known with spectral types later than M9.5 V. In the first 371 deg2 of actual 2MASS survey data, we have identified another 20 such objects spectroscopically confirmed using the Low Resolution Imaging Spectrograph (LRIS) at the W... View More