A 3 micron Survey of the Chamaeleon I Dark Cloud

KENYON, S., GÓMEZ, M.

ASTRONOMICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2001 p. 2673 - 2680

0004-6256

We describe an L-band photometric survey of ~ 0.5 deg^2 of the Chamaeleon I dark cloud. The survey has a completeness limit of L<11.0. Our survey detects 124 sources, including all known pre-main-sequence stars with L<=11. The fraction of sources with near-IR excess emission is 58%+/-4% for K=9-11. Cha I sources have bluer H-K and K-L colors than pre-main-sequence stars in Taurus-Auriga. These sources also have a strong correlation between EW(Há) and K-L. Stars with K-L<=0.6 have weak Há emission; stars with K-L>=0.6 have strong Há emission. Because many Cha I sources are heavily reddened, this division between weak emission T Tauri stars and classical T Tauri stars occurs at a redder K-L than in Taurus-Auriga.