Near-infrared Extinction Law in the Ophiuchi and Chamaeleon Dark Clouds


We determine and compare the color excess ratios EJ H /EH KS for the Ophiuchi and Chamaeleon dark clouds with the J -, H-, and Ks-band simultaneous camera, SIRIUS, on the IRSF 1.4 m telescope at SAAO. Determining accurate ratios is indispensable for discussions of the extinction law. However, previous surveys suffered from uncertainties in transforming one… (More)