|   | 
				
					
	
		  | 
	 
	
		| Paper: | 
		The Interstellar Reddening Law within 3kpc from the Sun | 
	 
	
		| Volume: | 
		482, 10th Pacific Rim Conference on Stellar Astrophysics | 
	 
	
		| Page: | 
		275 | 
	 
	
		| Authors: | 
		Sung, H.; Bessell, M. S. | 
	 
	
	
		| Abstract: | 
		We have investigated the interstellar reddening law of young open clusters within 3kpc from the Sun using optical, near-IR 2MASS, and  Spitzer IRAC data. The total-to-selective extinction ratio RV of 162 young open clusters (log  tage≲ 7.3) listed in the open cluster database WEBDA were determined from their color excess ratios. The young open clusters in the Sgr-Car  arm show a relatively high value (RV≈3.2), those in the Per arm and in the Cygnus region have a smaller value (RV≈2.9),  and those in the Mon-CMa regions have a nearly normal value (RV≈3.1). | 
	 
	
		| 
			
			
		 | 
	 
	
		  | 
	 
 
					 
				 | 
				  |