========================================================================== J/AJ/120/333 UBVRI and Halpha in NGC 6530 (Sung+, 2000) The following files can be converted to FITS (extension .fit .fgz or .fiZ) table1.dat table3.dat table4.dat table5.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/cgi-bin/VizieR?-source=J/AJ/120/333 ==========================================================================
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Beginning of ReadMe : J/AJ/120/333 UBVRI and Halpha in NGC 6530 (Sung+, 2000) ================================================================================ UBVRI and Halpha photometry of the young open cluster NGC 6530. Sung H., Chun M.-Y., Bessell M.S. <Astron. J. 120, 333 (2000)> =2000AJ....120..333S ================================================================================ ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, UBVRI ; Photometry, H-alpha ; Keywords: color-magnitude diagrams - open clusters and associations: individual (NGC 6530) - stars: early-type - stars: pre-main-sequence Abstract: New UBVRI and Halpha photometry has been obtained for the young open cluster NGC 6530 located 10' east of the Lagoon Nebula (M8). We found 37 pre-main-sequence (PMS) stars with Halpha emission and nine PMS candidates using the R-Halpha color, a measure of Halpha emission. From this new photometry we derived the cluster parameters (V_0_-M_V_=11.25+/-0.1mag and E(B-V)=0.35mag), typical age (1.5Myr), and an age spread of about 5Myr. We confirmed the presence of a small amount of differential reddening across the cluster. We also verified the abnormal reddening law for the cluster, especially for a heavily embedded O7 V star, Herschel 36. Comparisons were made for several PMS evolution models with regard to the resulting age distribution and the initial mass function.
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