Investigation of open clusters based on IPHAS and APASS survey dataстатья
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Дата последнего поиска статьи во внешних источниках: 18 апреля 2017 г.
Аннотация:We adapt the classical Q-method based on a reddening-free parameter constructed from threepassband magnitudes to the filter set of Isaac Newton Telescope Photometric Hα Surveyand combine it with the maximum-likelihood-based cluster parameter estimator by Naylor& Jeffries (2006) to determine the extinction, heliocentric distances, and ages of young openclusters using Hαri data. The method is also adapted for the case of significant variations ofextinction across the cluster field. Our technique is validated by comparing the colour excesses,distances, and ages determined in this study with the most bona fide values reported for the18 well-studied young open clusters in the past and a fairly good agreement is found betweenour extinction and distance estimates and earlier published results, although our age estimatesare not very consistent with those published by other authors. We also show that individualextinction values can be determined rather accurately for stars with (r − i) > 0.1. Our resultsopen up a prospect for determining a uniform set of parameters for northern clusters basedon homogeneous photometric data, and for searching for new, hitherto undiscovered openclusters.