The open cluster NGC 2437 (Messier 46)

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Journal titlePublications of the Astronomical Society of the Pacific
Pages115125; # of pages: 11
AbstractThe stellar content of the open cluster NGC 2437 (Messier 46) is investigated using moderately deep u*, g′, and r′ MegaCam images. When compared with solar metallicity isochrones, the (g′; u′ - g′) and (r′; g′ - r′) CMDs are consistent with an age log(tyr) = 8:35 ± 0:15, a distance modulus μ0 = 11:05 ± 0:05, and a color excess E(B - V) = 0:115 ± 0:035. The r′ luminosity function (LF) of main sequence stars in the magnitude range r′ < 17 (i.e., masses ~0:8 Mȯ) has a shape that follows solar neighborhood star counts. However, at fainter magnitudes, the cluster LF is flat, in contrast with what would be expected from solar neighborhood counts. The clustering properties of stars in NGC 2437 are investigated by examining the two-point angular correlation functions of main sequence stars in different brightness ranges. Main sequence stars fainter than r′ = 17 are less centrally concentrated than brighter stars and are found over a larger area of the sky, suggesting that there is a corona of faint main sequence stars around NGC 2437. Based on the flat LF and extended spatial distribution of faint stars, it is concluded that NGC 2437 is actively shedding stars with masses ~0:8 Mȯ.© 2013. The Astronomical Society of the Pacific. All rights reserved.
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AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21270577
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Record identifier7fa862d6-ddcf-42cd-87e5-4e2e369080f7
Record created2014-02-17
Record modified2016-05-09
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