A new detailed examination of white dwarfs in NGC3532 and NGC2287

Abstract

We present the results of a photometric and spectroscopic study of the white dwarf candidate members of the intermediate age open clusters NGC3532 and NGC2287. Of the nine objects investigated, it is determined that six are probable members of the clusters, four in NGC3532 and two in NGC2287. For these six white dwarfs we use our estimates of their cooling times together with the cluster ages to constrain the lifetimes and masses of their progenitor stars. We examine the location of these objects in initial mass-final mass space and find that they now provide no evidence for substantial scatter in initial mass-final mass relation as suggested by previous investigations. Instead, we demonstrate that, when combined with current data from other solar metalicity open clusters and the Sirius binary system, they hint at an IFMR that is steeper in the initial mass range 3M${}_{\odot }$$\simless$M${}_{\mathrm{init}}$$\simless$4M${}_{\odot }$ than at progenitor masses immediately lower and higher than this. This form is generally consistent with the predictions of stellar evolutionary models and can aid population synthesis models in reproducing the relatively sharp drop observed at the high mass end of the main peak in the mass distribution of white dwarfs.

accepted for publication in MNRAS

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• The white dwarf luminosity function
• High Mass-ratio Binary Population in Open Clusters: Segregation of early type binaries and an increasing binary fraction with mass
• Spectroscopic membership for the populous 300 Myr-old open cluster NGC 3532
• The Planetary Nebula in the 500 Myr old Open Cluster M37
• The White Dwarfs of the Old, Solar Metallicity Open Star Cluster Messier 67: Properties and Progenitors
• White dwarf-open cluster associations based on Gaia DR2
• Component masses of young, wide, non-magnetic white dwarf binaries in the SDSS DR7
• Population of X-ray Sources in the Intermediate-Age Cluster NGC 3532: a Test Bed for Machine-Learning Classification
• Hubble Space Telescope Imaging and Spectroscopy of the Sirius-Like Triple Star System HD 217411