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Two massive white dwarfs from NGC 2323 and the initial-final mass relation for progenitors 4–6.5M⊙
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Cummings, Jeffrey D., Kalirai, Jason S., Tremblay, Pier-Emmanuel and Ramirez-Ruiz, Enrico (2016) Two massive white dwarfs from NGC 2323 and the initial-final mass relation for progenitors 4–6.5M⊙. The Astrophysical Journal, 818 (1). 84. doi:10.3847/0004-637X/818/1/84 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.3847/0004-637X/818/1/84
Abstract
We observed a sample of 10 white dwarf candidates in the rich open cluster NGC 2323 (M50) with the Keck Low-Resolution Imaging Spectrometer. The spectroscopy shows eight to be DA white dwarfs, with six of these having high signal-to-noise ratio appropriate for our analysis. Two of these white dwarfs are consistent with singly evolved cluster membership, and both are high mass ~1.07 M⊙, and give equivalent progenitor masses of 4.69 M⊙. To supplement these new high-mass white dwarfs and analyze the initial–final mass relation (IFMR), we also looked at 30 white dwarfs from publicly available data that are mostly all high-mass ($\gtrsim 0.9$ M⊙). These original published data exhibited significant scatter, and to test if this scatter is true or simply the result of systematics, we have uniformly analyzed the white dwarf spectra and have adopted thorough photometric techniques to derive uniform cluster parameters for their parent clusters. The resulting IFMR scatter is significantly reduced, arguing that mass-loss rates are not stochastic in nature and that within the ranges of metallicity and mass analyzed in this work mass loss is not highly sensitive to variations in metallicity. Lastly, when adopting cluster ages based on Y2 isochrones, the slope of the high-mass IFMR remains steep and consistent with that found from intermediate-mass white dwarfs, giving a linear IFMR from progenitor masses between 3 and 6.5 M⊙. In contrast, when adopting the slightly younger cluster ages based on PARSEC isochrones, the high-mass IFMR has a moderate turnover near an initial mass of 4 M⊙.
Item Type: | Journal Article | |||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | White dwarf stars | |||||||||||||||||||||||||||
Journal or Publication Title: | The Astrophysical Journal | |||||||||||||||||||||||||||
Publisher: | Institute of Physics Publishing, Inc. | |||||||||||||||||||||||||||
ISSN: | 0004-637X | |||||||||||||||||||||||||||
Official Date: | 9 February 2016 | |||||||||||||||||||||||||||
Dates: |
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Volume: | 818 | |||||||||||||||||||||||||||
Number: | 1 | |||||||||||||||||||||||||||
Article Number: | 84 | |||||||||||||||||||||||||||
DOI: | 10.3847/0004-637X/818/1/84 | |||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||
Copyright Holders: | © 2016. The American Astronomical Society. All rights reserved. | |||||||||||||||||||||||||||
Date of first compliant deposit: | 18 January 2019 | |||||||||||||||||||||||||||
Date of first compliant Open Access: | 22 January 2019 | |||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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