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|Title:||Praesepe and the seven white dwarfs|
|Authors:||Dobbie, P. D.|
Pinfield, D. J.
Hambly, N. C.
Burleigh, M. R.
Barstow, M. A.
Jameson, R. F.
|Publisher:||Oxford University Press (OUP), Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2004, 355 (4)|
|Abstract:||We report the discovery, from our preliminary survey of the Praesepe open cluster, of two new spectroscopically confirmed white dwarf candidate members. We derive the effective temperatures and surface gravities of WD0837+218 and WD0837+185 (LB5959) to be 17845+555−565 K and log g = 8.48+0.07−0.08 and 14170+1380−1590 K and log g = 8.46+0.15−0.16, respectively. Using theoretical evolutionary tracks we estimate the masses and cooling ages of these white dwarfs to be 0.92 ± 0.05 M⊙ and 280+40−30 Myr and 0.90 ± 0.10 M⊙ and 500+170−100 Myr, respectively. Adopting reasonable values for the cluster age we infer the progenitors of WD0837+218 and WD0837+185 had masses of 2.6 ≤M≤ Mcrit M⊙ and 2.4 ≤M≤ 3.5 M⊙, respectively, where Mcrit is the maximum mass of a white dwarf progenitor. We briefly discuss these findings in the context of the observed deficit of white dwarfs in open clusters and the initial mass–final mass relationship.|
|Rights:||Creative Commons “Attribution Non-Commercial No Derivatives” licence CC BY-NC-ND, further details of which can be found via the following link: http://creativecommons.org/licenses/by-nc-nd/4.0/ Archived with reference to SHERPA/RoMEO and publisher website.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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