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White dwarf kinematics versus mass

Wegg, Christopher and Phinney, E. Sterl (2012) White dwarf kinematics versus mass. Monthly Notices of the Royal Astronomical Society, 426 (1). pp. 427-439. ISSN 0035-8711.

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We investigated the relationship between the kinematics and mass of young (<3 × 10^8 yr) white dwarfs using proper motions. Our sample is taken from the colour-selected catalogues of the Sloan Digital Sky Survey and the Palomar–Green Survey, both of which have spectroscopic temperature and gravity determinations. We find that the dispersion decreases with increasing white dwarf mass. This can be explained as a result of less scattering by objects in the Galactic disc during the shorter lifetime of their more massive progenitors. A direct result of this is that white dwarfs with high mass have a reduced scale height, and hence their local density is enhanced over their less massive counterparts. In addition, we have investigated whether the kinematics of the highest mass white dwarfs (>0.95 M_⊙) are consistent with the expected relative contributions of single star evolution and mergers. We find that the kinematics are consistent with the majority of high-mass white dwarfs being formed through single star evolution.

Item Type:Article
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URLURL TypeDescription Paper
Phinney, E. Sterl0000-0002-9656-4032
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 May 24. Received 2012 May 24; in original form 2011 July 4. Article first published online: 18 Sep. 2012. CW gratefully acknowledges many useful discussions with Nate Bode. Support for this work was provided by NASA BEFS grant NNX-07AH06G.
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Subject Keywords:white dwarfs – Galaxy: kinematics and dynamics
Issue or Number:1
Record Number:CaltechAUTHORS:20121101-102542242
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Official Citation:Wegg, C. and Phinney, E. S. (2012), White dwarf kinematics versus mass. Monthly Notices of the Royal Astronomical Society, 426: 427–439. doi: 10.1111/j.1365-2966.2012.21394.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35232
Deposited By: Tony Diaz
Deposited On:01 Nov 2012 23:05
Last Modified:19 May 2020 22:14

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