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The kinematics of white dwarfs from the SDSS DR12

Published online by Cambridge University Press:  02 August 2018

E. García–Berro ,
G. Skorobogatov ,
S. Torres ,
B. Anguiano  and
A. Rebassa-Mansergas
E. García–Berro
Affiliation:
Departamento de Física, Universidad Politécnica de Cataluña, c/Esteve Terrades, 5, 08860 Castelldefels, Spain email: [email protected] Instituto de Estudios Espaciales de Cataluña, c/Gran Capitán 2–4, Edificio Nexus 201, 08034 Barcelona, Spain
G. Skorobogatov
Affiliation:
Departamento de Física, Universidad Politécnica de Cataluña, c/Esteve Terrades, 5, 08860 Castelldefels, Spain email: [email protected] Instituto de Estudios Espaciales de Cataluña, c/Gran Capitán 2–4, Edificio Nexus 201, 08034 Barcelona, Spain
S. Torres
Affiliation:
Departamento de Física, Universidad Politécnica de Cataluña, c/Esteve Terrades, 5, 08860 Castelldefels, Spain email: [email protected] Instituto de Estudios Espaciales de Cataluña, c/Gran Capitán 2–4, Edificio Nexus 201, 08034 Barcelona, Spain
B. Anguiano
Affiliation:
Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325, USA
A. Rebassa-Mansergas
Affiliation:
Departamento de Física, Universidad Politécnica de Cataluña, c/Esteve Terrades, 5, 08860 Castelldefels, Spain email: [email protected] Instituto de Estudios Espaciales de Cataluña, c/Gran Capitán 2–4, Edificio Nexus 201, 08034 Barcelona, Spain
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Abstract

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We use the Sloan Digital Sky Survey Data Release 12, which is the largest available white dwarf catalogue to date, to study the evolution of the kinematical properties of the population of white dwarfs of the Galactic disk. We derive masses, ages, photometric distances and radial velocities for all white dwarfs with hydrogen-rich atmospheres. For those stars for which proper motions from the USNO-B1 catalogue are available, the three-dimensional components of the velocity are obtained. This subset of the original sample comprises 20,247 stars, making it the largest sample of white dwarfs with measured three-dimensional velocities. The volume probed by our sample is large, allowing us to obtain relevant kinematical information. In particular, our sample extends from a Galactocentric radial distance RG = 7.8 to 9.3 kpc, and vertical distances from the Galactic plane ranging from Z = +0.5 to –0.5 kpc.

Keywords

stars: kinematicsstars: white dwarfsGalaxy: fundamental parametersGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 294 - 295
Copyright
Copyright © International Astronomical Union 2018 

References

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