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A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey

A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey
A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey
We present a determination of the average space density and birth rate of hydrogen-line (DA) white dwarfs within a radius of 1 kpc around the Sun, based on an observational sample of 360 candidate white dwarfs with g <19.5 and (g - r) <0.4, selected from the UV-Excess (UVEX) survey of the northern Galactic plane, in combination with a theoretical white dwarf population that has been constructed to simulate the observations, including the effects of reddening and observational selection effects. The main uncertainty in the derivation of the white dwarf space density and current birth rate lies in the absolute photometric calibration and the photometric scatter of the observational data, which influences the classification method on colours, the completeness and the pollution. Corrections for these effects are applied. We derive an average space density of DA white dwarfs with Teff > 10 000 K (MV <12.2) of (3.8 ± 1.1) × 10-4 pc-3, and an average DA white dwarf birth rate over the last 7×107 yr of (5.4 ± 1.5) × 10-13 pc-3 yr-1. Additionally, we show that many estimates of the white dwarf space density from different studies are consistent with each other, and with our determination here.
surveys, stars: general, white dwarfs, ISM: general, Galaxy: disc, Galaxy: stellar content
0035-8711
2727-2741
Verbeek, Kars
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Groot, Paul J.
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Nelemans, Gijs
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Scaringi, Simone
88701970-a1b9-41fe-bf55-886716ee3374
Napiwotzki, Ralf
572cfeb6-e1a8-4ead-bbdc-5f5dfebc73b4
Drew, Janet E.
6db64e66-bcef-4099-8ff3-3a746eff4281
Steeghs, Danny
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Casares, Jorge
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Corral-Santana, Jesus M.
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Gänsicke, Boris T.
e53b02f6-aee1-4f86-a12e-d56049f44fb1
González-Solares, Eduardo
848f8d4b-a9b7-40b0-8b4c-45d553c70c07
Greimel, Robert
29ff965d-a19b-44af-8163-fa802c35a8b8
Heber, Ulrich
8629b8ec-0ce1-4cf6-a755-f864df1ea96a
Irwin, Mike J.
a38a9b82-a106-45b9-bfe6-9663cdbc6618
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Wright, Nicholas J.
f4685b8d-7496-47dc-95f0-aba3f70fbccd
Zijlstra, Albert A.
ffe41d76-2612-4e51-bf0f-658e154a9f83
Verbeek, Kars
b79d1c40-2885-4558-8b98-96c8aa506c0a
Groot, Paul J.
4e8a3306-c19a-435f-bf03-be2bd029068d
Nelemans, Gijs
9ce7167f-7907-4de9-b833-4e3795856022
Scaringi, Simone
88701970-a1b9-41fe-bf55-886716ee3374
Napiwotzki, Ralf
572cfeb6-e1a8-4ead-bbdc-5f5dfebc73b4
Drew, Janet E.
6db64e66-bcef-4099-8ff3-3a746eff4281
Steeghs, Danny
f631b06c-3e33-4daa-8959-c41f188e9c38
Casares, Jorge
0d906434-0a47-4a73-bc1f-81421d411874
Corral-Santana, Jesus M.
fb4e6141-b9db-4962-a80e-c040783bd902
Gänsicke, Boris T.
e53b02f6-aee1-4f86-a12e-d56049f44fb1
González-Solares, Eduardo
848f8d4b-a9b7-40b0-8b4c-45d553c70c07
Greimel, Robert
29ff965d-a19b-44af-8163-fa802c35a8b8
Heber, Ulrich
8629b8ec-0ce1-4cf6-a755-f864df1ea96a
Irwin, Mike J.
a38a9b82-a106-45b9-bfe6-9663cdbc6618
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Wright, Nicholas J.
f4685b8d-7496-47dc-95f0-aba3f70fbccd
Zijlstra, Albert A.
ffe41d76-2612-4e51-bf0f-658e154a9f83

Verbeek, Kars, Groot, Paul J., Nelemans, Gijs, Scaringi, Simone, Napiwotzki, Ralf, Drew, Janet E., Steeghs, Danny, Casares, Jorge, Corral-Santana, Jesus M., Gänsicke, Boris T., González-Solares, Eduardo, Greimel, Robert, Heber, Ulrich, Irwin, Mike J., Knigge, Christian, Wright, Nicholas J. and Zijlstra, Albert A. (2013) A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey. Monthly Notices of the Royal Astronomical Society, 434 (4), 2727-2741. (doi:10.1093/mnras/stt1005).

Record type: Article

Abstract

We present a determination of the average space density and birth rate of hydrogen-line (DA) white dwarfs within a radius of 1 kpc around the Sun, based on an observational sample of 360 candidate white dwarfs with g <19.5 and (g - r) <0.4, selected from the UV-Excess (UVEX) survey of the northern Galactic plane, in combination with a theoretical white dwarf population that has been constructed to simulate the observations, including the effects of reddening and observational selection effects. The main uncertainty in the derivation of the white dwarf space density and current birth rate lies in the absolute photometric calibration and the photometric scatter of the observational data, which influences the classification method on colours, the completeness and the pollution. Corrections for these effects are applied. We derive an average space density of DA white dwarfs with Teff > 10 000 K (MV <12.2) of (3.8 ± 1.1) × 10-4 pc-3, and an average DA white dwarf birth rate over the last 7×107 yr of (5.4 ± 1.5) × 10-13 pc-3 yr-1. Additionally, we show that many estimates of the white dwarf space density from different studies are consistent with each other, and with our determination here.

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Published date: 1 October 2013
Keywords: surveys, stars: general, white dwarfs, ISM: general, Galaxy: disc, Galaxy: stellar content

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Local EPrints ID: 430092
URI: http://eprints.soton.ac.uk/id/eprint/430092
ISSN: 0035-8711
PURE UUID: b72f8e1a-e53d-4451-b68a-6f66b8916f1a
ORCID for Nicholas J. Wright: ORCID iD orcid.org/0000-0003-4884-2576

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Date deposited: 11 Apr 2019 16:30
Last modified: 27 Jan 2020 13:40

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Contributors

Author: Kars Verbeek
Author: Paul J. Groot
Author: Gijs Nelemans
Author: Simone Scaringi
Author: Ralf Napiwotzki
Author: Janet E. Drew
Author: Danny Steeghs
Author: Jorge Casares
Author: Jesus M. Corral-Santana
Author: Boris T. Gänsicke
Author: Eduardo González-Solares
Author: Robert Greimel
Author: Ulrich Heber
Author: Mike J. Irwin
Author: Albert A. Zijlstra

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