期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 434, 期 4, 页码 2727-2741出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1005
关键词
surveys; stars: general; white dwarfs; ISM: general; Galaxy: disc; Galaxy: stellar content
资金
- NWO-EW [614.000.601]
- NOVA
- Science and Technology Facilities Council [ST/J001333/1, ST/L001381/1, PP/D005914/1, ST/J001600/1, ST/I001425/1, ST/I001719/1] Funding Source: researchfish
- STFC [ST/L001381/1, PP/D005914/1, ST/J001333/1, ST/J001600/1, ST/I001719/1, ST/I001425/1] Funding Source: UKRI
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 T-eff > 10 000 K (M-V < 12.2) of (3.8 +/- 1.1) x 10(-4) pc(-3), and an average DA white dwarf birth rate over the last 7x10(7) yr of (5.4 +/- 1.5) x 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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