期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 480, 期 3, 页码 3942-3961出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2057
关键词
Hertzsprung; magnitude diagrams; stars: statistics; white dwarfs; Russell and colour
资金
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013) / ERC Grant [320964]
- European Union's Horizon 2020 research and innovation programme [677706]
- Gaia MultiLateral Agreement (MLA)
- STFC [ST/M006492/1, ST/P000495/1] Funding Source: UKRI
Using Gaia DR2 data, we present an up-to-date sample of white dwarfs within 20 pc of the Sun. In total we identified 139 systems in Gala DR2, nine of which are new detections, with the closest of these located at a distance of 13.05 pc. We estimated atmospheric parameters for all stellar remnants based on the Gaia parallaxes and photometry. The high precision and completeness of the Gaia astrometry allowed us to search for wide binary companions. We re-identified all known binaries where both components have accurate DR2 astrometry, and established the binarity of one of the nine newly identified white dwarfs. No new companions were found to previously known 20 pc white dwarfs. Finally, we estimated the local white dwarf space-density to be (4.49 +/- 0.38) x 10(-3) pc(-3), having given careful consideration to the distance-dependent Gaia completeness, which misses known objects at short distances, but is close to complete for white dwarfs near 20 pc.
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