# Gaia white dwarfs within 40 pc – I. Spectroscopic observations of new candidates

@article{Tremblay2020GaiaWD,
title={Gaia white dwarfs within 40 pc – I. Spectroscopic observations of new candidates},
author={P.-E. Tremblay and Mark Andrew Hollands and Nicola Pietro Gentile Fusillo and J. E. McCleery and Paula Izquierdo and Boris T. Gansicke and Elena Cukanovaite and Detlev Koester and Warren R. Brown and S. Charpinet and Tim Cunningham and Jay Farihi and Noemi Giammichele and Val{\'e}rie Van Grootel and J. J. Hermes and M Hoskin and Stefan Jordan and S. O. Kepler and Scott J. Kleinman and Christopher J. Manser and Thomas R. Marsh and Domitilla de Martino and Atsuko Nitta and Steven G Parsons and Ingrid Pelisoli and Roberto Raddi and Alberto Rebassa-Mansergas and J.-J. Ren and Matthias R Schreiber and Roberto Silvotti and Odette Toloza and Silvia Toonen and Santiago Torres},
journal={Monthly Notices of the Royal Astronomical Society},
year={2020},
volume={497},
pages={130-145}
}
• P. Tremblay, +30 authors S. Torres
• Published 2020
• Physics
• Monthly Notices of the Royal Astronomical Society
We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio Canarias. All candidates were selected from $\textit{Gaia}$ Data Release 2 (DR2) and in almost all cases had no prior spectroscopic classifications. We find a total of 191 confirmed white dwarfs and 39 main-sequence star contaminants. The majority of stellar remnants in the sample are relatively cool ($\langle T_{\rm eff} \rangle$ = 6200 K), showing… Expand

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#### References

SHOWING 1-10 OF 115 REFERENCES
Discovery of a Sirius-like binary system with a very strongly magnetic white dwarf
• Physics
• 2020
Binary systems containing a magnetic white dwarf and a main-sequence star are considered extremely rare, perhaps non-existent. In the course of a search of magnetic fields in high-mass white dwarfsExpand
Physical Properties of the Current Census of Northern White Dwarfs within 40 pc of the Sun
• Physics
• 2015
We present a detailed description of the physical properties of our current census of white dwarfs within 40 pc of the Sun, based on an exhaustive spectroscopic survey of northern hemisphereExpand
A New Generation of Cool White Dwarf Atmosphere Models. III. WD J2356–209: Accretion of a Planetesimal with an Unusual Composition
• Physics
• The Astrophysical Journal
• 2019
WD. J2356-209 is a cool metal-polluted white dwarf whose visible spectrum is dominated by a strong and broad sodium feature. Although it was discovered nearly two decades ago, no detailed andExpand
A New Generation of Cool White Dwarf Atmosphere Models. IV. Revisiting the Spectral Evolution of Cool White Dwarfs
• Physics
• The Astrophysical Journal
• 2019
As a result of competing physical mechanisms, the atmospheric composition of white dwarfs changes throughout their evolution, a process known as spectral evolution. Because of the ambiguity of theirExpand
• Mem. Soc. Astron. Italiana
• 2010
Fits to the normalised Balmer lines for 40 DA and DAZ white dwarfs (continued 2/2)
• MNRAS 000,
• 2020
Analysis of Helium-rich White Dwarfs Polluted by Heavy Elements in the Gaia Era
We present a homogeneous analysis of 1023 DBZ/DZ(A) and 319 DQ white dwarf stars taken from the Montreal White Dwarf Database. This represents a significant increase over the previous comprehensiveExpand
Discovery of kilogauss magnetic fields on the nearby white dwarfs WD 1105–340 and WD 2150+591
• Physics
• Astronomy & Astrophysics
• 2019
Magnetic fields are present in roughly 10% of white dwarfs. These fields affect the structure and evolution of such stars, and may provide clues about their earlier evolution history. ParticularlyExpand
The long-term polarimetric variability of the strongly magnetic white dwarf Grw+70° 8247
• Physics
• Monthly Notices of the Royal Astronomical Society
• 2019
Some of the white dwarfs exhibit among the strongest magnetic fields in the universe. Many of these degenerate magnetic stars are also rotating very slowly. Among these objects, Grw+70$^\circ$\,8247,Expand
A New Generation of Cool White Dwarf Atmosphere Models. II. A DZ Star with Collision-induced Absorption
• Physics
• 2018
In the first paper of this series (Blouin et al. 2018), we presented our upgraded cool white dwarf atmosphere code. In this second paper, we use our new models to analyze SDSS J080440.63+223948.6Expand