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Open AccessJournal ArticleDOI

Hot Degenerates in the MCT Survey. III. A Sample of White Dwarf Stars in the Southern Hemisphere

TLDR
In this paper, the optical spectra of 144 white dwarfs detected in the Montreal-Cambridge-Tololo (MCT) colorimetric survey were presented, including 120 DA, 12 DB, 4 DO, 1 DQ, and 7 DC stars.
Abstract
We present optical spectra of 144 white dwarfs detected in the Montreal-Cambridge-Tololo (MCT) colorimetric survey, including 120 DA, 12 DB, 4 DO, 1 DQ, and 7 DC stars. We also perform a model atmosphere analysis of all objects in our sample using the so-called spectroscopic technique, or the photometric technique in the case of DC white dwarfs. The main objective of this paper is to contribute to the ongoing effort of confirming spectroscopically all white dwarf candidates in the Gaia survey, in particular in the southern hemisphere. All our spectra are made available in the Montreal White Dwarf Database.

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Journal ArticleDOI

Discovery of magnetic fields in five DC white dwarfs

TL;DR: In this paper , the authors use broadband filter polarimetry, arguably the most efficient way to detect magnetic fields in featureless WDs via continuum circular polarization, to confirm the existence of magnetism in five DC-type WDs.
Journal ArticleDOI

Two substellar survivor candidates; one found and one missing

TL;DR: In this article , the authors present observations of two possible substellar survivors of post-main sequence engulfment, currently orbiting white dwarf stars, which suggest all closelyorbiting giant planets are consumed, which may contribute to mass loss and magnetic field generation in white dwarfs and their immediate progenitors.
Journal ArticleDOI

Data-Driven Selection and Spectral Classification of White Dwarf Stars

TL;DR: In this article , a data-driven pipeline for fast, automatic selection and spectroscopic classification of white dwarf (WD) candidates is proposed, trained using spectroscopically confirmed objects with available Gaia astrometry, photometry, and SDSS spectra with signal-to-noise ratios ≥ 9.
References
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Journal ArticleDOI

Gaia Data Release 2: Observational Hertzsprung-Russell diagrams

C. Babusiaux, +451 more
TL;DR: In this article, the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagram (HRD) was highlighted, depending in particular on stellar population selections.
Journal ArticleDOI

Gaia Data Release 2 - Observational Hertzsprung-Russell diagrams

C. Babusiaux, +451 more
TL;DR: Gaia Data Release 2 provides high-precision astrometry and three-band photometry for about 1.3 billion sources over the full sky as mentioned in this paper, which is unprecedented in both precision and coverage of the various Milky Way stellar populations and stellar evolutionary phases.
Journal ArticleDOI

The Palomar-Green Catalog of Ultraviolet-Excess Stellar Objects

TL;DR: In this paper, the authors present le catalogue de Stromgren et al. which donne les positions avec une precision de 8'', les magnitudes photographiques B a 0,29 mag pres, les types spectraux, des references and les couleurs de Stemgren, and 1715 constituent un echantillon statistiquement complet couvrant 10714 degres carres de 266 champs du Palomar
Journal ArticleDOI

A spectroscopic determination of the mass distribution of DA white dwarfs

TL;DR: In this paper, a mass distribution for a sample of 129 DA white dwarfs is presented, based on fitting hydrogen line profiles to the predictions of stellar atmosphere models, and the atmospheric parameters determined from spectroscopy are shown to be of improved accuracy over those obtained with other techniques.
Journal ArticleDOI

The Formation Rate and Mass and Luminosity Functions of DA White Dwarfs from the Palomar Green Survey

TL;DR: In this paper, the mass distribution of DA white dwarfs from the Palomar Green (PG) survey was derived and the luminosity function of the sample, weighted by 1/Vmax, was obtained and compared with other determinations.
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