Spectrophotometric analysis of magnetic white dwarf I: Hydrogen-rich compositions

Abstract

We present an homogeneous analysis of all DA stars labeled as magnetic in the Montreal White Dwarf Database (MWDD). Our sample is restricted to almost all known magnetic white dwarf showing clear sign of splitting ($B\gtrsim$ 1-2 MG) that have parallax measurements from the second Gaia data release, photometric data from diverse surveys and spectroscopic data from SDSS or archival data from the Montreal group. We determine the atmospheric parameters (effective temperature, surface gravity, magnetic field strength/geometry) of all objects using state-of-the-art model atmosphere/magnetic synthetic spectra, as well as reclassify many objects that were prematurely labeled as potentially magnetic. Finally, we discuss the atmospheric parameters/field properties distribution as well as the implication on our understanding of magnetic white dwarfs origin and evolution.

140 pages. Part 1 of 2. To be published in Monthly Notices of the Royal Astronomical Society

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Cited by in corpus (20)

• The 40 pc sample of white dwarfs from Gaia
• Magnetic field breakout from white dwarf crystallization dynamos
• Data-Driven Selection and Spectral Classification of White Dwarf Stars
• A rotating white dwarf shows different compositions on its opposite faces
• Rotation at the Fully Convective Boundary: Insights from Wide WD + MS Binary Systems
• Magnetic field evolution for crystallization-driven dynamos in C/O white dwarfs
• Spectrophotometric analysis of magnetic white dwarf II: Helium-rich compositions
• Unveiling complex magnetic field configurations in red giant stars
• Two New White Dwarfs With Variable Magnetic Balmer Emission Lines
• An emerging and enigmatic spectral class of isolated DAe white dwarfs
• Signs of Binary Evolution in 7 Magnetic DA White Dwarfs
• Identification of new nearby white dwarfs using Gaia DR3
• Atmospheric heating and magnetism driven by ${}^{22}$Ne distillation in isolated white dwarfs
• 84 Second and 169 Second Rotation of Two Isolated, Ultramassive, Strongly Magnetic White Dwarfs
• Younger age for the oldest magnetic white dwarfs
• A numerical code for the analysis of magnetic white dwarf spectra that includes field effects on the chemical equilibrium
• Evolution of a Long-Lived Deep-Seated Main-Sequence Magnetic Field During White Dwarf Cooling
• Identifying highly magnetized white dwarfs: A dimensionality reduction framework for estimating magnetic fields
• Strong signature of right-handed circularly polarized photoionization close to the cyclotron line in the atmosphere of magnetic white dwarfs
• Magneto-Archeology of White Dwarfs. Revisiting the fossil field scenario with observational constraints during the red giant branch