An HST COS ultra-violet spectroscopic survey of 311 DA white dwarfs.I. Fundamental parameters and comparative studies

White dwarf studies carry significant implications across multiple fields of astrophysics, including exoplanets, supernova explosions, and cosmological investigations. Thus, accurate determinations of their fundamental parameters (Teff and log g) are of utmost importance. While optical surveys have...

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Bibliographic Details
Published in:arXiv.org 2023-09
Main Authors: Sahu, Snehalata, Gaensicke, Boris T, Pier-Emmanuel Tremblay, Koester, Detlev, Hermes, J J, Wilson, David J, Toloza, Odette, Hoskin, Matthew J, Farihi, Jay, Manser, Christopher J, Redfield, Seth
Format: Article
Language:English
Subjects:
Atmospheric models
Comparative studies
Explosions
Extrasolar planets
Hubble Space Telescope
Hydrogen
Interstellar extinction
Parameters
Photometry
Space telescopes
Spectroscopy
White dwarf stars
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Summary:White dwarf studies carry significant implications across multiple fields of astrophysics, including exoplanets, supernova explosions, and cosmological investigations. Thus, accurate determinations of their fundamental parameters (Teff and log g) are of utmost importance. While optical surveys have provided measurements for many white dwarfs, there is a lack of studies utilising ultraviolet (UV) data, particularly focusing on the warmer ones that predominantly emit in the UV range. Here, we present the medium-resolution far-UV spectroscopic survey of 311 DA white dwarfs obtained with Cosmic Origins Spectrograph (COS) onboard Hubble Space Telescope confirming 49 photometric Gaia candidates. We used 3D extinction maps, parallaxes, and hydrogen atmosphere models to fit the spectra of the stars that lie in the range 12 000 < Teff < 33 000 K, and 7
ISSN:2331-8422