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What can ISM and non-photospheric highly ionised lines in white dwarf spectra reveal about the β CMa tunnel?

Published online by Cambridge University Press:  09 October 2020

Nicolle L. Finch Open the ORCID record for Nicolle L. Finch [Opens in a new window] ,
S. P. Preval Open the ORCID record for S. P. Preval [Opens in a new window] ,
M. A. Barstow ,
S. L. Casewell ,
T. Ayres ,
B. Welsh ,
M. Bainbridge  and
N. Reindl
Nicolle L. Finch
Affiliation:
Physics and Astronomy Department, University of Leicester, LE1 7RH, Leicester, UK email: nlf7@le.ac.uk
S. P. Preval
Affiliation:
Physics and Astronomy Department, University of Leicester, LE1 7RH, Leicester, UK
M. A. Barstow
Affiliation:
Physics and Astronomy Department, University of Leicester, LE1 7RH, Leicester, UK
S. L. Casewell
Affiliation:
Physics and Astronomy Department, University of Leicester, LE1 7RH, Leicester, UK
T. Ayres
Affiliation:
Department of Astrophysical and Planetary Sciences, University of Colorado at Boulder, Boulder, CO80309, USA
B. Welsh
Affiliation:
Space Sciences Laboratory, University of California, 7 Gauss Way, Berkeley, CA94720, USA
M. Bainbridge
Affiliation:
Physics and Astronomy Department, University of Leicester, LE1 7RH, Leicester, UK
N. Reindl
Affiliation:
Institut für Physik und Astronomie, Universitätsstandort Golm, Haus 28, Karl-Liebknecht-Str. 24/25, 14467 Potsdam, Germany
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Abstract

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White dwarfs are useful objects with which to study the local interstellar medium (ISM). High ionisation state absorption features that cannot be attributed to the photosphere or the ISM have been observed along the line-of-sight to a number of white dwarf stars. Suggested origins of these lines include ionisation from past supernovae, stellar winds, circumstellar disks, photoionisation from nearby hot stars or also from the white dwarf itself. In this study we consider the origin of these non-photospheric highly ionised lines in two stars towards a rarefied region of the galaxy known as the extended β CMa Tunnel. We present preliminary results from our analysis of the first of these two stars.

Keywords

Interstellar mediumspectroscopy: white dwarfsatmospheres: white dwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S357: White Dwarfs as Probes of Fundamental Physics: Tracers of Planetary, Stellar and Galactic Evolution , October 2019 , pp. 220 - 224
Copyright
© International Astronomical Union 2020

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