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Searching for ZZ Ceti white dwarfs in the Gaia survey

Published online by Cambridge University Press:  09 October 2020

Olivier Vincent Open the ORCID record for Olivier Vincent [Opens in a new window] ,
Pierre Bergeron  and
David Lafrenière
Olivier Vincent
Affiliation:
Département de Physique, Université de Montréal, Montréal, Québec, H3T 1J4 emails: [email protected], [email protected], [email protected]
Pierre Bergeron
Affiliation:
Département de Physique, Université de Montréal, Montréal, Québec, H3T 1J4 emails: [email protected], [email protected], [email protected]
David Lafrenière
Affiliation:
Département de Physique, Université de Montréal, Montréal, Québec, H3T 1J4 emails: [email protected], [email protected], [email protected]
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Abstract

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The Gaia satellite recently released parallax measurements for nearly 400,000 white dwarf stars, allowing for precise measurements of their physical parameters. By combining these parallaxes with Pan-STARRS and CFIS-u photometry, we measured the effective temperatures and surface gravities for all white dwarfs within 100 pc and identified a sample of ZZ Ceti white dwarf candidates within the instability strip. We report the results of a photometric follow-up, currently under way, aimed at identifying new ZZ Ceti stars among this sample using the PESTO camera attached to the 1.6-m telescope at the Mont Mégantic Observatory. Our goal is to verify that ZZ Ceti stars occupy a region in the logg-Teff plane where no nonvariable stars are found, supporting the idea that ZZ Ceti pulsators represent a phase through which all hydrogen-line (DA) white dwarfs must evolve.

Keywords

white dwarfsstars: variablesurveystechniques: photometric
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. 123 - 126
Copyright
© International Astronomical Union 2020

References

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