New Hot Subdwarf Variables from Gaia eDR3

Isaac D. Lopez; Alekzander Kosakowski; Brad N. Barlow; Thomas Kupfer

doi:10.25518/0037-9565.11220

Bulletin de la Société Royale des Sciences de Liège

0037-9565 1783-5720

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Isaac D. Lopez, Alekzander Kosakowski, Brad N. Barlow & Thomas Kupfer

New Hot Subdwarf Variables from Gaia eDR3

(Volume 92 - Année 2023 — Numéro 2 - Proceedings of the 10th Meeting on Hot Subdwarfs and Related Objects)

DOI: 10.25518/0037-9565.11220

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Abstract

We present a search for new variable hot subdwarfs from Gaia eDR3 using the Zwicky Transient Facility DR9 and the 2.1 m Otto Struve Telescope at McDonald Observatory. We report the discovery of 22 HW Vir binaries, 24 reflection effect binaries, and 14 ellipsoidally modulated systems. Candidate selection for our high-speed observations was based on object location on the Gaia color-magnitude diagram and on intrinsic variability, which we estimate from the Gaia G flux uncertainties. Notable discoveries include a candidate 72 min period sdB+WD binary and two short period HW Vir binaries with periods around 67 min and 79 min, which includes the shortest-period eclipsing sdB+dM/BD discovered to date.

Om dit artikel te citeren:

Isaac D. Lopez, Alekzander Kosakowski, Brad N. Barlow & Thomas Kupfer, «New Hot Subdwarf Variables from Gaia eDR3», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 92 - Année 2023, Numéro 2 - Proceedings of the 10th Meeting on Hot Subdwarfs and Related Objects, 39-61 URL : https://popups.uliege.be/0037-9565/index.php?id=11220.

Over : Isaac D. Lopez

Department of Physics and Astronomy, Iowa State University, Ames, IA 50011, USA and Department of Physics, High Point University, High Point, NC 27268, USA. Corresponding author: idlopez@iastate.edu