Zwicky Transient Facility and Globular Clusters: Calibration of the gr-band Absolute Magnitudes for the Yellow Post-asymptotic-giant-branch Stars

Chow Choong Ngeow, Anupam Bhardwaj, Daniel Reiley, Russ R. Laher, Josiah Purdum, Ben Rusholme

Research output: Contribution to journalArticlepeer-review

Abstract

We present the first absolute calibration for the yellow post-asymptotic-giant-branch (PAGB) stars in the g and r band based on time-series observations from the Zwicky Transient Facility. These absolute magnitudes were calibrated using four yellow PAGB stars (one nonvarying star and three Type II Cepheids) located in the globular clusters. We provide two calibrations of the gr-band absolute magnitudes for the yellow PAGB stars, by using an arithmetic mean and a linear regression. We demonstrate that the linear regression provides a better fit to the g-band absolute magnitudes for the yellow PAGB stars. These calibrated gr-band absolute magnitudes have a potential to be used as Population II distance indicators in the era of time-domain synoptic sky surveys.

Original languageEnglish
Article number166
JournalAstronomical Journal
Volume164
Issue number4
DOIs
StatePublished - 1 Oct 2022

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