Ngeow, Chow-Choong and Bhardwaj, Anupam and Reiley, Daniel and Laher, Russ R. and Purdum, Josiah and Rusholme, Ben (2022) Zwicky Transient Facility and Globular Clusters: Calibration of the gr-band Absolute Magnitudes for the Yellow Post-asymptotic-giant-branch Stars. Astronomical Journal, 164 (4). Art. No. 166. ISSN 0004-6256. doi:10.3847/1538-3881/ac8a49. https://resolver.caltech.edu/CaltechAUTHORS:20221010-454096500.4
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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.
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| Additional Information: | We thank M. M. Miller Bertolami for sharing the theoretical evolutionary tracks, and the useful comments from an anonymous referee that improved the manuscript. We are thankful for funding from the Ministry of Science and Technology (Taiwan) under the contracts 107-2119-M-008-014-MY2, 107-2119-M-008-012, 108-2628-M-007-005-RSP, and 109-2112-M-008-014-MY3. Based on observations obtained with the Samuel Oschin Telescope 48 inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. Z.T.F. is supported by the National Science Foundation under grant Nos. AST-1440341 and AST-2034437 and a collaboration including current partners Caltech, IPAC, the Weizmann Institute of Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, IN2P3, University of Warwick, Ruhr University Bochum, Northwestern University and former partners the University of Washington, Los Alamos National Laboratories, and Lawrence Berkeley National Laboratories. Operations are conducted by COO, IPAC, and UW. | ||||||||||||||||
| Group: | Infrared Processing and Analysis Center (IPAC), Zwicky Transient Facility | ||||||||||||||||
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| Issue or Number: | 4 | ||||||||||||||||
| DOI: | 10.3847/1538-3881/ac8a49 | ||||||||||||||||
| Record Number: | CaltechAUTHORS:20221010-454096500.4 | ||||||||||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20221010-454096500.4 | ||||||||||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||||||
| ID Code: | 117291 | ||||||||||||||||
| Collection: | CaltechAUTHORS | ||||||||||||||||
| Deposited By: | Research Services Depository | ||||||||||||||||
| Deposited On: | 14 Oct 2022 22:16 | ||||||||||||||||
| Last Modified: | 14 Oct 2022 22:16 |
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