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Name: Anupam Bhardwaj Affiliation: Kavli Institute for Astronomy and Astrophysics, China Conference ID: ASI2020_214 Title : Extragalactic distance scale with pulsating stars Authors and Co-Authors : Shashi Kanbur (SUNY Oswego, USA), Lucas Macri (Texas A&M, USA), Marina Rejkuba (ESO, Germany), H.P. Singh (Delhi University) Abstract Type : Oral Abstract Category : Extragalactic Astronomy Abstract : Pulsating stars such as Cepheid, RR Lyrae, and Miras are a sensitive probe of both stellar astrophysics and the cosmic distance scale. Cepheid variables, the primary standard candles, have been extensively used to estimate the Hubble constant which parametrizes the expansion rate of the Universe. I will briefly review the current tension in the Hubble constant measurements between the late and early Universe. I will summarize results on Cepheid variables from our near-infrared survey of the Large Magellanic Cloud and the ongoing RR Lyrae observations in the globular clusters at CFHT. Our Cepheid results provided a ten-fold increase in the precision of their Period-Luminosity relations, which resulted in a significant improvement in the calibration of the first-rung of the extragalactic distance ladder. I will also present the maximum light properties of Mira variables and their potential for the distance scale in the LSST era. |