13 papers
Large Magellanic Cloud Globular Clusters in the Near-infrared. I. RR Lyrae in Reticulum
Anupam Bhardwaj, Susmita Das, Prashant Nishad +10
Reticulum is an old, metal-poor, and sparsely populated globular cluster in the outer regions of the Large Magellanic Cloud (LMC) and hosts a rich population of RR Lyrae stars. Bei…
A Pilot Study to Verify the RR Lyrae Candidates with Vera C. Rubin Observatory Early Alerts
Chow-Choong Ngeow, Anupam Bhardwaj, Sarang Shah +2
We present a pilot study using the Vera C. Rubin Observatory early alerts to verify RR Lyrae candidates in the Pan-STARRS1, the Dark Energy Survey, and the Next-Generation Virgo Cl…
Exploring RR Lyrae Variable Stars in the Vera C. Rubin Observatory Data Preview 1
Chow-Choong Ngeow, Anupam Bhardwaj
We investigate the properties of known RR Lyrae in the Vera C. Rubin Observatory Data Preview 1 (DP1) fields and compare those with the predictions based on stellar pulsation model…
SRGA J115215.0510656: an unusual long-period eclipsing dwarf nova with disc wind signatures
Nikita Rawat, David A. H. Buckley, John R. Thorstensen +9
We present the first detailed optical study of the cataclysmic variable SRGA J115215.0510656, based on new time-resolved photometric and spectroscopic observations complemented…
Stellar Variability and Distance Indicators in the Near-infrared in Nearby Galaxies. II. Pulsating Stars in the Carina Dwarf Spheroidal
Chow-Choong Ngeow, Anupam Bhardwaj, Prashant Nishad +1
We present homogeneous, near-infrared ( bands) time-series observations of the classical Carina dwarf Spheroidal (dSph) galaxy to determine accurate and precise distances us…
Type II Cepheids: Period-Luminosity-Metallicity relations for the Population II distance scale
Susmita Das, Anupam Bhardwaj, Marcella Marconi
Type II Cepheids are a class of pulsating variable stars that play a critical role in our understanding of stellar evolution, distance measurement and tracing the structure and kin…