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Field blue straggler stars: Discovery of white dwarf companions to blue metal-poor stars using UVIT/AstroSat
Anju Panthi, Annapurni Subramaniam, Kaushar Vaidya +4
Blue metal-poor (BMP) stars are the main-sequence stars that appear bluer and more luminous than normal turn-off stars of metal-poor globular clusters. They are believed to be eith…
Globular Cluster UVIT legacy Survey (GlobUleS) III. Omega Centauri in Far-Ultraviolet
Deepthi S. Prabhu, Annapurni Subramaniam, Snehalata Sahu +21
We present the first comprehensive study of the most massive globular cluster Omega Centauri in the far-ultraviolet (FUV) extending from the center to ~ 28% of the tidal radius usi…
A high-resolution spectroscopic study of two new Na- and Al-rich field giants -- likely globular cluster escapees in the Galactic halo
Avrajit Bandyopadhyay, Sivarani Thirupathi, Timothy C. Beers +1
The stars SDSS J064655.6+411620.5 and SDSS J193712.01+502455.5 are relatively bright stars that were initially observed as part of the SDSS/MARVELS pre-survey. They were selected,…
Chemical composition of two bright extremely metal-poor stars from the SDSS MARVELS pre-survey
Avrajit Bandyopadhyay, Sivarani Thirupathi, Antony Susmitha +4
\sdsszeroeight\ (V = 11.4; [Fe/H] = 3.1) and \sdssonethree\ (V = 12.4; [Fe/H] = 3.2) were observed with the SDSS 2.5-m telescope as part of the SDSS-MARVELS spectroscopic pre…
Automated Determination of [Fe/H] and [C/Fe] from Low-Resolution Spectroscopy
B. Marsteller, T. C. Beers, T. Sivarani +5
We develop an automated spectral synthesis technique for the estimation of metallicities ([Fe/H]) and carbon abundances ([C/Fe]) for metal-poor stars, including carbon-enhanced met…