77 citations · 265 across the 21 of their papers we have counts for
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Unveiling the white dwarf in J191213.72-441045.1 through ultraviolet observations
Ingrid Pelisoli, Snehalata Sahu, Maxim Lyutikov +7
J191213.72-441045.1 is a binary system composed of a white dwarf and an M-dwarf in a 4.03-hour orbit. It shows emission in radio, optical, and X-ray, all modulated at the white dwa…
An HST COS ultra-violet spectroscopic survey of 311 DA white dwarfs.I. Fundamental parameters and comparative studies
Snehalata Sahu, Boris T. Gaensicke, Pier-Emmanuel Tremblay +8
White dwarf studies carry significant implications across multiple fields of astrophysics, including exoplanets, supernova explosions, and cosmological investigations. Thus, accura…
Study of blue metal-poor stars using UVIT/AstroSat
Anju Panthi, Annapurni Subramaniam, Kaushar Vaidya +5
Blue metal-poor stars are main-sequence stars that are bluer and brighter than typical turn-off stars in metal-poor globular clusters. They are thought to have either evolved throu…
Globular Cluster UVIT Legacy Survey (GlobULeS) II. Evolutionary status of hot stars in M3 and M13
Ranjan Kumar, Ananta C. Pradhan, Snehalata Sahu +4
We present a far-ultraviolet (FUV) study of hot stellar populations in the second parameter pair globular clusters (GCs) M3 and M13, as a part of the Globular cluster UVIT Legacy S…
GlobULeS-IV. UVIT/AstroSat detection of extremely low mass white dwarf companions to blue straggler stars in NGC 362
Arvind K. Dattatrey, R. K. S. Yadav, Sharmila Rani +4
We report the discovery of extremely low-mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroS…
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…
AstroSat study of the globular cluster NGC 2298: probable evolutionary scenarios of hot HB stars
Sharmila Rani, Gajendra Pandey, Annapurni Subramaniam +3
We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical…
UV photometry of spotted stars in the horizontal branch of the globular cluster NGC 2808 using AstroSat
Deepthi S. Prabhu, Annapurni Subramaniam, Snehalata Sahu
A recent study of hot (20,000 to 30,000 K) extreme horizontal branch (EHB) stars in globular clusters (GCs) has led to the discovery of their variability. It is suggested that this…
The First Extensive Exploration of UV-bright Stars in the Globular Cluster NGC 2808
Deepthi S. Prabhu, Annapurni Subramaniam, Snehalata Sahu
In this study, we identified and characterized the hot and luminous UV-bright stars in the globular cluster NGC 2808. We combined data from the Ultra Violet Imaging Telescope (UVIT…
Study of UV bright stellar populations in the globular cluster NGC 1261 using AstroSat
Sharmila Rani, Gajendra Pandey, Annapurni Subramaniam +2
We present the UV photometry of the globular cluster NGC 1261 using images acquired with the Ultraviolet Imaging Telescope (UVIT) on-board ASTROSAT. We performed PSF photometry on…
UOCS. V. UV study of the old open cluster NGC 188 using AstroSat
Sharmila Rani, Annapurni Subramaniam, Sindhu Pandey +3
We present the UV photometry of the old open cluster NGC188 obtained using images acquired with Ultraviolet Imaging Telescope (UVIT) on board the ASTROSAT satellite, in two far-UV…
Peculiarities in the horizontal branch stars of globular cluster NGC 1851: Discovery of a Blue straggler companion to an EHB star
Gaurav Singh, Snehalata Sahu, Annapurni Subramaniam +1
We present a study of Far Ultraviolet (FUV) bright horizontal branch (HB) stars to understand the peculiarities seen in the HB sequence of the Globular Cluster NGC 1851, using grou…
UVIT/ASTROSAT studies of Blue Straggler stars and post-mass transfer systems in star clusters: Detection of one more blue lurker in M67
Annapurni Subramaniam, Sindhu Pandey, Vikrant V. Jadhav +1
The blue straggler stars (BSSs) are main-sequence (MS) stars, which have evaded stellar evolution by acquiring mass while on the MS. The detection of extremely low mass (ELM) white…
Radial Distribution of Blue Stragglers in NGC 5466 using AstroSat
Snehalata Sahu, Annapurni Subramaniam
We present the results obtained from Near-UV observations of the cluster NGC 5466 taken with UVIT onboard AstroSat to study the radial distribution of Blue Straggler Stars (BSSs),…
Detection of a White Dwarf companion to a Blue Straggler Star in the outskirts of globular cluster NGC 5466 with the Ultraviolet Imaging Telescope (UVIT)
Snehalata Sahu, Annapurni Subramaniam, Mirko Simunovic +8
We report the discovery of a hot white dwarf (WD) companion to a blue straggler star (BSS) in the globular cluster (GC) NGC 5466, based on observations from the Ultra-Violet Imagin…
UVIT-HST-GAIA view of NGC 288: A census of hot stellar population and their properties from UV
Snehalata Sahu, Annapurni Subramaniam, Patrick Côté +2
A complete census of Blue Horizontal Branch (BHB) and Blue Straggler Star (BSS) population within the 10 radius from the center of the Globular Cluster, NGC 288 is presented, ba…
The Horizontal Branch population of NGC 1851 as revealed by the Ultra-violet Imaging Telescope (UVIT)
Annapurni Subramaniam, Snehalata Sahu, Joseph E. Postma +15
We present the UV photometry of the globular cluster NGC 1851 using images acquired with the Ultra-violet Imaging Telescope (UVIT) onboard the ASTROSAT satellite. PSF-fitting photo…