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UV photometry of spotted stars in the horizontal branch of the globular cluster NGC 2808 using AstroSat

Deepthi, S. Prabhu; Subramaniam, A; Snehalata Sahu (Indian Academy of Science, 2021-10)

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 variability is driven by the projected ...
The UV spectrum of the WC 11 star CPD -56 deg 8032

Kameswara Rao, N; Giridhar, S; Nandy, K (The European Southern Observatory, 1990-08)

UV observations of the WC 11 central star of the compact planetary nebula CPD -56 deg 8032 show that the continuum flux is variable. This variability appears to be caused by a change in the circumstellar extinction properties. ...
UV stellar populations in globular clusters: horizontal branch morphology and blue straggler stars

Snehalata Sahu (Indian Institute of Astrophysics, 2019-09)

Globular Clusters (GCs) are the systems that contains million of stars bound together by gravity forming a spherical distribution. As the timescales of dynamical encounters occurring in these dense systems are shorter ...
UV(IUE) spectra of hot post-AGB candidates

Gauba, G; Parthasarathy, M (The European Southern Observatory, 2003-09)

Analysis of the low resolution UV(IUE) spectra (1150 to 3200 Å) of 15 hot post-AGB candidates is presented. The UV(IUE) spectra of 10 stars suggest partial obscuration of the hot stars due to circumstellar dust. The reddened ...
UVIT imaging of WLM: demographics of star-forming regions in the nearby dwarf irregular galaxy

Mondal, Chayan; Subramaniam, A; George, K (IOP Publishing, 2018-09)

We present a study of star-forming regions and their demographics in the nearby dwarf irregular galaxy WLM using Ultraviolet Imaging Telescope (UVIT) multiband observations in three filters, F148W, N245M, and N263M. We ...
A UVIT Look at Star Formation in Nearby Interacting/Merging Galaxies

Mousumi Das (Cambridge University Press on behalf of International Astronomical Union, 2023)

The interactions and mergers of gas rich galaxies are known to produce star formation which often leads to nuclear activity as well. The star formation is ideally mapped using FUV and NUV emission, since UV traces star ...
UVIT observation of Milky Way satellite galaxy Reticulum II

Divakar, D. K; Sivarani, T; Doddamani, V. H (Indian Academy of Sciences, 2021-10)

We present the UV photometry of one of the Ultra-Faint Dwarf (UFD) Milky Way (MW) satellite galaxies, Reticulum II, using images acquired with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat. Reticulum II is ...
UVIT Observations of the Small Magellanic Cloud: Point-source Catalog

Devaraj, A; Joseph, P; Stalin, C. S; Tandon, S. N; Ghosh, S. K (American Astronomical Society, 2023-04-01)

Three fields in the outskirts of the Small Magellanic Cloud were observed by the UltraViolet Imaging Telescope (UVIT) on board AstroSat, between 2017 December 31 and 2018 January 1. The observations were carried out on a ...
UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation

George, K; Joseph, P; Mondal, Chayan; Devaraj, A; Subramaniam, A; Stalin, C. S; Cote, P; Ghosh, S. K; Hutchings, J. B; Mohan, Rekhesh; Postma, J; Sankarasubramanian, K; Sreekumar, P; Tandon, S. N (EDP Sciences, 2018-05)

Context. Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into a red-sequence galaxy, though the details are still unclear. Aims. Here we explore the ...
UVIT observations of UV-Bright stars in four Galactic Globular Clusters

Kumar, R; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, A; Murthy, J (Cambridge University Press, 2019-05)

We have performed photometric analysis of four Galactic globular clusters (GGCs): NGC 4147, NGC 4590, NGC 5053 and NGC 7492 using far-UV and near-UV filters of the Ultraviolet Imaging Telescope (UVIT) on-board AstroSat. ...
UVIT open cluster study. I. detection of a white dwarf companion to a blue straggler in M67: evidence of formation through mass transfer

Sindhu, N; Subramaniam, A; Jadhav, V. V; Chatterjee, Sourav; Geller, Aaron M; Knigge, Christian; Leigh, Nathan; Puzia, Thomas H; Shara, Michael; Simunovic, Mirko (IOP Publishing, 2019-09-01)

The old open cluster M67, populated with blue straggler stars (BSSs), is a well-known test bed to study the BSS formation pathways. Here, we report the first direct detection of a white dwarf (WD) companion to a BSS in ...
UVIT Open Cluster Study. II. Detection of Extremely Low Mass White Dwarfs and Post – Mass Transfer Binaries in M67

Jadhav, Vikrant V; Sindhu, N; Subramaniam, A (IOP Publishing, 2019-11)

A detailed study of the UV-bright stars in the old open star cluster M67 is presented based on the far-UV observations using the Ultra Violet Imaging Telescope ( UVIT ) on ASTROSAT . The UV and UV – optical ...
UVIT Study of the MAgellanic Clouds (U-SMAC) – I. Recent star formation history and kinematics of the Shell region in the north-eastern Small Magellanic Cloud

Hota, Sipra; Subramaniam, A; Dhanush, S. R; Cioni, Maria-Rosa L; Subramanian, S (Oxford University Press on behalf of Royal Astronomical Society, 2024-07)

The interactions between the Magellanic Clouds significantly affect the shape and distribution of the young stellar population, particularly in the periphery of the Small Magellanic Cloud (SMC). We present the first far-UV ...
UVIT study of UV bright stars in the globular cluster NGC 4147

Ranjan Kumar; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, Abhisek; Murthy, J; Cassisi, Santi (Indian Academy of Sciences, 2021-10)

We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF2 (F154W), sapphire (F169M), and silica (F172M) of Ultra-Violet Imaging Telescope (UVIT) on-board the AstroSat satellite. ...
UVIT view of Centaurus A: a detailed study on positive AGN feedback

Joseph, P; Sreekumar, P; Stalin, C. S; Paul, K. T; Mondal, Chayan; George, Koshy; Mathew, Blesson (Oxford University Press on behalf of Royal Astronomical Society, 2022-10)

Supermassive black holes at the centre of active galactic nuclei (AGNs) produce relativistic jets that can affect the star formation characteristics of the AGN hosts. Observations in the ultraviolet (UV) band can provide ...
UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at ∼ 0.35 kpc resolution

Rakhi, R; Santhosh, Geethika; Joseph, Prajwel; George, Koshy; Subramanian, S; Kavila, Indulekha; Postma, J; Duc, Pierre-Alain; Cote, Patrick; Cortese, Luca; Ghosh, S. K; Subramaniam, A; Tandon, Shyam; Hutchings, John; Wesley, P. Samuel; Bharadwaj, Aditya; Niroula, Neeran (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)

NGC 5291, an early-type galaxy surrounded by a giant H I ring, is believed to be formed from collision with another galaxy. Several star forming complexes and tidal dwarf galaxies are distributed along the collisional ...
UVIT view of ram-pressure stripping in action: Star formation in the stripped gas of the GASP jellyfish galaxy JO201 in Abell 85

George, K; Poggianti, B. M; Gullieuszik, M; Fasano, G; Bellhouse, C; Postma, J; Moretti, A; Jaffe, Y; Vulcani, B; Bettoni, D; Fritz, J; Cote, P; Ghosh, S. K; Hutchings, J. B; Mohan, Rekhesh; Sreekumar, P; Stalin, C. S; Subramaniam, A; Tandon, S. N (Oxford University Press on behalf of the Royal Astronomical Society, 2018-09)

Jellyfish are cluster galaxies that experience strong ram-pressure effects that strip their gas. Their Hα images reveal ionized gas tails up to 100 kpc, which could be hosting ongoing star formation. Here, we report the ...
UVIT-HST-Gaia-VISTA study of Kron 3 in the small magellanic cloud: a cluster with an extended red clump in ultraviolet

Nayak, P. K; Subramaniam, A; Subramanian, S; Sahu, S; Mondal, C; Cioni, Maria-Rosa L; Bell, Cameron P. M; Bandyopadhyay, A; Chung, Chul (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)

We have demonstrated the advantage of combining multiwavelength observations, from the ultraviolet (UV) to near-infrared, to study Kron 3, a massive star cluster in the Small Magellanic Cloud. We have estimated the radius ...
UVIT/AstroSat studies of blue straggler stars and post-mass transfer systems in star clusters: detection of one more blue lurker in M67

Subramaniam, A; Pnadey, Sindhu; Jadhav, Vikrant V; Snehalata Sahu (Indian Academy of Sciences, 2020-12)

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 dwarf (WD) companions to two BSSs and one ...
UVIT–HST–GAIA view of NGC 288: a census of the hot stellar population and its properties from UV

Snehalata Sahu; Subramaniam, A; Cote, Patrick; Kameswara Rao, N; Stetson, Peter B (Oxford University Press on behalf of the Royal Astronomical Society, 2019-01)

A complete census of the blue horizontal branch (BHB) and blue straggler star (BSS) population within a 10 radius from the centre of the globular cluster NGC 288 is presented, based on images from the Ultraviolet Imaging ...

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