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A global look into the world of interacting supernovae

Gangopadhyay, Anjasha; Misra, Kuntal; Kawabata, Koji; Dastidar, Raya; Singh, Mridweeka (Indian Academy of Sciences, 2022-12)

Interacting supernovae (SNe) IIn and Ibn show narrow emission lines and have always been a mysterious and unsolved genre in SNe physics. We present a comprehensive analysis of the temporal and spectroscopic behavior of ...

Global magnetospheric-ionospheric oscillations initiated by a solar wind pressure impulse

Huang, C. S; Foster, J. C; Reeves, G. D; Watermann, J; Sastri, J. H; Yumoto, K; Song, P (American Geophysical Union, 2003-06-10)

We present simultaneous observations of long-period (~1 hour) global magnetospheric-ionospheric oscillations with multiple spacecraft and ground-based instruments. These oscillations occurred following a major increase in ...

Global modes constituting the solar magnetic cycle. 3: `Shapes' and `sizes' of the sunspot cycles and maintenance of MHD spectrum by energy cascade

Gokhale, M. H; Javaraiah, J (Springer, 1995-01)

The `sunspot occurrence probability' defined in Paper 1 is used to determine the Legendre-Fourier (LF) terms in the `rate of emergence of toroidal magnetic flux, Q(theta, t), above the photosphere per unit latitude interval, ...

Global modes constituting the solar magnetic cycle. I - Search for 'dispersion relations'

Gokhale, M. H; Javaraiah, J; Kutty, K. N; Varghese, B. A (Springer Netherlands, 1992-03)

The spherical-harmonic-Fourier (SHF) analysis of the sun's magnetic field inferred from the Greenwich sunspot data is refined and extended to include the full length (1874-1976) of the data on the magnetic tape provided ...

Global modes constituting the solar magnetic cycle. II - Phases, 'geometrical eigenmodes', and coupling of field behaviour in different latitudes

Gokhale, M. H; Javaraiah, J (Springer Netherlands, 1992-04)

We show that the axisymmetric odd degree SHF modes of 21.4-yr periodicity and degrees l le 29 in the solar magnetic field (as inferred from sunspot data during 1874–1976), are at least approximately stationary. Among the ...

A Global Prospective of the Indian Optical and Near-Infrared Observational Facilities in the Field of Astronomy and Astrophysics: A Review

Sagar, R (Springer India, 2017-03)

A review of modernization and growth of ground based optical and near-infrared astrophysical observational facilities in the globe attributed to the recent technological developments in opto-mechanical, electronics and ...

Global sausage and kink modes in coronal loops

Anasooya Ashok; Satya Narayanan, A; Ramesh, R; Kathiravan, C (Anita Publications, 2004)

The Globular cluster M10: reassessment of stellar membership, distance, and age using its variable and HB stars

Arellano Ferro, A; Yepez, M. A; Muneer, S; Bustos Fierro, I. H; Schroder, K. P; Giridhar, S; Calderon, J. H (Oxford University Press on behalf of the Royal Astronomical Society, 2020-12)

Time-series VI CCD photometry of the globular cluster M10 (NGC 6254) is employed to perform a detailed identification, inspection of their light curves, their classification, and their cluster membership, of all the known ...

Globular cluster systems in giant elliptical galaxies : a probe for the galaxy formation and evolution

Subramaniam, A; Sagar, R (Astronomical Society of India, 2000)

Most of the globular clusters in the universe reside in gaint elliptical galaxies. The number of GCs present in them is about a few thousands. Due to their large distances (> 10 Mpc), it is impossible to observe their ...

Globular Cluster UVIT Legacy Survey (GlobULeS) – I. FUV–optical colour–magnitude diagrams for eight globular clusters

Sahu, Snehalata; Subramaniam, A; Singh, Gaurav; Yadav, Ramakant; Valcarce, Aldo R; Choudhury, Samyaday; Sharmila Rani; Deepthi, S. Prabhu; Chung, Chul; Cote, Patrick; Leigh, Nathan; Geller, Aaron M; Chatterjee, Sourav; Kameswara Rao, N; Bandyopadhyay, Avrajit; Shara, Michael; Dalessandro, Emanuele; Pandey, G; Postma, Joesph E; Hutchings, John; Simunovic, Mirko; Stetson, Peter B; Sivarani, T; Puzia, Thomas; Sohn, Young-Jong (Oxford University Press on behalf of the Royal Astronomical Society, 2022-07)

We present the first results of eight globular clusters (GCs) from the AstroSat/UVIT Legacy Survey programme GlobULeS based on the observations carried out in two far-ultraviolet (FUV) filters (F148W and F169M). The ...

Globular Cluster UVIT Legacy Survey (GlobULeS) – II. Evolutionary status of hot stars in M3 and M13

Kumar, Ranjan; Pradhan, Ananta C; Sahu, Snehalata; Subramaniam, A; Piridi, Sonika; Cassisi, Santi; Ojha, Devendra K (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)

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 GC UVIT Legacy Survey programme (GlobULeS). We use observations made ...

Globular Cluster UVIT Legacy Survey (GlobULeS). III. Omega Centauri in Far-ultraviolet

Deepthi, S. Prabhu; Subramaniam, A; Sahu, Snehalata; Chung, Chul; Leigh, Nathan W. C; Dalessandro, Emanuele; Chatterjee, Sourav; Kameswara Rao, N; Shara, Michael; Cote, Patrick; Choudhury, Samyaday; Pandey, G; Valcarce, Aldo A. R; Singh, G; Postma, Joesph E; Sharmila Rani; Bandyopadhyay, Avrajit; Geller, Aaron M; Hutchings, John; Puzia, Thomas; Simunovic, Mirko; Sohn, Young-Jong; Sivarani, T; Yadav, Ramakant Singh (American Astronomical Society, 2022-11-10)

We present the first comprehensive study of the most massive globular cluster, Omega Centauri, in the farultraviolet (FUV), extending from the center to ∼28% of the tidal radius using the Ultraviolet Imaging Telescope on ...

Globular Clusters A Photometric Study of Some Southern Clusters

Scaria, K. K (Indian Institute of Astrophysics, Bangalore, 1980-01)

GlobULeS – V. UVIT/AstroSat studies of stellar populations in NGC 362: detection of blue lurkers in a globular cluster

Dattatrey, Arvind K; Yadav, R. K. S; Kumawat, Gourav; Sharmila Rani; Singh, Gaurav; Subramaniam, A; Singh, Ravi S (Oxford University Press on behalf of Royal Astronomical Society, 2023-07)

We report the discovery of four blue lurkers with low- and extremely low mass white dwarf (ELM WD) companions in the Galactic globular cluster NGC 362 using AstroSat’s Ultra Violet Imaging Telescope (UVIT). We analysed ...

GlobULeS. IV. UVIT/AstroSat Detection of Extremely Low Mass White Dwarf Companions to Blue Straggler Stars in NGC 362

Dattatrey, Arvind K; Yadav, R. K. S; Sharmila Rani; Subramaniam, A; Singh, Gaurav; Sahu, Snehalata; Singh, Ravi S (American Astronomical Society, 2023-02-01)

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 AstroSatʼs Ultra Violet Imaging Telescope (UVIT). ...

Glowing tributes paid to Bappu

Newspaper Clippings (Newspaper Clippings, 1982-08-25)

GMRT detection of H I absorption in the high-redshift red quasar 3C 190

Ishwara-Chandra, C. H; Anantharamaiah, K. R; Dwarakanath, K. S (Astronomical Society of India, 2002-09)

We report the GMRT detection of H I absorption in the high_ redshlft red quasar 30 190 at a redshift of 1.1946. The most interesting result is that the peak of the H I absorption is blueshifted by I'W 250 kms-1 with respect ...

A GMRT H I imaging survey of the ERIDANUS group of galaxies

Omar, A; Dwarakanath, K. S; Anantharamaiah, K. R (Astronomical Society of India, 2002-09)

This project aims to image a subset of galaxies in the nearby Eridanus group in H I emission and in radio continuum using the GMRl'. The typical resolution of H I images will be ",1 kpc with a 30" sensitivity to H I ...

GMRT H I study of giant low surface brightness galaxies

Mishra, A; Kantharia, N. G; Das, Mousumi; Omar, A; Srivastava, D. C (Oxford University Press on behalf of the Royal Astronomical Society, 2017-01)

We present H I observations of four giant low surface brightness (GLSB) galaxies UGC 1378, UGC 1922, UGC 4422 and UM 163 using the Giant Meterwave Radio Telescope. We include H I results on UGC 2936, UGC 6614 and Malin 2 ...

GMRT Neutral Hydrogen Observations of the Sombrero Galaxy

Sengupta, C; Balasubramanyam, R; Bekki, K (Astronomical Society of India, 2003)

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