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  • Characterizing the companion AGBs using surface chemical composition of barium stars 
    Shejeelammal, J; Goswami, A; Goswami, P. P; Rathour, R. S; Masseron, T (Oxford University Press on behalf of the Royal Astronomical Society, 2020-10)
    Barium stars are one of the important probes to understand the o rigin and evolution of slow neutron-capture process elements in the Galaxy. These are e xtrinsic stars, where the observed s-process element abundances ...
  • Characterizing the Optical Nature of the Blazar S5 1803+784 during Its 2020 Flare 
    Agarwal, A; Pandey, Ashwani; Ozdonmez, Aykut; Ege, Ergun; Avik, Kumar Das; Volkan, Karakulak (IOP Publishing, 2022-07-01)
    We report the results from our study of the blazar S5 1803+784 carried out using quasi-simultaneous B, V, R, and I observations from 2020 May to 2021 July on 122 nights. Our observing campaign detected a historically bright ...
  • Characterizing the Ordinary Broad-line Type Ic SN 2023pel from the Energetic GRB 230812B 
    Srinivasaragavan, Gokul P; Swain, Vishwajeet; O’Connor, Brendan; Anand, Shreya; Ahumada, Tomás; Perley, Daniel; Stein, Robert; Sollerman, Jesper; Fremling, Christoffer; Cenko, S. Bradley; Antier, S; Guessoum, Nidhal; Hussenot-Desenonges, Thomas; Hello, Patrice; Lesage, Stephen; Hammerstein, Erica; Miller, M. Coleman; Andreoni, Igor; Bhalerao, Varun; Bloom, Joshua S; Dutta, Anirban; Gal-Yam, Avishay; Hinds, K-Ryan; Jaodand, Amruta; Kasliwal, Mansi; Kumar, Harsh; Kutyrev, Alexander S; Ragosta, Fabio; Ravi, Vikram; Sharma, Kritti; Teja, Rishabh Singh; Yang, Sheng; Anupama, G. C; Bellm, Eric C; Coughlin, Michael W; Mahabal, Ashish A; Masci, Frank J; Pathak, Utkarsh; Purdum, Josiah; Roberts, Oliver J; Smith, Roger; Wold, Avery (American Astronomical Society, 2024-01-10)
    We report observations of the optical counterpart of the long gamma-ray burst (GRB) GRB 230812B and its associated supernova (SN) SN 2023pel. The proximity (z = 0.36) and high energy (Eγ,iso ∼ 1053 erg) make it an important ...
  • Charged particle trajectories in a toroidal magnetic and rotation-induced electric field around a black hole 
    Sengupta, S (World Scientific Publishing Company, 1997-10)
    Trajectories of charged particles in a combined poloidal, toroidal magnetic field and a rotation-induced unipolar electric field superposed on a Schwarzschild background geometry have been investigated extensively in the ...
  • Charged particle trajectories in the field of a charge near a Schwarzschild blackhole 
    Sonar, V. P; Dhurandhar, S. V; Dadhich, N (Astronomical Society of India, 1985-12)
    We consider motion of charged particles in the field of a charge placed near the Schwarzschild balckhole. The electromagnetic field gets modified owing to gravitational field of the blackhole. The system, charge plus the ...
  • Charged particle trajectories in the presence of a toroidal magnetic field on a Schwarzschild background 
    Prasanna, A. R; Sengupta, S (Elsevier, 1994-09)
    Trajectories of a single charged particle in the presence of toroidal magnetic fields superposed on the Schwarzschild background geometry have been obtained, and it is shown that the toroidal field repels the particles and ...
  • Charles Michie Smith (1854 - 1922) 
    Indian Institute of Astrophysics (Indian Institute of Astrophysics, 2006)
  • Charles Michie Smith – founder of the Kodaikanal (Solar Physics) Observatory and beginnings of physical astronomy in India 
    Kameswara Rao, N; Vagiswari, A; Birdie, C (Indian Academy of Sciences, 2014-02-10)
    It has been about 115 years since the establishment of Kodaikanal Observatory as an extension of the original Madras Observatory, which has evolved into the present Indian Institute of Astrophysics at Bangalore. It is ...
  • Chasing the Total Solar Eclipse 2019 
    Kapoor, R. C (NISCAIR-CSIR, India, 2019-09)
    A solar eclipse with a totality of a rather long duration took place on 2 July 2019. The path of totality started east of New Zealand in the southern Pacific Ocean and passed over parts of Chile and Argentina. The maximum ...
  • A cheap telescope 
    Tomkins, H. G (Astronomical Society of India, 1912-12)
  • Chemical abundances of metal-poor stars as probes of neutron capture nucleosynthesis 
    Goswami, Partha Pratim (Indian Institute of Astrophysics, 2022-06)
    After more than six decades of the pioneering work of Burbidge, Burbidge, Fowler and Hoyle (1957), which first suggested the production channels and the evolution of neutron-capture elements, many details still remain ...
  • Chemical analysis of a carbon-enhanced very metal-poor star: CD-27 14351 
    Drisya, K; Goswami, A; Masseron, T (IOP Publishing, 2017-01-01)
    We present, for the first time, an abundance analysis of a very metal-poor carbon-enhanced star CD-27 14351 based on a high-resolution (R ~ 48,000) FEROS spectrum. Our abundance analysis performed using local thermodynamic ...
  • Chemical analysis of CH stars – I. Atmospheric parameters and elemental abundances 
    Drisya, K; Goswami, A (Oxford University Press on behalf of the Royal Astronomical Society, 2014-05-11)
    Results from high-resolution spectral analyses of a selected sample of CH stars are presented. Detailed chemical composition studies of these objects, which could reveal abundance patterns that in turn provide information ...
  • Chemical analysis of CH stars – II. Atmospheric parameters and elemental abundances 
    Drisya, K; Goswami, A (Oxford University Press on behalf of the Royal Astronomical Society, 2015-01-21)
    We present detailed chemical analyses for a sample of 12 stars selected from the CH star catalogue of Bartkevicius. The sample includes two confirmed binaries, four objects that are known to show radial velocity variations ...
  • Chemical analysis of CH stars – III. Atmospheric parameters and elemental abundances 
    Meenakshi, P; Goswami, A; Goswami, P. P; Shejeelammal, J; Masseron, T (Oxford University Press on behalf of the Royal Astronomical Society, 2019-07)
    Elemental abundances of CH stars can provide observational constraints for theoretical studies on the nucleosynthesis and evolution of low- and intermediate-mass stars. However, available abundance data in literature are ...
  • Chemical analysis of three barium stars: HD 51959, HD 88035, HD 121447 
    Drisya, K; Goswami, A; Sridhar, N; Masseron, T; Meenakshi, P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-05)
    We present elemental abundance results from high-resolution spectral analysis of three nitrogen-enhanced barium stars. The analysis is based on spectra obtained with the fibre- fed extended range optical spectrograph ...
  • Chemical Analysis of Two Extremely Metal-poor Stars HE 2148-2039 and HE 2155-2043 
    Meenakshi, P; Goswami, A (IOP Publishing, 2021-05-01)
    We present elemental abundance results for HE 2148−2039 and HE 2155−2043 based on a detailed high-resolution spectroscopic analysis. The high-resolution Subaru/High Dispersion Spectrograph (HDS) spectra used for our analysis ...
  • The chemical composition and circumstellar environment of the variable star QY sge 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 2004)
    Chemical composition studies of the variable star QY Sge show abundance anomalies suggestive of the pattern exhibited by the warmer RV Tau variables. Abundance analysis indicates a near-solar atmosphere with highly condensable ...
  • Chemical composition and evolutionary status of nine UV-bright stars in five globular clusters from VLT/UVES spectra 
    Jasniewicz, G; de Laverny, P; Parthasarathy, M; Lèbre, A; Thévenin, F (EDP Sciences, 2004-08)
    We have derived the chemical composition of nine UV-bright stars belonging to five Galactic globular clusters of various metallicities ([Fe/H] from -1.0 to -2.4 dex). The analyses are based on high resolution spectra ...
  • Chemical composition of a sample of candidate post-asymptotic giant branch stars 
    Sumangala Rao, S; Giridhar, S; Lambert, D. L (Wiley-Blackwell, 2012-01)
    We have derived elemental abundances for a sample of nine IRAS sources with colours similar to those of post-asymptotic giant branch (post-AGB) stars. For IRAS 01259+6823, IRAS 05208−2035, IRAS 04535+3747 and IRAS 08187−1905, ...

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