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Browsing IIAP Publications by Title

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  • VI CCD photometry of metal-rich globular clusters: NGC 6528 
    Richtler, T; Grebel, E. K; Subramaniam, A; Sagar, R (European Southern Observatory, 1998-01)
    We present CCD photometry in V and I for the metal-rich globular cluster NGC 6528. A comparison with previous photometry reveals discrepancies of the order 0.1 to 0.2 mag in V, emphasizing the need for independent photometry. ...
  • Vibration-rotation spectrum of CIO and its role in the stratosphere 
    Murty, P. S (American Meteorological Society, 1979-10)
    The possible role in the stratosphere of vibrationally excited chlorine monoxide molecules in the ground electronic state is examined. An infrared vibration-rotation emission spectrum of chlorine monoxide is expected to ...
  • Video recording of the flash spectrum during the total solar eclipse October 24, 1995 
    Trivedi, P; Guruprasad, R; Radhakrishnan, R. S (Indian Institute of Astrophysics, Bangalore, 1997)
    Flash spectra were recorded at video rate from Behind, Madhya Pradesh A holographic transmission grating, was used in front of a CCD video camera. Using a. solar Image of 0 5mm diameter, the spectrum on the CCD was recorded ...
  • The violent hard X-ray variability of MRK 421 observed by Nustar in 2013 April 
    Paliya, Vaidehi S; Bottcher, M; Diltz, C; Stalin, C. S; Sahayanathan, S; Ravikumar, C. D (IOP Publishing, 2015-10-01)
    The well-studied blazar Markarian 421 (Mrk 421, z = 0.031) was the subject of an intensive multi-wavelength campaign when it flared in 2013 April. The recorded X-ray and very high-energy (E > 100 GeV) γ-ray fluxes are the ...
  • Violet absorption edges of C IV lines in Wolf-Rayet spectra: possible superposition with diffuse interstellar bands at 5780 Å and 5797 Å 
    Giridhar, S; Bappu, M. K. V (Indian Institute of Astrophysics, 1978)
    It is shown that the violet edges normally seen in Wolf-Rayet stars around 5800Å are principally due to displaced C IV absorption. The diffuse interstellar bands are seldom of comparable strength and can be seen separately ...
  • Viscous damping of Alfven surface waves in the solar atmosphere 
    Rathinavelu, G. D; Sivaraman, M; Narayanan, A. S (MAIK Nauka, 2009-12)
    The dispersion relation for the propagation of viscous Alfven surface waves along viscous plasma plasma interface has been derived. Two modes of Alfven surface waves are found to propagate with their characteristics depend ...
  • Viscous damping of Alfven surface waves with steady flows 
    Rathinavelu, G. D; Sivaraman, M; Satya Narayanan, A (Springer, 2010)
    The dispersion relation of Alfvén Surface Waves propagating along the moving viscous plasma–vacuum interface has been derived and solved numerically. The plasma layer is below while the upper layer is assumed to be vacuum. ...
  • Viscous damping of Alfvén surface waves at a magnetic interface 
    Rathinavelu, G. D; Sivaraman, M; Satya Narayanan, A (IOP Publishing, 2010-02)
    The dispersion relation for the propagation of viscous Alfvén surface waves along viscous plasma-plasma interface has been derived. Two modes of Alfvén surface waves are found to propagate with their characteristics depend ...
  • Visible emission line coronagraph on Aditya-L1 
    Prasad, B. R; Banerjee, D; Singh, J; Nagabhushana, S; Amit Kumar; Kamath, P. U; Kathiravan, S; Venkata Suresh, Narra; Rajkumar, N; Natarajan, V; Juneja, Madhur; Somu, Pawan; Pant, V; Shaji, Nigar; Sankarsubramanian, K; Patra, Asit; Venkateswaran, R; Adoni, A. A; Narendra, S; Haridas, T. R; Mathew, S. K; Mohan Krishna, R; Amareswar, K; Jaiswa, Bhavesh (Indian Academy of Science, 2017-08-25)
    Solar coronagraph mimics total solar eclipse by blocking the solar disk and enabling the observation of extended coronal atmosphere of the Sun. Visible Emission Line Coronagraph (VELC), on-board Aditya-L1 space mission, ...
  • The visible emission spectrum of diatomic barium iodide 
    Rao, M. L. P; Rao, D. V. K; Rao, P. T; Murty, P. S (1977)
    High resolution spectrograms of the visible emission spectrum of diatomic barium iodide, excited in a radio-frequency discharge source, reveal the presence of two intense sequences of head-less bands in the region 5330-5620Å. ...
  • Visible spectrum of Pi/sup1 Gruis - Identification of new E/sup1 Pi-X/sup1 Sigma/sup+/ and 1 Sigma/sup+ - X/sup1 Sigma/sup+ bands of ZrO 
    Murty, P. S (American Astronomical Society, 1982-09)
    New molecular features identified with the e 1H-X + and ` +-X ` + transitions of ZrO, in the 5840-7210 A spectral region of the S star ` Gru, are presented. The measured band positions are in accord with the laboratory and ...
  • VLA observations of extreme hydrogen deficient stars 
    Kameswara Rao, N; Venugopal, V. R; Patnaik, A (Indian Academy of Sciences, 1985-09)
    Observations at 2 and 6 cm have been obtained for six hydrogen-deficient stars R CrB, HD 160641, BD -9 deg 4395, V 348 Sgr, MV Sgr, and Upsilon Sgr by means of the National Radio Astronomy Observatory's Very Large Array ...
  • VLA observations of solar active regions at 6 and 20 CM 
    Alissandrakis, C. E; Kundu, M. R; Shevgaonkar, R. K (The European Southern Observatory, 1991-11)
    High-resolution observations are presented of two active regions at 6 and 20 cm over a period of 5 days, together with H-alpha and photospheric magnetic fields. The large-scale emission at 20 cm is associated with the ...
  • Vlasov-Maxwell equilibria of solar coronal loops 
    Krishan, V; Sreedharan, T. D; Mahajan, Swadesh M (Royal Astronomical Society, 1991-04)
    A Vlasov-Maxwell description of the ubiquitous solar coronal structures is presented. It is found that an equilibrium plasma configuration can live with spatial gradients in density, temperature, current and drift speeds ...
  • A VLA–GMRT look at 11 powerful FR II quasars 
    Vaddi, Sravani; Kharb, P; Daly, R. A; O’Dea, C P; Baum, S. A; Deo, D.K; Barbusca, T.C; Murali, Chintak (Oxford University Press on behalf of the Royal Astronomical Society, 2019-03)
    We present results from 1.4 and 5 GHz observations at matched resolution with the Karl G. Jansky Very Large Array (VLA) of 11 powerful 3C FR II quasars. We examine the 11 quasars along with a sample of 13 narrow-line FR II ...
  • A VLBA-uGMRT search for candidate binary black holes: study of six X-shaped radio galaxies with double-peaked emission lines 
    Sebastian, Biny; Caproni, Anderson; Kharb, Preeti; Nayana, A. J; Ali, Arshi; Rubinur, K; O Dea, Christopher P; Baum, Stefi; Nandi, Sumana (Oxford University Press on behalf of Royal Astronomical Society, 2024-06)
    Identifying methods to discover dual active galactic nucleus (AGN) has proven to be challenging. Several indirect tracers have been explored in the literature, including X/S-shaped radio morphologies and double-peaked (DP) ...
  • VLBI imaging of the double peaked emission line seyfert KISSR 1494 
    Kharb, P; Mousumi Das; Paragi, Z; Subramanian, S; Pradeep Chitta, L (IOP Publishing, 2015-02-01)
    We present here the results from dual-frequency phase-referenced Very Long Baseline Interferometry observations of the Seyfert galaxy KISSR 1494, which exhibits double peaked emission lines in its Sloan Digital Sky Survey ...
  • VLTI-AMBER velocity-resolved aperture-synthesis imaging of η· Carinae with a spectral resolution of 12 000 
    Weigelt, G; Hofmann, K. H; Schertl, D; Clementel, N; Corcoran, M. F; Damineli, A; De Wit, W. J; Grellmann, R; Groh, J; Guieu, S; Gull, T; Heininger, M; Hillier, D. J; Hummel, C. A; Kraus, S; Madura, T; Mehner, A; Merand, A; Millour, F; Moffat, A. F. J; Ohnaka, K; Patru, F; Petrov, R. G; Sridharan, R; Richardson, N. D; Rivinius, T; Scholler, M; Teodoro, M; Wittkowski, M (EDP Sciences, 2016-10)
    Context. The mass loss from massive stars is not understood well. η Carinae is a unique object for studying the massive stellar wind during the luminous blue variable phase. It is also an eccentric binary with a period of ...
  • The VMC survey – XIII. type II cepheids in the large magellanic cloud 
    Ripepi, V; Moretti, M. I; Marconi, M; Clementini, G; Cioni, M. -R. L; de Grijs, R; Emerson, J. P; Groenewegen, M. A. T; Ivanov, V. D; Muraveva, T; Piatti, A. E; Subramanian, S (Oxford University Press on behalf of the Royal Astronomical Society, 2015-01-21)
    The VISTA (Visible and Infrared Survey Telescope for Astronomy) survey of the Magellanic Clouds System (VMC) is collecting deep Ks-band time-series photometry of the pulsating variable stars hosted in the system formed by ...
  • The VMC survey – XIV. first results on the look-back time star formation rate tomography of the small magellanic cloud 
    Rubele, S; Girardi, L; Kerber, L; Cioni, Maria-Rosa. L; Piatti, A. E; Zaggia, S; Bekki, K; Bressan, A; Clementini, G; de Grijs, R; Emerson, J. P; Groenewegen, M. A. T; Ivanov, V. D; Marconi, M; Marigo, P; Moretti, Maria-Ida; Ripepi, V; Subramanian, S; Tatton, B. L; Van Loon, J. T (Oxford University Press on behalf of the Royal Astronomical Society, 2015-05-01)
    We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJKs filters, covering 14 deg2 (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). ...

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