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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Digitized archive of the Kodaikanal images: Representative results of Solar cycle variation from sunspot area determination 
    Ravindra, B; Priya, T. G; Amareswari, K; Priyal, M; Nazia, A. A; Banerjee, D (EDP Sciences, 2013-02)
    Photographic images are valuable data resources for studying long term changes in the solar magnetic field and its influence on the Earth's climate and weather. We digitized more than 100 years of white light images stored ...
  • Direct estimates of the solar coronal magnetic field using contemporaneous extremeultraviolet, radio, and white-light observations 
    Anshu Kumari; Ramesh, R; Kathiravan, C; Wang, T. J; Gopalswamy, N (IOP Publishing, 2019-08-10)
    We report a solar coronal split-band type II radio burst that was observed on 2016 March 16 with the Gauribidanur Radio Spectro-Polarimeter in the frequency range ≈90–50 MHz, and the Gauribidanur RadioheliograPH at two ...
  • Direct generation of electromagnetic radiation from a beam-plasma system 
    Krishan, V (Institute of Physics, 1980-02)
    A possible mechanism for the direct generation of electromagnetic modes of frequencies near the electron plasma frequency, is suggested. The spatial variation of the interplanetary magnetic field seems to play an essential ...
  • Directivity of solar microwave bright regions 
    Gopala Rao, U. V (D. Reidel Publishing Company, 1968-08)
  • Disappearing solar filaments and geomagnetic activity 
    Sastri, J. H (Springer, 1986-05)
    As a sequel to the recent identification of the high-speed stream as the candidate structure in the solar wind at 1 AU that is primarily responsible for the geomagnetic disturbances occasionally noticed after 'disparition ...
  • Discovering a celestial object using a non-parametric algorithm 
    Vyasanakere, Jayanth P; Bhatnagar, Siddharth; Murthy, J (Springer, 2021-12)
    We describe a method that does not use any orbital parameters, to arrive at the position and mass of a new celestial object, using high-precision orbital state vector data of the rest of the objects in the system. As ...
  • Discovery and rapid follow-up observations of the unusual type II SN 2018ivc in NGC 1068 
    Bostroem, K. A; Valenti, S; Sand, D. J; Andrews, J. E; Van Dyk, S. D; Galbany, L; Pooley, D; Amaro, R. C; Smith, N; Yang, S; Anupama, G. C; Arcavi, I; Baron, E; Brown, P. J; Burke, J; Cartier, R; Hiramatsu, D; Dastidar, R; DerKacy, J. M; Dong, Y; Egami, E; Ertel, S; Filippenko, A. V; Fox, O. D; Haislip, J; Hosseinzadeh, G; Howell, D. A; Gangopadhyay, A; Jha, S. W; Kouprianov, V; Kumar, B; Lundquist, M; Milisavljevic, D; McCully, C; Milne, P; Misra, K; Reichart, D. E; Sahu, D. K; Sai, H; Singh, A; Smith, P. S; Vinko, J; Wang, X; Wang, Y; Wheeler, J. C; Williams, G. G; Wyatt, S; Zhang, J; Zhang, X (IOP Publishing, 2020-05-20)
    We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual SNe II that exploded in NGC 1068 (D = 10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope ...
  • Discovery of a flare star near Sirius 
    Sharma, D. P; Marar, T. M. K; Seetha, S; Shyla, K. S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Rozario, M. J (D. Reidel Publishing Co., 1983-04)
    The discovery of a flare star (R.A. (1950)=6/Suph43/Supm6/Sups.07, Decl.(1950)=–16°45'24") located about 6 arc min south of Sirius is reported. During photometric observations on the night of 13 January, 1982, using the ...
  • Discovery of a large HI ring around the quiescent galaxy AGC 203001 
    Bait, Omkar; Kurapati, Sushma; Duc, Pierre-Alain; Cuillandre, Jean-Charles; Wadadekar, Yogesh; Kamphuis, Peter; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    Here we report the discovery with the Giant Metrewave Radio Telescope of an extremely large (∼115 kpc in diameter) H I ring, located around a massive quenched galaxy, AGC 203001, but off-centred with respect to it. This ...
  • Discovery of a Low-mass Companion to a Metal-rich F Star with the MARVELS Pilot Project 
    Fleming, S. W; Ge, J; Mahadevan, S; Lee, B; Eastman, J. D; Siverd, R. J; Gaudi, B. S; Niedzielski, A; Sivarani, T; Stassun, K. G; Wolszczan, A; Barnes, R; Gary, B; Nguyen, Duy Cuong; Morehead, R. C; Wan, X; Zhao, B; Liu, J; Guo, P; Kane, S. R; van Eyken, J. C; Lee, N. M. D; Crepp, J. R; Shelden, A. C; Laws, C; Wisniewski, J. P; Schneider, D. P; Pepper, J; Snedden, S. A; Pan, K; Bizyaev, D; Brewington, H; Malanushenko, O; Malanushenko, V; Oravetz, D; Simmons, A; Watters, S (IOP Publishing, 2010-08-01)
    We report the discovery of a low-mass companion orbiting the metal-rich, main sequence F star TYC 2949-00557-1 during the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS) pilot project. The host star ...
  • Discovery of a near-infrared bar and a pseudobulge in the collisional ring galaxy Cartwheel 
    Barway, Sudhanshu; Mayya, Y. D; Robleto-Orus, Aitor (Oxford University Press on behalf of the Royal Astronomical Society, 2020-09)
    We report the discovery of a bar, a pseudo-bulge, and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) Ks-band image of excellent ...
  • Discovery of an M-type companion to the Herbig Ae Star V1787 Ori 
    Arun, R; Mathew, B; Sridharan, R; Manoj, P; Narang, M; Kartha, S. S; Maheswar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2021-02)
    The intermediate-mass Herbig Ae star V1787 Ori is a member of the L1641 star-forming region in the Orion A molecular cloud. We report the detection of an M-type companion to V1787 Ori at a projected separation of 6.66 arcsec ...
  • Discovery of asteroid number 4130 
    Rajamohan, R; Bhattacharyya, J. C; Kuppuswamy, K; Paranjpye, A; Moorthy, V; Vasundhara, R (Indian Academy of Sciences, 1989-09)
  • Discovery of Dramatic Optical Variability in SDSS J1100+4421: A Peculiar Radio-loud Narrow-line Seyfert 1 Galaxy? 
    Tanaka, M; Morokuma, T; Itoh, R; Akitaya, H; Tominaga, N; Saito, Y; Stawarz, L; Tanaka, Y, T; Gandhi, P; Ali, G; Aoki, T; Contreras, C; Doi, M; Essam, A; Hamed, G; Hsiao, E. Y; Iwata, I; Kawabata, K. S; Kawai, N; Kikuchi, Y; Kobayashi, N; Kuroda, D; Maehara, H; Matsumoto, E; Mazzali, P. A; Minezaki, T; Mito, H; Miyata, T; Miyazaki, S; Mori, K; Moritani, Y; Morokuma-Matsui, Kana; Morrell, N; Nagao, T; Nakada, Y; Nakata, F; Noma, C; Ohsuga, K; Okada, N; Phillips, M. M; Pian, E; Richmond, M. W; Sahu, D. K; Sako, S; Sarugaku, Y; Shibata, T; Soyano, T; Stritzinger, M. D; Tachibana, Y; Taddia, F; Takaki, K; Takey, Ali; Tarusawa, K; Ui, T; Ukita, N; Urata, Y; Walker, E. S; Yoshii, T (IOP Publishing, 2014-10-01)
    We present our discovery of dramatic variability in SDSS J1100+4421 by the high-cadence transient survey Kiso Supernova Survey. The source brightened in the optical by at least a factor of three within about half a day. ...
  • The discovery of fluorine in cool extreme helium stars 
    Pandey, G (The University of Chicago Press, 2006-08-21)
    Neutral fluorine (F I) lines are identified in the optical spectra of cool extreme helium (EHe) stars. These are the first F I lines identified in a star's spectrum, and they provide the first measurement of fluorine ...
  • Discovery of Main-belt Comet P/2006 VW139 by Pan-STARRS1 
    Hsieh, H. H; Yang, Bin; Haghighipour, N; Kaluna, H. M; Fitzsimmons, A; Denneau, L; Novakovic, B; Jedicke, R; Wainscoat, R. J; Armstrong, J. D; Duddy, S. R; Lowry, S. C; Trujillo, C. A; Micheli, M; Keane, J. V; Urban, L; Riesen, T; Meech, K. J; Abe, S; Cheng, Yu-Chi; Chen, Wen-Ping; Granvik, M; Grav, T; Ip, Wing-Huen; Kinoshita, D; Kleyna, J; Lacerda, P; Lister, T; Milani, A; Tholen, D. J; Vereš, P; Lisse, C. M; Kelley, M. S; Fernández, Y. R; Bhatt, B. C; Sahu, D. K; Kaiser, N; Chambers, K. C; Hodapp, K. W; Magnier, E. A; Price, P. A; Tonry, J. L (IOP Publishing, 2012-03-20)
    The main-belt asteroid (300163) 2006 VW139 (later designated P/2006 VW139) was discovered to exhibit comet-like activity by the Pan-STARRS1 (PS1) survey telescope using automated point-spread-function analyses performed ...
  • Discovery of Relatively Hydrogen-poor Giants in the Galactic Globular Cluster omega Centauri 
    Hema, B. P; Pandey, G (IOP Publishing, 2014-09-10)
    In this Letter, the results of our low-resolution spectroscopic survey for identifying hydrogen-deficient stars in the red giant sample of the globular cluster ω Cen are reported. Spectral analyses were carried out on the ...
  • Discovery of soft and hard X-ray time lags in low-mass AGNs 
    Mallick, L; Wilkins, D. R; Alston, W. N; Markowitz, A; Marco, B. De; Parker, M. L; Lohfink, A. M; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2021-05)
    The scaling relations between the black hole (BH) mass and soft lag properties for both active galactic nuclei (AGNs) and BH X-ray binaries (BHXRBs) suggest the same underlying physical mechanism at work in accreting BH ...
  • Discovery of ubiquitous lithium production in low-mass stars 
    Bharat Kumar, Y; Reddy, B. E; Campbell, S. W; Maben, Sunayana; Zhao, G; Ting, Yuan-Sen (Springer Nature, 2020-11)
    The vast majority of stars with mass similar to that of the Sun are expected to destroy lithium (Li) gradually over the course of their lives, via low-temperature nuclear burning. This has now been supported by observations ...
  • Discrete space theory of radiative transfer 
    Peraiah, A (Cambridge University Press, 1984)
    A discrete space theory for radiative transfer based on invariant imbedding is described, along with applications. An interaction principle is defined for the relation between incident and emitted radiation from an optically ...

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