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Browsing IIAP Publications by Title

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  • 1-D dusty photo-ionization models of WR planetary nebulae NGC 2452 and IC 2003 
    Muthumariappan, C; Amrutha, B. M; Selvakumar, G (Elsevier B.V., 2023-01-01)
    We report dusty photo-ionization models for two Planetary Nebulae NGC 2452 and IC 2003, which have [WR] type central stars, using 1D photo-ionization code Cloudy17.02. We used the medium resolution optical spectra and ...
  • The 1.28 GHz MeerKAT Galactic Center Mosaic 
    Heywood, I; Rammala, I; Camilo, F; Cotton, W. D; Yusef-Zadeh, F; Abbott, T. D; Adam, R. M; Adams, G; Aldera, M. A; Asad, K. M. B; Bauermeister, E. F; Bennett, T. G. H; Bester, H. L; Bode, W. A; Botha, D. H; Botha, A. G; Brederode, L. R. S; Buchner, S; Burger, J. P; Cheetham, T; de Villiers, D. I. L; Dikgale-Mahlakoana, M. A; du Toit, L. J; Esterhuyse, S. W. P; Fanaroff, B. L; February, S; Fourie, D. J; Frank, B. S; Gamatham, R. R. G; Geyer, M; Goedhart, S; Gouws, M; Gumede, S. C; Hlakola, M. J; Hokwana, A; Hoosen, S. W; Horrell, J. M. G; Hugo, B; Isaacson, A. I; Jozsa, G. I. G; Jonas, J. L; Joubert, A. F; Julie, R. P. M; Kapp, F. B; Kenyon, J. S; Kotze, P. P. A; Kriek, N; Kriel, H; Krishnan, V. K; Lehmensiek, R; Liebenberg, D; Lord, R. T; Lunsky, B. M; Madisa, K; Magnus, L. G; Mahgoub, O; Makhaba, A; Makhathini, S; Malan, J. A; Manley, J. R; Marais, S. J; Martens, A; Mauch, T; Merry, B. C; Millenaar, R. P; Mnyandu, N; Mokone, O. J; Monama, T. E; Mphego, M. C; New, W. S; Ngcebetsha, B; Ngoasheng, K. J; Ockards, M. T; Oozeer, N; Otto, A. J; Passmoor, S. S; Patel, A. A; Peens-Hough, A; Perkins, S. J; Ramaila, A. J. T; Ramanujam, N. M. R; & 30 Co-authors (American Astronomical Society, 2022-02-01)
    The inner ∼200 pc region of the Galaxy contains a 4 million M⊙ supermassive black hole (SMBH), significant quantities of molecular gas, and star formation and cosmic-ray energy densities that are roughly two orders of ...
  • 1.5M Aluminizing Plant of the Indian Institute of Astrophysics 
    Saxena, A. K; Jayarajan, A. P; Kumar, K (Indian Institute of Astrophysics, Bangalore, 1980)
    The design and features of 1.5m vacuum coating plant an in house facility at the Kavalur Observatory for periodic aluminizing of astronomical optics are described. A typical performance data is given.
  • A 10-m class national large optical-IR telescope 
    Anupama, G. C; Maheswar, G; Sriram, S; Sivarani, T; Parihar, P. S; Nagabhushana, S; Angchuk, D; Barway, Sudhanshu; Bhatt, B. C; Banyal, R. K; Basheer, Alikhan; Prasanna, Deshmukh; Divakar, D. K; Dorjai, T; Goswami, A; Govinda, K. V; Jorphail, S; Kamath, U. S; Kemkar, P. M. M; Mahay, T. T; Muneer, S; Muthumariappan, C; Shantikumar, N. S; Pandey, G; Reddy, B. E; Sahu, D. K; Sandeep, D. S; Ramya, S; Stalin, C. S; Subramanian, S; Tsewang, Stanzin; Subramaniam, A (Indian Academy of Science, 2022-06)
    An observatory class national large optical-IR telescope (NLOT), is proposed to be built and located in the country. The telescope consists of a 10–12 m segmented primary. In order to cater to a diversity of observational ...
  • 100 years of photon-counting: the quest for the perfect eye 
    Morel, S; Saha, S. K (Anita Publications, 2005)
  • The 1024 channel digital correlator receiver of the Gauribidanur radioheliograph 
    Ramesh, R; Sundararajan, M. S; Sastry, Ch. V (Springer, 2006-02)
    A low frequency (40 150 MHz) radioheliograph for observations of the solar corona is in operation for the last few years at the Gauribidanur radio observatory, about 100 km north of Bangalore. The array has 32 antenna ...
  • The 1985 outburst of RS Ophiuchi - Spectroscopic results 
    Anupama, G. C; Prabhu, T. P (Indian Academy of Sciences, 1989-09)
    Results are reported from visual spectroscopy of the recurrent nova RS Oph, obtained with a Cassegrain spectrograph on the 102-cm reflector at Vainu Bappu Observatory in February-May 1985 (days 32-108 postoutburst). The ...
  • 1986 Light Curve of V711 Tau 
    Mekkaden, M. V (Konkoly Observatory, 1987-07-03)
  • The 1995 Total Solar Eclipse: An Overview 
    Singh, J (Indian Institute of Astrophysics, 1997)
    As we know, we owe the discovery of solar corona to the observation of total solar eclipse. Inspite of all that has been learned, coronal studies still remain the most important aspect of scientific investigation during ...
  • The 1995-96 decline of R Coronae Borealis: high-resolution optical spectroscopy 
    Kameswara Rao, N; Lambert, D. L; Adams, M. T; Doss, D. R; Gonzalez, G; Hatzes, A. P; James, C. R; Johns-Krull, C. M; Luck, R. E; Pandey, G; Reinsch, K; Tomkin, J; Woolf, V. M (The Royal Astronomical Society, 1999-12)
    A set of high-resolution optical spectra of R CrB acquired before, during and after its 1995-96 decline is discussed. All of the components reported from earlier declines are seen. This novel data set provides new information ...
  • The 1999 Outburst of the Recurrent Nova U Scorpii 
    Anupama, G. C; Dewangan, G. C (The American Astronomical Society, 2000-03)
    The optical spectra of the recurrent nova U Sco obtained in five epochs 0.45-42.35 days after the 1999 outburst maximum are presented here. For the first time, an outburst spectrum of U Sco has been obtained as early as ...
  • 1D radiative transfer models of 21 and 30 μm emission features in proto-planetary nebulae 
    Muthumariappan, C; Reddy, B. E (Cambridge University Press, 2012-08)
    Spectral energy distributions of six proto-planetary nebulae showing 21 and 30μ features were fit with models obtained from 1D radiative transfer code, taking FeO and MgS respectively are the carriers of the features. ...
  • 1–8 Å Coronal Background X-Ray Emission and the Associated Indicators of Photospheric Magnetic Activity 
    Ramesh, K. B; Rohini, V. S (The American Astronomical Society, 2008-10-10)
    Consistent correlations between X-ray background flux (XBF) and sunspot area over three solar cycles suggest a strong relationship between the flux emergence at the locations of strong field regions, sunspots, and the ...
  • 2.5-dimensional solution of the advective accretion disk: a self-similar approach 
    Ghosh, S; Mukhopadhyay, B (Institute of Physics, 2009-02)
    We provide a 2.5-dimensional solution to a complete set of viscous hydrodynamical equations describing accretion-induced outflows and plausible jets around black holes/compact objects. We prescribe a self-consistent advective ...
  • 20" Bhavnagar telescope: a brief history 
    Rajamohan, R; Samson, J. P. A (Indian Institute of Astrophysics, 1984)
  • The 2010 outburst and pre-outburst optical spectrum of the recurrent nova U Scorpii 
    Anupama, G. C; Kamath, U. S; Ramaprakash, A. N; Kantharia, N. G; Hegde, M; Mohan, V; Kulkarni, M; Bode, M. F; Eyres, S. P. S; Evans, A; O Brien, T. J (EDP Sciences, 2013-11)
    Aims. We study the evolution of the recurrent nova U Scorpii during its outburst in 2010. Methods. Optical spectroscopic observations of the nova were obtained during 0.83–162.5 days after outburst maximum. Optical ...
  • 22-year periodicity in solar rotation, solar wind parameters and earth rotation 
    Kirov, B; Georgieva, K; Javaraiah, J (European Space Agency, 2002-12)
    It is generally accepted that the annual variation in the Earth's rotation rate is fully determined by large-scale seasonal changes in atmospheric circulation, while the decadal changes in Earth's rotation have been shown ...
  • 22-year Periodicity in the Solar Differential Rotation 
    Javaraiah, J (Journal of Astrophysics and Astronomy, Vol. 21, No. 3 – 4, pp. 167 - 170, 2000-12)
    Using the data on sunspot groups compiled during 1879- 1975, we determined variations in the differential rotation coefficients A and Β during the solar cycle. The variation in the equatorial rotation rate A is found ...
  • 220 GHz tipping radiometer for monitoring sky opacity at Hanle 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P (Astronomical Society of the Pacific, 2002)
    A 220 GHz tipping radiometer is in operation at the Indian Astronomical Observatory, Mt Saraswati, Digpa-ratsa Ri, Hanle (Latitude 32degrees 46' 46".3 N, Longitude 78degrees 57' 51".1 E, Altitude 4500 in above msl) for ...
  • 220 GHz zenith atmospheric transparency at IAO, Hanle 
    Ananthasubramanian, P. G; Yamamoto, S; Prabhu, T. P (Kluwer Academic Publishers., 2002-02)
    We present 220 GHz (1.36 mm) measurements of zenith optical depth obtained to characterise the Indian Astronomical Observatory, Hanle (Ladakh, India) during the period from late December 1999 to early May 2000 and early ...

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