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Browsing IIAP Publications by Title

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  • Observations of the supernova remnants HB 9 and IC 443 at 34.5 MHz 
    Dwarakanath, K. S; Shevgaonkar, R. K; Sastry, Ch. V (Indian Academy of Sciences, 1982-06)
    The results of observations of the two SNRs HB 9 and IC 443 are discussed. A map of HB 9 is presented whose main features are an elongation in the northerly direction and a strong region at the center of the map. The ...
  • Observations of the type IIp supernova 2001X during the plateau phase 
    Anupama, G. C; Sahu, D. K (Astronomical Society of India, 2002-09)
  • Observations of variables 
    Rosario, M. J; Muneer, S; Raveendran, A. V; Mekkaden, M. V (IBVS / Konkoly Observatory, 2010-12)
    UX Ari was observed on a total of 33 nights during December 2008-February 2010 in standard Johnson BV bands with the 34-cm tel escope of Vainu Bappu Observatory, Kavalur. All the measurements were made with respect to 62 ...
  • Observations of weak G-band stars 
    Kameswara Rao, N (Royal Astronomical Society, 1978-11)
    Scanner observations of the strengths of the G-band stars of CH at λ4300 and of the NH bands at λ3360 were obtained fro 10 weak G-band stars (wG stars) along with 2 normal field giants of spectral types G to K. the ...
  • Observations of X-Per in optical domain 
    Sharma, D. P; Nagaraja, B. V; Bhattacharyya, J. C; Mohin, S; Raveendran, A. V (Kluwer Academic Publishers, 1983-09)
    We have monitored the X-ray source X-Per (4U 0352+30) on 31 August, 1979 through aU filter for about 1.5 hr using 102-cm telescope of Kavalur observatory. During this period intensity of X-Per fluctuated for some time, on ...
  • Observations on spread-F at Kodaikanal 
    Sastri, J. H; Murthy, B. S (National Institute of Science Communication And Information Resources, 1975-06)
    A study of quarter-hourly ionograms of Kodaikanal (geomag. lat: O'6oN; dip: 3'5°N) showed several instances when the spread-F disappears and subsequently. reappears in two hrs or less during it night. Investigation of such ...
  • Observations on the Fine Structures in Solar Decametric Radio Emission 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V (Indian Institute of Astrophysics, Bangalore, 1984)
    The Solar decametric radio emission consists of a variety of fine structures. This reflects the complexity of the corona at this level. Two observations, viz. absorption bursts and short duration narrow band bursts are ...
  • Observations on the occultation of the radio source Tauras A by the solar corona during June 1971 
    Sastry, Ch. V; Subramanian, K. R (National Institute of Science Communication and Information Resources, 1974-09)
    Observations on the occultation of the radio source Tamas A (3C 144) during June 1971 at a wavelength of 12 m are presented. It is tentatively observed that there is no strong dependence between the amount of scattering and ...
  • Observations on the slowly varying component of solar radio emission at decameter wavelengths 
    Sastry, Ch. V; Shevgaonkar, R. K; Ramanuja, M. N (Springer, 1983-09)
    The authors have made two-dimensional maps of the slowly varying component (SVC) of solar radio emission at a frequency of 34.5 MHz with half power beam width of 26'/40'. It is found that a majority of SVC sources have ...
  • Observations on the Time and Frequency Structure of Solar Decameter Radio Bursts 
    Sastry, Ch. V (D. Reidel Publishing Co., 1973-01)
    Solar radio bursts were observed with a 4-channel radiometer and polarization analyser at wavelenghts around 12 m. The time and frequency resolutions were 10 ms and 100 kHz respectively. Observations on the duration, time ...
  • Observations on the time structure of solar radio bursts at a wavelength of 12 M 
    Sastry, Ch. V (D. Reidel Publishing Company, 1969-12)
  • Observations on the Unusual States in the Normal Patterns of the Private Behavior During the Total Solar Eclipse 
    Parthasarathy, M. D; Kulkarni, A. G (Indian Institute of Astrophysics, Bangalore, 1997)
    Systematically planned observations conclusively reveal that sudden and large natural changes in the ambient light conditions during a total solar eclipse for a few minutes, initiates and cause marked alterations in the ...
  • Observations with the 3.6-meter Devasthal optical telescope 
    Sagar, R; Kumar, B; Sharma, S (Indian Academy of Sciences, 2020-12)
    The 3.6-meter Indo–Belgian Devasthal optical telescope (DOT) has been used for optical and near-infrared (NIR) observations of celestial objects. The telescope has detected stars of B=24.5±0.2,R=24.6±0.12 and g=25.2±0.2 ...
  • Observations with the High Altitude GAmma Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    For several decades, it was thought that astrophysical sources emit high energy photons within the energy range of the gamma-ray region of the lectromagnetic spectrum also. These photons originate from interactions of high ...
  • Observations with the High Altitude GAmma-Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Manoharan, J; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S. S; Vishwanath, P. R; Yadav, K. K (Copernicus Publications, 2011-11)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m amsl, in the Ladakh region of the Himalayas (Northern India). It constitutes the first phase of the HImalayan ...
  • Observed polarization of brown dwarfs suggests low surface gravity 
    Sengupta, S; Marley, M. S (IOP Publishing, 2010-10-20)
    Light scattering by atmospheric dust particles is responsible for the polarization observed in some L dwarfs. Whether this polarization arises from an inhomogeneous distribution of dust across the disk or an oblate shape ...
  • Observing the GRB remnants 
    Bhargavi, S. G; Cowsik, R; Perna, R (Astronomical Society of the Pacific, 2004-06)
    Following the predictions of Perna, Reymond & Loeb (2000) we have proposed an observational program to search for the GRB remnants in nearby galaxies using the telescopes of Indian Institute of Astrophysics, Bangalore. We ...
  • Occultation of 2UCAC 42376428 by (423) Diotima on 2005 March 06 
    Vasundhara, R; Kuppuswamy, K; Ramamoorthy, S; Velu, C; Venkataramana, A. K (Astronomical Society of India, 2006-03)
    Observations of the occultation of the star 2UCAC 42376428 by (423) Diotima on 2005 March 06 at the Vainu Bappu Observatory are reported. The observed mid time of the event at 15:12:25.1 UT occurred 3.4 s later than the ...
  • Occultation of a solar active region at 1.5 GHz during the eclipse of November 3, 1994 
    Subramanian, K. R; Sawant, H. S; Fernandes, F. C. R; Cecatto, J. R (EDP Sciences, 2006-03)
    We observed the solar eclipse of November 3, 1994 with a 4-m diameter antenna and a radio spectrograph operating at 1.5 ± 0.05 GHz with a time resolution of 100 ms. Here we present the observations of the occultation of ...
  • Occultation of SAO 185428 by 336 Lacadiera 
    Paranjpye, A; Babu, G. S. D (Indian Academy of Sciences, 1986)

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