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  • High resolution imaging of the sun and other extended sources 
    Krishnakumar, V; Venkatakrishnan, P (Astronomical Society of the Pacific, 1998)
    The functional form of the long exposure OTF P(u,v) is known (Fried 1966; Kirshnakumar & Venkatakrishnan 1997a) and i(x,y) is what we record. The knowledge of P(u,v) is complete once ro is estimated. Our aim is to recover ...
  • High resolution imaging: detectors and applications 
    Saha, S. K (Pan Stanford publishing, 2015)
    Interferometric observations need snapshots of very high time resolution of the order of (i) frame integration of about 100 Hz or (ii) photon-recording rates of several megahertz (MHz). Detectors play a key role in ...
  • High resolution interferometry of astrophysical objects 
    Raju, K. P (Astronomical Society of India, 1993)
    The thesis comprises studies on two distinctly diverse astrophysical situations; one on the outer envelope of a late-type star at its main sequence stage (solar corona), the other on the ionized cloud surrounding an ...
  • High resolution IRAS maps of spiral galaxies 
    Rengarajan, T. N; Ghosh, S. K; Verma, R. P (Astronomical Society of India, 1993)
    High resolution maps of nine spiral galaxies have been generated in the four IRAS bands using the High Resolution (HIRES) routine. These are used in conjunction with maps in H-alpha, CO, HI, radio continuum etc. to study ...
  • High resolution mapping in the far-infrared band 
    Rengarajan, T. N (Astronomical Society of India, 1993)
    The earth's atmosphere is opaque to the far-infrared (far-IR) radiation) and hence observations have to be carried out at altitudes above 12 km using telescopes transported by aircraft, balloon or satellite. The restriction ...
  • High Resolution Multislit Spectroscopy of Solar Corona in two lines during the Total Solar Eclipse of Oct. 24, 1995 
    Singh, J; Gupta, S. S; Cowsik, R (Indian Institute of Astrophysics, Bangalore, 1997)
    Two coronal emission lines 5303 Armstrong (Fe XIV) and 6374 Armstrong (Fe X) corresponding to ionization temperatuess of 2 and 1 million degree kelvin respectively were used to obtain the high resolution coronal spectra ...
  • High Resolution Observations of Solar Radio and X-Ray Bursts and their Imterpretation 
    Degaonkar, S. S (Indian Institute of Astrophysics, Bangalore, 1986)
    High resolution observations in the radio range from the ground and X-rays from satellites during the past few years have provided new insights into the nature of emission processes and energies of solar eruptions. It is ...
  • High Resolution Radio Spectroscopy of Continuum Radio Bursts at Decameter Wavelengths from the Sun 
    Subramanian, K. R (Indian Institute of Astrophysics, Bangalore, 1992-03)
  • A high resolution spectroscopic study of XX Ophiuchi 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of India, 2001)
    The star XX Oph has been known to exhibit peculiar spectral variabilities since the work of Merrill in 1924. A high resolution spectroscopic study of the XX Oph spectra taken in July 1996 and later in June 1997 also exhibit ...
  • High Resolution Spectroscopy of QY Sge 
    Kameswara Rao, N; Goswami, A; Lambert, D. L (Astronomical Society of India, 2002-09)
    High resolution spectral analysis of QY Sge, a post AGB star is presented here. The spectrum of QY Sge is characterized by three major components: absorption lines representative of a G supergiant, sharp emission lines ...
  • High resolution spectroscopy of R Coronae Borealis during the 1988-1989 minimum 
    Lambert, D. L; Kameswara Rao, N; Giridhar, S (Indian Academy of Sciences, 1990-12)
    Moderate-resolution spectra of the C2 Swan 0-1 bandhead, the Na I D lines and the K I resonance lines near 7660 A obtained at minimum light during the 1988-1989 decline of R CrB are discussed and interpreted in terms of a ...
  • High resolution spectroscopy of the high latitude rapidly evolving post-AGB star SAO 85766 (= IRAS 18062+2410) 
    Parthasarathy, M; García-Lario, P; Sivarani, T; Manchado, A; Sanz Fernández de Córdoba, L (European Southern Observatory, 2000-05)
    SAO 85766 (b = +20o) is an IRAS source with far-infrared colours similar to planetary nebulae. According to the HDE catalogue, its spectrum in 1940 was that of an A5 star. The UV fluxes and colours derived from data obtained ...
  • High resolution spectroscopy of the hot post-AGB stars IRAS 13266-5551 (CPD-55 5588) and IRAS 17311-4924 (Hen3-1428) 
    Sarkar, G; Parthasarathy, M; Reddy, B. E (EDP Sciences, 2005-03)
    High resolution spectra covering the wavelength range 4900 Å to 8250 Å of the hot post-AGB stars IRAS 13266-5551 (CPD-55 5588) and IRAS 17311-4924 (Hen3-1428) reveal absorption lines of C II, N II, O II, Al III, Si III and ...
  • High resolution spectroscopy of the R Coronae Borealis star, V854 Centauri, during a deep minimum 
    Kameswara Rao, N; Lambert, D. L (American Astronomical Society, 1993-05)
    The R Coronae Borealis star V854 Cen was observed at minimum light (V about 15) at high spectral resolution from 5480 to 7070 A. The spectrum consists of three components: a continuum devoid of photospheric lines, a ...
  • High Resolution Spectroscopy of the Semi-Regular Variable LR Sco 
    Giridhar, S; Kameswara Rao, N; Lambert, D. L (Indian Academy of Sciences, 1992)
    A detailed spectroscopic investigation of LR Sco which was earlier misclassified as R CrB star is made. Atmospheric parameters and elemental abundances are determined using detailed depth-dependent model atmospheres and ...
  • High resolution spectroscopy with a 10-m class telescope 
    Giridhar, S (Astronomical Society of India, 2000)
  • High Resolution Spectroscopy with Submillimeter-Wave 
    Kumar, V; Dave, H (Astronomical Society of India, 2003)
    In order to explain the characteristic features of planetary atmosphere, detection and precise measurements of environmentally important gases such as CO, CIO, No becomes necessary. Since most of the polyatomic molecules ...
  • High Resolution Stellar Spectroscopy with VBT Echelle Spectrometer 
    Kameswara Rao, N; Sriram, S; Jayakumar, K; Gabriel, F (Indian Academy of Sciences, 2005-09)
    The optical design and performance of the recently commissioned fiber fed echelle spectrometer of 2.34 meter Vainu Bappu Telescope are described. The use of it for stellar spectroscopic studies is discussed.
  • High resolution studies of intermediate drift bursts 
    Fernandes, F. C. R; Krishan, V; Andrade, M. C; Cecatto, J. R; Freitas, D. C; Sawant, H. S (Elsevier B. V., 2003)
    We report high resolution observations of the Intermediate Drift (IMD) bursts in decimetric band (ν = 950 2650 MHz). With a time resolution of 20 - 50 ms and a frequency resolution of 4 - 10 MHz, we are able to estimate ...
  • High resolution time profile of decimetric type-III bursts 
    Cecatto, J. R; Sawant, H. S; Fernandes, F. C. R; Krishan, V; Neri, J. A. C. F; Moraes, J. C (Elsevier B. V., 2003)
    Type-III bursts are signatures of the electron beams accelerated during the solar flares, their observation and investigation provide information of the acceleration processes, the characteristics of the exciting agent and ...

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