IIA Institutional Repository

Browsing by Author "Joshi, U. C"

Browsing by Author "Joshi, U. C"

Sort by: Order: Results:

  • Monitoring of AGNs for variability from MIRO 
    Baliyan, K. S; Joshi, U. C; Ganesh, S (Astronomical Society of India, 2005-06)
    As a long term programme, a sample of blazars is being monitored from Mt Abu Infrared Observatory (MIRO). Blazars are the radio-loud AGNs with polarized, highly luminous and rapidly variable non-thermal continuum emission ...
  • Multicolour surface photometry of galaxies : Mrk 35 and Mrk 799 
    Chitre, A; Joshi, U. C; Srivastava, J. B (Astronomical Society of India, 1996)
    Imaging photometry of two peculiar galaxies Mrk 35 and Mrk 799 has been carried out using a CCD camera and broad band filters. Both the galaxies are highly disturbed and the morphologies of the galaxies are quite complex. ...
  • Multiwavelength study of the inner regions of the Milky Way Galaxy 
    Ganesh, S; Joshi, U. C; Baliyan, K. S; Omont, A; Simon, G (Astronomical Society of India, 2005-06)
    The inner regions of the Milky Way have received a lot of attention in recent years. Multiwavelength observations have been made at varying spatial, temporal and spectral resolutions. We have studied the inner regions of ...
  • A near infrared polarimeter for astrophysical studies 
    Joshi, U. C; Manian, K. S. B; Chauhan, J. S; Shah, V; Chitre, A; Ganesh, S; Deshpande, M. R (Astronomical Society of India, 1997)
    A state-of the-art near infrared photo polarimeter was designed and developed at Physical Research Laboratory, Ahmedabad, India to undertake the study of star forming regions, symbiotic stars and AGB stars etc. The instrument ...
  • Near Infrared polarimeter for extended sources 
    Manian, K. S. B; Shah, V; Thomas, M; Joshi, U. C; Ganesh, S (Astronomical Society of India, 1999)
    A state of art near IR polarimeter was designed and developed at Physical Research Laboratory, Ahmedabad and the polarimeter is operational for the last three years. During the last one year a new mode of operation has ...
  • Near Infrared Survey of the Galactic Nuclear Bulge Region 
    Baliyan, K. S; Ganesh, S; Joshi, U. C; Glass, I. S (Astronomical Society of India, 2003)
    Inner 300 pc of the Galactic Center region is surveyed with the SIR-IUS camera mounted on the InfraRed Survey Facility (IRSF) telescope of the SAAO, during June-July 2002, resulting in the deepest near infrared view of the ...
  • The Occultation of BD - 19 4222 by Uranus on 1981 April 26 
    Mahra, H. S; Pandey, A. K; Joshi, U. C; Mohan, V (Astronomical Society of India, 1983-06)
    From the observations of the occultation of BD - 194222 by Uranus on 1981 April 26 the temperature profiles of the Uranian upper atmosphere have been obtained. The mean temperature of the upper atmosphere of Uranus in the ...
  • On the nature of radiation from the nucleus of a CD galaxy A0779 
    Deshpande, M. R; Joshi, U. C (Astronomical Society of India, 1993)
    An attempt is made to detect synchrotron radiation from the nucleus of a CD galaxy A-0779 through polarization studies. We have detected a high degree of polarization (up to 9 percent in ultraviolet) with a bimodal ...
  • Photoionization cross sections for the Fe XVII ion 
    Baliyan, K. S; Joshi, U. C (Astronomical Society of India, 2000)
  • Photometry of Comet P/Halley on 1986 March 19 
    Sen, A. K; Deshpande, M. R; Joshi, U. C (Astronomical Society of India, 1991)
    Photometric observations of the Comet P/Halley are described with specific data given regarding the fluxes in the coma and the dust tail and their molecular contents. The observed magnitude of the solar-type star HD 105590 ...
  • Places of formation of nineteen nearby classical Cepheids 
    Joshi, U. C (Astronomical Society of India, 1982-09)
    Places of formation of 10 nearby classical Cepheids have been computed in a model of our Galaxy which has axisymmetric and spiral-like components. For the axisymmetric components Schmidt's (1965) model is used, and spiral-like ...
  • Polarimetric observations of comet P/Halley on 19 March 1986 
    Sen, A. K; Joshi, U. C; Deshpande, M. R; Babu, G. S. D; Kulshrestha, A. K (European Southern Observatory, 1988-10)
    Optical linear polarization data are presented for the coma and tail region of comet P/Halley observed on 19 March 1986. Polarization in the continuum has been found to increase with wavelength while the position angle ...
  • Polarimetric observations of hydrogen deficient stars 
    Raveendran, A. V; Kameswara Rao, N; Deshpande, M. R; Joshi, U. C; Kulshrestha, A. K (Reidel Publishing Company, 1986)
    Polarimetric observations of HD 30353, SU Tau, XX Cam, R CrB, UV Cas, BD +13°3224, BD +10°2179 and HD 124448 are presented. The linear polarization of HD 30353 is found to vary appreciably at Hα over a time scale as short ...
  • Polarimetry of Comet P/Halley - Properties of dust 
    Sen, A. K; Deshpande, M. R; Joshi, U. C; Kameswara Rao, N; Raveendran, A. V (European Southern Observatory, 1991-02)
    Comet P/Halley was observed polarimetrically for seven nights in IHW and other continuum filters, during its pre- and postpreihelion passages. These polarimetric observations have been combined with the observations taken ...
  • Polarimetry of Supernova SN 1987A - A Dust Shell Model 
    Joshi, U. C; Sen, A. K; Deshpande, M. R; Jain, Rekha (Indian Institute of Astrophysics, 1988)
    Polarimetric measurements of SN1987A in BVR bands were made on March 6 and 7. These observations along with the polarimetric data reported by various other authors within first 30 days of explosion have been discussed. ...
  • PRLNIC3 observations of star forming cloud L1340 
    Ganesh, S; Joshi, U. C; Baliyan, K. S; Shah, C. R; Jain, J. K; Rajpurohit, G. S; Sanchawala, K; Saha, A. B (Astronomical Society of India, 2001)
    Due mainly to high extinction in optical, the structure of our galaxy, Milky Way, is not very well understood. The Galactic disk and bulge contain a host of heavily reddened open clusters which are deeply embedded within ...
  • Recent development in optical and IR polarimetry 
    Joshi, U. C (Astronomical Society of India, 1993)
    Polarimetry in recent years has matured and high precision measurements, from radio to UV wavelength, are possible in various modes: photo polarimetry, spectropolarimetry or imaging polarimetry. Within the country polarization ...
  • Simultaneous imaging in optical and near-IR bands 
    Vadher, N. M; Shah, A. B; Shroff, A. J; Joshi, U. C (Astronomical Society of India, 2000)
    It is very important to have simultaneous observations in optical and near IR bands to understand several astrophysical phenomena. One problem is to know the nature of the central engine in blazars, which are in general ...
  • Study of the Galactic Cluster NGC 581 
    Sagar, R; Joshi, U. C (Astronomical Society of India, 1978-03)
    Photoelectric magnitudes and colours in the UBV system have been determined for 73 stars in NGC 581. The value of the interstellar reddening is 0m.38. The distance modules to the cluster is estimated at 12m.16 plus or ...
  • Study of variability in BL Lac objects 
    Baliyan, K. S; Ganesh, S; Joshi, U. C; Shah, C. R; Vadher, N. M; Deshpande, M. R (Astronomical Society of India, 2001)
    We have monitored some of the BL Lac objects, such as OJ287, Mrk 421, Mrk 501 etc from Mt Abu Infrared Observatory, using optical photopolarimeter, CCD and NICMOS-3 IR array mounted at the Cassegrain focus of the 1.2 m ...

Search DSpace

Browse

My Account