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Browsing by Author "Joshi, U. C"

Browsing by Author "Joshi, U. C"

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  • 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 ...
  • UBV photoelectric photometry of the open cluster NGC 2539 
    Joshi, U. C; Sagar, R (Astronomical Society of Indian, 1986-06)
    UBV photometric observations of 135 stars near NGC 2539, obtained using the 104-cm Sampurnanand reflector at Uttar Pradesh State Observatory during 1975-1978, are reported. The data are presented in tables and graphs and ...
  • Variability study of Mrk-421 in near IR bands from Mt. Abu observatory 
    Joshi, U. C; Baliyan, K. S; Ganesh, S (Astronomical Society of India, 2002)
    Mrk421 is the nearest, and brightest blazar detected in almost all the spectral windows, including high energy gamma-rays. It exhibits short and long timescale variations at all frequency bands. Though it has been observed ...
  • Variation of linear polarization in the R Aquarii system 
    Deshpande, M. R; Joshi, U. C; Kulshrestha, A. K; Sen, A. K; Kameswara Rao, N; Raveendran, A. V (Astronomical Society of the Pacific, 1987-01)
    Linear polarization measurements of the R Aqr system are reported here. The R Aqr system shows strong wavelength dependence of percent polarization and position angle, which are strongly time dependent also. There is a ...

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