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Browsing Publications of Astronomical Society of India by Title

Browsing Publications of Astronomical Society of India by Title

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  • U-shaped type II solar radio bursts associated with 1980 March 28 flare 
    Markeev, A. K; Formichev, V. V; Chertok, I. M; Bhatnagar, A; Jian, R. M; Shelke, R. N; Bhonsle, R. V (Astronomical Society of India, 1983-12)
    The observations of the 1980 March 28, 2B flare in optical, radio microwave and metric and x-ray wavelengths are presented. In the dynamic radio spectrum, unusual and rare U-shaped type II radio bursts associated with this ...
  • UBV CCD standards in two galactic directions-II 
    Mohan, V; Sanwal, B. B; Paliwal, D. C; Pandey, A. K; Bhatt, B. C; Robin, A. C (Astronomical Society of India, 1996)
  • UBV CCD standards near 5C1 radio sources at intermediate galactic latitude I 
    Mohan, V; Ojha, D. K; Bienayme, O; Paliwal, D. C; Pandey, A. K; Robin, A. L; Bhatt, B. C (Astronomical Society of India, 1994)
    We have been doing a photometric and astrometric sample survey programme on Schmidt plates in a few selected directions in the Galaxy with an aim to study galactic stellar populations. In order to calibrate Schmidt plates ...
  • 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 ...
  • UBV photometry of comet Swift-Tuttle (1992t) 
    Padalia, T. D; Gupta, S. K; Srivastava, R. K; Chaubey, U. S (Astronomical Society of India, 1993)
    The comet Swift-Tuttle (1992t) was observed through UBV filters during twelve nights in December 1992. Magnitude variations of six circular zones from the center of the cometary head have been given. On the night of 17 ...
  • UBV photometry of the eclipsing binary R Canis Majoris 
    Radhakrishnan, K. R; Sarma, M. B. K; Abhyankar, K. D (Astronomical Society of India, 1985-09)
  • UBV photometry of two eclipsing binary stars 
    Chaubey, U. S; Singh, Mahendra (Astronomical Society of India, 1984-03)
    UBV light curves of the eclipsing binary systems V364 Cas and MM Cas are presented. A total of eight photoelectric times of minimum light for these stars were derived. The UBV photometric data of V364 Cas show that the ...
  • UBVRI CCD photometric studies of open clusters Berkeley 15, Czernik 18 and NGC 2401 
    Sujatha, S; Babu, G. S. D; Ananthamurthy, S (Astronomical Society of India, 2004-12)
    CCD photometric observations of three open clusters Berkeley 15 (=OCl 414), Czernik 18 (=OCl 426) and NGC 2401 (=OCl 588), obtained for the first time in UBVRI filters down to V=20 mag, are presented here. They are located ...
  • UBVRI CCD photometry of the OB associations Bochum 1 and Bochum 6 
    Yadav, R. K. S; Sagar, R (Astronomical Society of India, 2003)
    We report the first deep $UBVRI$ CCD photometry of 2460 stars in the field of two poorly studied OB associations Bochum 1 and Bochum 6. We selected 15 and 14 probable members in Bochum 1 and Bochum 6 respectively using ...
  • UBVRI CCD photometry of the two southern galactic star clusters Berkeley 79 and Trumpler 11 
    Sagar, R; Cannon, R. D (Astronomical Society of India, 1994)
  • Ultra rapid variability in gamma CAS and lambda ERI 
    Chakraborty, A; Anandarao, B. G; Swaminathan, R (Astronomical Society of India, 1993)
    We present here preliminary results of observations on two Be stars gamma Cas and lambda Eri made during 27-30 December 1992 and 14-15 February 1993.
  • Ultra Violet Imaging Telescope (UVIT) Science* 
    Kameswara Rao, N (Astronomical Society of India, 2003)
    Some of the significant areas of astronomy that would be persued by UVIT, one of the payloads on the proposed Indian multiwavelength astronomy satellite ASTROSAT, is described. Some of the considerations and uniqueness of ...
  • The Ultra Violet Imaging Telescope: Mechanical Design 
    Pati, A. K; Mahesh, P. K; Nagabhushana, S; Subramanian, V. K (Astronomical Society of India, 2003)
    The Ultra Violet Imaging Telescope (UVIT) is one of the major scientific instruments on the proposed ASTROSAT mission of the Indian Space Research Organisation. The design of a telescope to meet the scientific requirements ...
  • Ultraviolet astronomy with the International Ultraviolet Explorer 
    Gondhalekar, P. M (Astronomical Society of India, 1981-06)
    Astronomical research with the International Ultraviolet Explorer has been reviewed.
  • Understanding the behavior of energy X-rays from the black hole candidate GRS 1915+105 
    Nandi, A; Chakrabarti, S. K (Astronomical Society of India, 2002)
    Black Hole candidate GRS 1915+105 shows a very interesting behaviour at high energy X-rays. For instance, it shows quasi-Periodic Oscillations (QPO) only at high energies. Also the spectral slopes at high energies vary and ...
  • Unidentified Sources in the FIRSSE Catalogue 
    Seal, P; Shivanandan, K (Astronomical Society of Indian, 1989-03)
    Thirty four sources are identified from 159 unidentified FIRSSE sources by matching the positions of the sources in different catalogues. Eighty three sources are examined optically on the POSS-E prints. We also discuss ...
  • An Upper Limit on Flux Density of Radio Bursts at 327 MHz from MXB 1730-335 
    Rao, P. A (Tata Institute of Fundamental Research, Bombay, 1980-06)
    The rapid X-ray burster MXB 1730-335 was observed with the Ooty Radio Telescope on 14 and 14 August 1979. During the period of our observations the X-ray buster was active. No radio bursts were recorded and the upper limit ...
  • UPSO three channel fast photometer 
    Gupta, S. K; Sagar, R; Joshi, S; Ashoka, B. N; Babu, V. C; Seetha, S; Girish, V (Astronomical Society of India, 2001)
    The design and performance of a modular portable three channel fast photometer is described. It can be disassembled as single individual channels such that the system can also be used as a single channel photometer. The ...
  • Using solar oscillations to constrain the equation of state and low-temperature opacities 
    Guzik, J. A; Cox, A. N; Swenson, F. J (Astronomical Society of India, 1996)
    Because thousands of solar p-mode oscillation frequencies have been measured to high accuracy, direct comparisons between calculated and observed frequencies are an excellent means of testing solar interior physics. Here ...
  • Utilization of solar eclipse for S&T popularization : NCSTC's efforts and future programs 
    Kamble, V. B (Astronomical Society of India, 1998)
    Built around the event of the Total Solar Eclipse of October 24, 1995, NCSTC and Vigyan Prasar jointly undertook a countrywide programme on popularization of Astronomy in particular and S&T in general, addressing at the ...

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