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Browsing Publications of Astronomical Society of India by Subject "Photometry"

Browsing Publications of Astronomical Society of India by Subject "Photometry"

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  • Barthakur, N. K; Duorah, H. L (Astronomical Society of India, 1996)
    The extinction coefficients in UBV filters were determined using the 15cm reflector at Guwahati University Observatory, Jalukbari during January - March, 1994, January - March, 1995 with photometric observations. The ...
  • Nilakshi; Yadav, R. K. S; Mohan, V; Pandey, A. K; Sagar, R (Astronomical Society of India, 1999)
    The CCD magnitudes in Johnson BV and Cousins RI photometric passbands are determined for 18 stars in the field of GRB 990123. These mesurements can be used in carrying out precise CCD photometry of the optical transient ...
  • Durgapal, A. K; Pandey, A. K; Mohan, V (Astronomical Society of India, 1997)
    CCD observations of the open cluster King 7 and two nearby fields have been made in the UBVRI passbands down to V ~ 20.0 mag. From the colour-colour diagram the reddening is estimated to be 1.25mag. Comparison of the ...
  • Pandey, A. K; Bhatt, B. C; Mohan, V; Paliwal, D. C; Mahra, H. S (Astronomical Society of India, 1994)
  • Bhatt, B. C; Pandey, A. K; Mahra, H. S; Paliwal, D. C (Astronomical Society of India, 1994)
  • Stalin, C. S; Gopal-Krishna; Sagar, R; Wiita, P. J (Astronomical Society of India, 2002-09)
    In order to address a currently much debated issue, we are carrying out a systematic search for intra-night optical micro-variability in major classes of powerful (M'II ~ -23.0 mag) active galactic nuclei (AGNs). Our ...
  • Sagar, R; Naidu, B. N; Mohan, V (Astronomical Society of India, 2001)
    We present the V I CCD photometric observations of about 5500 stars up to a limiting magnitude of V ~ 20 in an area of ~ 16? x 16? around the cluster NGC 6631. The cluster parameters determined for the first time by fitting ...
  • Kilambi, G. C; Rahman, A (Astronomical Society of India, 1993-03)
    An analysis of UBVR light variations of AD Canis Minoris (CMi) is presented. The mean effective temperature derived from the intrinsic (B - V) index is estimated to be 7400 K +/- 100 K whereas that of the (V - R) index ...
  • Kilambi, G. C; Rahman, A (Astronomical Society of India, 1993)
    UBV broadband photoelectric photometry of dwarf cepheid DY Pegasus is presented. Using the observed light variations of this pulsating variable, mass, radius, gravity and temperature variations over a pulsational cycle ...
  • Kulkarni, A. G; Vivekananda Rao, P (Astronomical Society of India, 1977-09)
  • Sagar, R; Mohan, V; Pandey, S. B; Pandey, A. K; Stalin, C. S; Castro-Tirado, A. J (Astronomical Society of India, 2000)
    The CCD magnitudes in Johnson V and Cousins R and I photometric passbands are determined for GRB 000301C afterglow starting ~ 1.5 day after the γ - ray burst. In fact we provide the earliest optical observations for this ...
  • Venkat Rao, G (Astronomical Society of India, 1990-03)
    Design and performance of a high-speed two-star photometer are presented in this paper. It is an ideal instrument for investigations of time variations of variable stars
  • Sujatha, S; Babu, G. S. D; Ananthamurthy, S (Astronomical Society of India, 2006)
    The first CCD photometric UBVRI observations of the open clusters NGC 1857 (Czernik 20, OCl 427) and Czernik 25 (OCl 493) are presented. The observations were obtained on 28 November 2003 with the 2m Himalayan Chandra ...
  • Ramaprakash, A. N (Astronomical Society of India, 2002)
    The IUCAA 2m telescope which is scheduled to be available for observations in early 2002, will initially have two instruments at its f/10 Cassegrain focii - the IUCAA FAint Object Spectrograph Camera (IFOSC) and the ...
  • 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. ...
  • Sharma, S; Ogura, K; Pandey, A. K; Ojha, D. K; Bhatt, B. C (Astronomical Society of India, 2007)
    We present near-infrared J H photometry and optical slitless spectroscopy of stars in the field of the young cluster Be 59. The J /(J- H )colour-magnitude diagram of the cluster yields a distance modulus of (m - M )0= 10.0 ...
  • Parihar, P. S; Sahu, D. K; Bhatt, B. C; Subramaniam, A; Anupama, G. C; Prabhu, T. P (Astronomical Society of India, 2003)
    We present the estimates of the night sky extinction at the Indian Astronomical Observatory. Also presented are the estimates of the night sky brightness. The extinction in the U band at IAO is found to be lower than the ...
  • Sagar, R (Astronomical Society of India, 2002)
    Broad band optical photometric observations of five Gamma-ray burst (GRB) afterglows (GRB 990123, GRB 991208, GRB 991216, GRB 000301c and GRB 000926) are taken from Nainital during 1999 and 2000. These in combination with ...
  • Sagar, R; Stalin, C. S; Bhattacharya, D; Pandey, S. B; Mohan, V; Castro-Tirado, A. J; Pramesh Rao, A; Trushkin, S. A; Nizhelskij, N. A; Bremer, M; Castro Ceron, J. M (Astronomical Society of India, 2001)
    We report photometric observations of the optical afterglow of GRB 010222 in V, R and I passbands carried out between 22-27 February 2001 at Nainital. We determine the CCD Johnson BV and Cousins RI photometric magnitudes ...
  • Sagar, R; Pandey, A. K; Mohan, V; Yadav, R. K. S; Nilakshi; Bhattacharya, D; Castro-Tirado, A. J (Astronomical Society of India, 1999)
    The CCD magnitudes in Johnson $BV$ and Cousins $R$ photometric passbands are determined for the optical transient of GRB 990123. These observations have been taken approximately 12 hours after trigger of the gamma-ray ...

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