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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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  • Open Star Clusters: Star Formation and Structure 
    Pandey, A. K (Astronomical Society of India, 2003)
    Observational evidences indicate that the formation of open star clusters has been efficient throughout the life of our Galaxy. As a consequence, we find open clusters with ages ranging from a few Myr to few Gyr. This makes ...
  • Optical / IR Follow-up of ISOGAL survey 
    Ojha, D. K; Omont, A; Simon, G. (Astronomical Society of India, 1998)
  • Optical and near-IR imaging of dusty ellipticals 
    Pandey, S. K; Sahu, D. K; Kembhavi, A. K; McCarthy, P. J (Astronomical Society of India, 2001)
    In this paper we present some of the results of imaging observations of dusty ellipticals in the optical B & R bands as well as in near IR K'-band taken at the Las Campanas Observatory, Chile. We derive radial profiles of ...
  • Optical and radio observations of the bright GRB 010222 afterglow: evidence for rapid synchrotron cooling ? 
    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 ...
  • Optical colours and polarization of a model reflection nebula IV. Mixture of grains in the case of the star within the nebula 
    Shah, G. A (Astronomical Society of India, 1981-12)
    The UBV colour differences and polarization that can be caused by mixtures of interstellar grains in a model reflection nebula have been presented. The geometrical configuration of the nebula is adapted in the form of a ...
  • Optical counter-parts of Gamma Ray Bursts 
    Bhat, P. N (Astronomical Society of India, 2000)
    Gamma Ray Bursts (GRB'S) being the most energetic astronomical phenomena known to date still pose a formidable challenge to astronomers. The BATSE on board the Compton Observatory (CGRO) launched in 1991, has shown that ...
  • Optical depth towards the nucleus of Halley's comet 
    Shah, G. A (Astronomical Society of Indian, 1989-09)
    A new relation between the nuclear radius and the optical depth toward the nucleus of Comet Halley has been derived on the basis of the radial variation of the effective area of the grains along the Giotto trajectory in ...
  • Optical design of a focal reducer 
    Prasad, C. D (Astronomical Society of India, 1994)
  • Optical follow up of the GRB 990123 sources from UPSO, Naini Tal 
    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 ...
  • Optical follow-up of GRB afterglows from UPSO, Naini Tal 
    Pandey, S. B; Sagar, R; Mohan, V; Pandey, A. K; Bhattacharya, D; Castro-Tirado, A. J (Astronomical Society of India, 2001)
    Successful optical photometric observations of five GRB afterglows namely GRB 990123, GRB 991208, GRB 991216, GRB 000301c and GRB 000926 have been carried out from State Observatory Naini Tal till 2000. The results and ...
  • Optical identification and BVRI photometry of a few 'unidentified' IRAS sources of a late type stellar nature 
    Iyengar, K. V. K (Astronomical Society of India, 1993)
    A search for the optical counterparts of 21 'unidentified' IRAS sources was carried out using the Palomar Observatory Sky Survey (POSS), European Space Observatory (ESO) and Space Engineering Research Center (SERC) Sky ...
  • Optical identification of equatorial infrared catalogue number 1 sources previously identified with only AFGL sources 
    Iyengar, K. V. K; Tandon, S. N; Verma, R. P (Astronomical Society of India, 1983-09)
    We have identified, using Palomar Observatory Sky Survey (POSS) prints, the optical counterparts of six of the seven sources from the Equatorial Infrared Catalogue Number 1 (EIC-1) previously identified by Sweeney et al. ...
  • Optical observations and multiband modelling of the afterglow of GRB041006 : Evidence of a hard electron energy spectrum 
    Misra, K; Resmi, L; Pandey, S. B; Bhattacharya, D; Sagar, R (Astronomical Society of India, 2005-12)
    We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a p1 ~ 1.3. The burst appears ...
  • Optical Observations of a Lunar Meteor Event during Leonid Meteor Showers in 2001 
    Chandrasekhar, T; Kikani, P. K; Mathur, S. N (Astronomical Society of India, 2003)
    We report a probable transient lunar meteor event observed during careful video recording of the unlit portion of the moon during the Leonid shower activity on 18th November 2001. A video CCD was attached to the 1.2m ...
  • Optical Observations of Geostationary Satellites 
    Dixit, P. S; Rao, P. K (Astronomical Society of India, 1978-12)
    A survey of celestial equator that is observable from Kavalur was made using satellite tracking camera AFU-75, to locate the positions of geostationary satellites that are accessible within the capabilities of camera from ...
  • Optical observations of GRB afterglows from India 
    Sagar, R; Misra, K (Astronomical Society of India, 2005-06)
    Optical observations of GRB afterglows provide information about GRB distances as well as their isotropic/non-isotropic nature of emission. More than 30 GRB fields have been probed by us during 1999 to 2003, out of which ...
  • Optical observations of the bright long duration peculiar GRB 021004 afterglow. 
    Pandey, S. B; Sahu, D. K; Resmi, L; Sagar, R; Anupama, G. C; Bhattacharya, D; Mohan, V; Prabhu, T. P; Bhatt, B. C; Pandey, J. C; Parihar, P. S; Castro-Tirado, A. J (Astronomical Society of India, 2003)
    The CCD magnitudes in Johnson B,V and Cousins R and I photometric passbands are determined for the bright long duration GRB 021004 afterglow from 2002 October 4 to 16 starting ~ 3 hours after the γ - ray burst. Light curves ...
  • Optical photometry of the GRB 010222 afterglow 
    Cowsik, R; Prabhu, T. P; Anupama, G. C; Bhatt, B. C; Sahu, D. K; Ambika, S; Padmakar; Bhargavi, S. G (Astronomical Society of India, 2001)
    The optical afterglow of GRB 010222 was observed using the recently installed 2-m telescope at the Indian Astronomical Observatory, Hanle, and the telescopes at the Vainu Bappu Observatory, Kavalur, beginning ~ 0.6 day ...
  • Optical spectroscopy of nova V1494 Aquilae 1999 
    Anupama, G. C; Sahu, D. K; Mayya, Y. D (Astronomical Society of India, 2001)
  • Optical spectroscopy of SN1998S 
    Anupama, G. C; Pandey, G; Sivarani, T (Astronomical Society of India, 2000)

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