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Browsing by Author "Mohan, V"

Browsing by Author "Mohan, V"

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  • BVRI CCD photometric standards in the field of GRB 990123 
    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 ...
  • CCD photometry of galactic open star clusters - V. King 7 
    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 ...
  • CCD photometry of galactic open star clusters -- 2: NGC 7419 
    Bhatt, B. C; Pandey, A. K; Mohan, V; Mahra, H. S; Paliwal, D. C (Astronomical Society of India, 1993-03)
    CCD photometric observations of open cluster NGC 7419 in UBVRI passbands have been made down to V = 19.5 mag. Reddening across the cluster region is found to be variable. The mean visual absorption of 5.30 mag and a distance ...
  • CCD photometry of galactic open star clusters IV. NGC 366 
    Pandey, A. K; Bhatt, B. C; Mohan, V; Paliwal, D. C; Mahra, H. S (Astronomical Society of India, 1994)
  • CCD photometry of the galactic open cluster NGC 2309 
    Nilakshi, P; Anil, K; Mohan, V (Astronomical Society of India, 1998)
  • CCD photometry of the galactic open star clusters. I - King 10 
    Mohan, V; Pandey, A. K; Paliwal, D. C; Sagar, R; Mahra, H. S (Astronomical Society of India, 1992)
    CCD photometry of the open cluster King 10 has been carried out in the UBVRI photometric passbands down to V of about 19.5 mag. The reddening for the cluster region is found to be variable. A distance of 3.2 kpc has been ...
  • CCD photometry of the galactic star clusters Be 15, Be 71 and King 1 
    Lata, S; Mohan, V; Sagar, R (Astronomical Society of India, 2004-12)
    We present UBV RI CCD photometry of three open star clusters Be 15, Be 71 and King 1 for the fist time. Base on these data, optical colour magnitude diagrams (CMDs) for the stars in the clusters down to V = 22 mag are ...
  • CCD Photometry of the Open Cluster BE 69 
    Pandey, A. K; Durgapal, A. K; Bhatt, B. C; Mohan, V; Mahra, H. S (International Astronomical Union, 1996)
    The morphological features of CMDs of Be 69 are better understood in terms of convective overshooting.The Comparison of CMDs with the convective overshoot models (Bertelli et al. 1994)produces a good fit for metallicity ...
  • CCD photometry of the open cluster King 5 
    Durgapal, A. K; Pandey, A. K; Mohan, V (Astronomical Society of India, 1998)
  • CCD photometry of the unstudied galactic star clusters Be 10, Be 67 and To 5 
    Lata, S; Mohan, V; Pandey, A. K; Sagar, R (Astronomical Society of India, 2004-03)
    We present the broad band Johnson U BV and Cousins RI CCD photometric observations for open clusters Be 10, Be 67 and To 5. So far no photometric study of these clusters is published. The colour-magnitude diagrams indicate ...
  • A deep V I CCD photometric study of the neglected galactic star cluster NGC 6631 
    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 ...
  • Field star contamination in open star cluster NGC 2301 
    Mohan, V; Sagar, R (Astronomical Society of Indian, 1988-12)
    Photographic photometry of about 900 stars down to V = 17 mag has been carried out in the region of the open cluster NGC 2301. The cluster region seems to be severely contaminated by field stars. Statistical criteria yield ...
  • GRB 000301C with peculiar afterglow emission 
    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 ...
  • GRB 000926 and its optical afterglow : Another possible evidence for non-isotropic emission 
    Sagar, R; Pandey, S. B; Mohan, V; Bhattacharya, D; Castro-Tirado, A. J (Astronomical Society of India, 2001)
    The CCD Johnson BV and Cousins RI photomertric magnitudes are determined for 20 stars in the field of GRB 000926. They are used to calibrate the present R as well as published BVRI photometric magnitudes of the GRB 000926 ...
  • Integrated photometric characteristics of galactic open star clusters 
    Lata, S; Pandey, A. K; Sagar, R; Mohan, V (E D P Sciences, 2002-06)
    Integrated UBVRI photometric parameters of 140 galactic open clusters have been computed. Integrated I(V-R)0 and I(V-I)0 colours as well as integrated parameters for 71 star clusters have been obtained for the first time. ...
  • Low resolution spectroscopy of selected Algol systems 
    Shanti Priya Devarapalli; Rukmini Jagirdar; Parthasarathy, M; Sahu, D. K; Mohan, V; Bhatt, B. C; Thomas, V. S (Springer, 2018-04)
    The analysis of spectroscopic data for 30 Algol-type binaries is presented. All these systems are short period Algols having primaries with spectral types B and A. Dominant spectral lines were identified for the spectra ...
  • Multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 
    Sagar, R; Gopal-Krishna; Mohan, V; Pandey, A. K; Bhatt, B. C; Wagner, S. J (The European Southern Observatory, 1999-02)
    We report multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 with a dense temporal coverage over a total duration of 4 weeks in February/March 1994. Four filters (BV Johnson and RI Cousins) were ...
  • The Occulatation of Hyd - 20/sup0/51695 by Uranus on 1982 May 1 
    Pandey, A. K; Mahra, H. S; Mohan, V (Astronomical Society of India, 1984-09)
  • 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 ...
  • 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 ...

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