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  • Oppositions of Mars in 1954 and 1956 
    Das, A. K (Government Observatory, Madras, 1958-07)
  • Optical / IR Follow-up of ISOGAL survey 
    Ojha, D. K; Omont, A; Simon, G. (Astronomical Society of India, 1998)
  • The optical afterglow of the not so dark GRB 021211 
    Pandey, S. B; Anupama, G. C; Sagar, R; Bhattacharya, D; Castro-Tirado, A. J; Sahu, D. K; Parihar, P. S; Prabhu, T. P (The European Southern Observatory, 2003-09)
    We determine Johnson B,V and Cousins R,I photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been probably missed if no prompt ...
  • Optical and GeV flux variations in Fermi blazars 
    Stalin, C. S (Astronomical Society of India, 2015-04)
    A large fraction of γ-ray emitting blazars show correlated flux variations in the optical and γ-ray bands with little or no time lag. However, in a minority of them, uncorrelated optical and γ-ray flux variations are seen. ...
  • Optical and near-infrared photometric study of the open cluster NGC 637 and 957 
    Yadav, R. K. S; Kumar, B; Subramaniam, A; Sagar, R; Mathew, B (Royal Astronomical Society, 2008-11)
    We present UBVRI CCD photometry in the region of the open clusters NGC 637 and 957. The radii are found to be 4.2 and 4.3 arcmin. Their reddenings E(B - V) are 0.64 +/- 0.05 and 0.71 +/- 0.05 mag and their distances, from ...
  • Optical and near-infrared spectroscopy of nova V1494 Aquilae 1999 no. 2 
    Kamath, U. S; Anupama, G. C; Ashok, N. M; Mayya, Y. D; Sahu, D. K (Monthly Notices of the Royal Astronomical Society, Vol. 361, No. 4, pp. 1165 - 1172, 2005-08)
    Optical and near-infrared spectroscopic observations of the fast nova V1494 Aquilae 1999 no. 2 covering various phases - early decline, transition and nebular - during the first 18 months of its post-outburst evolution are ...
  • Optical and Near-infrared Study of Nova V2676 Oph 2012 
    Raj, A; Das, R. K; Walter, F. M (IOP Publishing, 2017-02-01)
    We present optical spectrophotometric and near-infrared (NIR) photometric observations of the nova V2676 Oph covering the period from 2012 March 29 through 2015 May 8. The optical spectra and photometry of the nova have ...
  • Optical and near-infrared survey of the stellar contents associated with the star-forming complex Sh2-252 
    Jose, J; Pandey, A. K; Ogura, K; Samal, M. R; Ojha, D. K; Bhatt, B. C; Chauhan, N; Eswaraiah, C; Mito, H; Kobayashi, N; Yadav, R. K (Wiley-Blackwell, 2012-08)
    We present the analyses of the stellar contents associated with the extended H ii region Sh2-252 using deep optical UBVRI photometry, slit and slitless spectroscopy along with the near-infrared (NIR) data from Two-Micron ...
  • 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 NIR observations of the nearby type Ia supernova SN 2014J 
    Srivastav, S; Ninan, J. P; Kumar, B; Anupama, G. C; Sahu, D. K; Ojha, D. K; Prabhu, T. P (Oxford University Press on behalf of the Royal Astronomical Society, 2016-03)
    Optical and NIR observations of the Type Ia supernova SN 2014J in M82 are presented. The observed light curves are found to be similar to normal Type Ia supernovae (SNe Ia), with a decline rate parameter m 15 ( B ...
  • Optical and NIR spectroscopy of cool CEMP stars to probe the nucleosynthesis in low-mass AGB binary system 
    Susmitha, A; Ojha, D. K; Sivarani, T; Ninan, J. P; Bandyopadhyay, A; Surya, Arun; Unni, Athira (Oxford University Press on behalf of Royal Astronomical Society, 2021-09)
    We present the abundance analyses of seven carbon enhanced metal-poor (CEMP) stars to understand the origin of carbon in them. We used high-resolution optical spectra to derive abundances of various elements. We also used ...
  • Optical and physical properties of aerosols during active fire events occurring in the Indo-Gangetic Plains: Implications for aerosol radiative forcing 
    Shantikumar, N. S; Dumka, U. C; Srivastava, A. K; Song, H. -J (Elsevier B. V, 2020-02-15)
    The climatological characteristics of biomass burning over the western Indo-Gangetic Plain (IGP) are examined during the post-monsoon (October-November) season from 2001-2018 using the Moderate resolution Imaging Spectrometer ...
  • 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 and radio variability of the BL Lacertae object AO 0235+16: A possible 5-6 year periodicity 
    Raiteri, C. M; Villata, M; Aller, H. D; Aller, M. F; Heidt, J; Kurtanidze, O. M; Lanteri, L; Maesano, M; Massaro, E; Montagni, F; Nesci, R.; Nilsson, K; Nikolashvili, M. G; Nurmi, P; Ostorero, L; Pursimo, T; Rekola, R; Sillanpää, A; Takalo, L. O; Teräsranta, H; Tosti, G; Balonek, T. J; Feldt, M; Heines, A; Heisler, C; Hu, J.; Kidger, M; Mattox, J. R; McGrath, E. J; Pati, A. K; Robb, R; Sadun, A. C; Shastri, P; Wagner, S. J; Wei, J; Wu, X (E D P Sciences, 2001-10)
    The BL Lacertae object AO 0235+16 is well known for its extreme optical and radio variability. New optical and radio data have been collected in the last four years by a wide international collaboration, which confirm the ...
  • Optical and UV studies of type Ia supernovae SN 2009ig and SN 2012cg 
    Chakradhari, N. K; Sahu, D. K; Anupama, G. C (Oxford University Press on behalf of the Royal Astronomical Society, 2019-08)
    We present an extensive optical–ultraviolet photometry and analysis of a series of optical spectra of type Ia supernovae SN 2009ig and SN 2012cg. The observations range from −15 to +185 d for SN 2009ig and from −14 to 316 ...
  • Optical and x-ray observations of M31N 2007-12b: an extragalactic recurrent nova with a detected progenitor? 
    Bode, M. F; Darnley, M. J; Shafter, A. W; Page, K. L; Smirnova, O; Anupama, G. C; Hilton, T (The American Astronomical Society, 2009-11)
    We report combined optical and X-ray observations of nova M31N 2007-12b. Optical spectroscopy obtained 5 days after the 2007 December outburst shows evidence of very high ejection velocities (FWHM Hα sime 4500 km s-1). In ...
  • Optical and X-ray studies of three polars: RX J0859.1 + 0537, RX J0749.1–0549, and RX J0649.8–0737 
    Joshi, Arti; Pandey, J. C; Singh, K. P; Anupama, G. C; Singh, H. P (Oxford University Press on behalf of the Royal Astronomical Society, 2020-01)
    We present optical photometric and spectroscopic observations, and an analysis of archival X-ray data of three polars: RX J0859.1+0537, RX J0749.1–0549, and RX J0649.8–0737. Optical light curves of these three polars reveal ...
  • Optical Aspects of Solar Activity 
    Bhatnagar, A (Indian Institute of Astrophysics, Bangalore, 1986)
    A review of optical observations of some solar phenomena is presented. From the photospheric observations of the birth, growth and decay of pores, spots and sunspot groups and associated velocity and magnetic field structure ...
  • Optical Astronomy in India - prospects of the next decade 
    Bappu, M. K. V (Indian Academy of Sciences, 1972-12)
  • Optical astronomy in India - prospects of the next decade 
    Bappu, M. K. V (Indian Academy of Sciences, 1972-12)

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