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  • Open Access Week 2012 @ Indian Institute of Astrophysics 
    Library, IIA (Library, Indian Institute of Astrophysics, 2012-10-22)
    Open Access (OA) literature is digital, online, free of charge, and free of most copyright and licensing restrictions. What makes it possible is the internet and the consent of the author or copyright-holder
  • Open Access Week 2013 @ Indian Institute of Astrophysics 
    Library, IIA (Library, Indian Institute of Astrophysics, 2013-10-23)
    Historical scientific contents accessible from Open Access Repositories facilitate interactive communication in addition to their value for research publications.
  • Open and closed magnetic configurations of twisted flux tubes 
    Sen, Samrat; Mangalam, A (IOP Publishing, 2019-06-01)
    We construct two classes of magnetohydrostatic (MHS) equilibria for an axisymmetric vertical flux tube spanning from the photosphere to the lower part of the transition region within a realistic stratified solar atmosphere ...
  • 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 ...
  • An operator perturbation method for polarized line transfer - VI. Generalized PALI method for Hanle effect with partial frequency redistribution and collisions 
    Fluri, D. M; Nagendra, K. N; Frisch, H (EDP Sciences, 2003)
    A generalized iteration method is presented to solve the polarized line transfer equation for a two-level-atom in an arbitrarily oriented, weak magnetic field. The polarized redistribution matrix employed accounts ...
  • An operator perturbation method for polarized line transfer. I. Non-magnetic regime in 1D media. 
    Faurobert-Scholl, M; Frisch, H; Nagendra, K. N (European Southern Observatory, 1997-06)
    In this paper we generalize an Approximate Lambda Iteration (ALI) technique developed for scalar transfer problems to a vectorial transfer problem for polarized radiation. Scalar ALI techniques are based on a suitable ...
  • An operator perturbation method for polarized line transfer. III. Applications to the Hanle effect in 1D media 
    Nagendra, K. N; Frisch, H; Faurobert-Scholl, M (European Southern Observatory, 1998-04)
    In this paper we present an Approximate Lambda Iteration method to treat the Hanle effect (resonance scattering in the presence of a weak magnetic field) for lines formed with complete frequency redistribution. The Hanle ...
  • An operator perturbation method for polarized line transfer: IV. Applications to the Hanle effect with partial frequency redistribution 
    Nagendra, K. N; Paletou, F; Frisch, H; Faurobert-Scholl, M (Kluwer Academic Publishers, 1999)
  • An Operator Perturbation Method of Polarized Line Transfer V. Diagnosis of Solar Weak Magnetic Fields 
    Nagendra, K. N; Frisch, H; Faurobeet-Scholl, M; Paletou, F (Indian Academy of Sciences, 2000-12)
    We present an application of the PALI (Polarized Approximate Lambda Iteration) method to the resonance scattering in spectral lines formed in the presence of weak magnetic fields. The method is based on an operator ...
  • Opportunities for astrophysical science from the inner and outer solar system 
    Zemcov, Michael; Arcavi, Iair; Arendt, Richard G; Bachelet, Etienne; Beichman, Chas; Bock, James; Brandt, Pontus; Ranga Ram Chary; Cooray, Asantha; Dragomir, Diana; Gorjian, Varoujan; Harman, Chester E; Henry, Richard Conn; Lisse, Carey; Lubin, Philip; Matsuura, Shuji; McNutt, Ralph; Murthy, J; Poppe, Andrew R; Paul, Michael V; Reach, William T; Shvartzvald, Yossi; Street, R A; Symons, Teresa; Werner, Michael (American Astronomical Society, 2019-05)
    Astrophysical measurements away from the 1 AU orbit of Earth can enable several astrophysical science cases that are challenging or impossible to perform from Earthbound platforms, including: building a detailed understanding ...
  • 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 ...

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