IIAP Publications: Recent submissions

  • Optical photometry and basic parameters of 10 unstudied open clusters 
    Subramaniam, A; Carraro, G; Janes, K. A (Blackwell Publishing, 2010-05)
    We present BVI CCD photometry of 10 northern open clusters, Berkeley43, Berkeley45, Berkeley47, NGC 6846, Berkeley49, Berkeley51, Berkeley89, Berkeley91, Tombaugh4 and Berkeley9, and estimate their fundamental parameters. ...
  • Observed polarization of brown dwarfs suggests low surface gravity 
    Sengupta, S; Marley, M. S (IOP Publishing, 2010-10-20)
    Light scattering by atmospheric dust particles is responsible for the polarization observed in some L dwarfs. Whether this polarization arises from an inhomogeneous distribution of dust across the disk or an oblate shape ...
  • The Hanle effect as diagnostic tool for turbulent magnetic fields 
    Anusha, L. S; Sampoorna, M; Frisch, H; Nagendra, K. N (Springer, 2010)
    The Hanle effect is calculated for a random magnetic field characterized by a finite correlation length and a probability density function of the magnetic field vector. It is shown that linear polarization is essentially ...
  • Bright points in G-Band and Ca IIH images from hinode 
    Pradeep Chitta, L; Kariyappa, R (Springer, 2010)
    We analyze a time sequence simultaneous G-band and Ca IIH images taken with Hinode/SOT on 14 April 2007 during 17:00-18:00UT. In each sequence, we selected 20 bright points and derived their light curves. Power-spectrum ...
  • Probability density functions to represent magnetic fields at the solar surface 
    Sampoorna, M (Springer, 2010)
    Numerical simulations of magneto-convection and analysis of solar magnetogram data provide empirical probability density functions (PDFs) for the line-of-sight component of the magnetic field. In this paper, we theoretically ...
  • Dynamical evolution of x-ray bright points with hinode/XRT 
    Kariyappa, R; Varghese, B. A; DeLuca, E. E; van Ballegooijen, A. A (Springer, 2010)
    We analyzed a 7-h long time sequence of soft X-ray images obtained on 14 April 2007 from a quiet region using the X-Ray Telescope (XRT) onboard Hinode. The aim was to observe intensity oscillations in coronal XBPs of ...
  • Statistical detection of propagating waves in a polar coronal hole 
    Gupta, G. R; O'Shea, E; Banerjee, D; Popescu, M; Doyle, J. G (Springer, 2010)
    Waves are important in the heating of the solar corona and the acceleration of the solar wind. We have examined a long spectral time series sampling a southern coronal hole, observed on the 25 February 1997 using the SUMER ...
  • Solar physics at the Kodaikanal observatory: a historical perspective 
    Hasan, S. S; Mallik, D. C. V; Bagare, S. P; Rajaguru, S. P (Springer, 2010)
    The Kodaikanal Observatory traces its origins to the East India Company, which started an observatory in Madras “for promoting the knowledge of astronomy, geography, and navigation in India.” Observations began in 1787 at ...
  • Searching for IMBHs in globular clusters 
    Safonova, M (World Scientific and Engineering Academy and Society, 2010)
    Globular clusters have been alternatively predicted to host intermediate-mass black holes (IMBFIs) or nearly impossible to form and retain them in their centres. Over the last decade enough theoretical and observational ...
  • Studies on m-benzyne and phenol via improved virtual orbital-complete active space configuration interaction (IVO-CASCI) analytical gradient method 
    Chattopadhyay, S; Chaudhuri, R. K; Mahapatra, U. S (Elsevier, 2010-05)
    Improved virtual orbital-complete active space configuration interaction (IVO-CASCI) analytical gradient theory has been used to investigate geometrical parameters, vibrational frequencies and excitation energies of m-benzyne ...
  • Search for TeV gamma-rays from Geminga pulsar 
    Singh, B. B; Chitnis, V. R; Bose, D; Rahman, M. A; Upadhya, S. S; Gothe, K. S; Nagesh, B. K; Purohit, P. N; Rao, S. K; Rao, K. K; Sharma, S. K; Sudersan, P. V; Venkateshmurthy, B. L; Vishwanath, P. R; Acharya, B. S (Elsevier, 2009-09)
    We present the results of observation of the Geminga pulsar carried out in the TeV energy band during the 6 year period spanning 2000–2006 using the Pachmarhi Array of Cherenkov Telescopes (PACT). A long stretch of data, ...
  • GPS-derived deformation rates in northwestern Himalaya and Ladakh 
    Jade, S; Raghavendra Rao, H. J; Vijayan, M. S. M; Gaur, V. K; Bhatt, B. C; Kumar, K; Jaganathan, S; Ananda, M. B; Dileep Kumar, P (Springer, 2011-09)
    Deformation rates derived from GPS measurements made at two continuously operating stations at Leh (34.1°N, 77.6°E) and Hanle (32.7°N, 78.9°E), and eight campaign sites in the trans-Himalayan Ladakh spanning 11 years ...
  • RACE-OC project: rotation and variability in the open cluster M 11 (NGC 6705) 
    Messina, S; Parihar, P. S; Koo, J. R; Kim, S. L; Rey, S. C; Lee, C. U (EDP Sciences, 2010-04)
    Rotation and magnetic activity are intimately linked in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on stellar rotation, and rotation itself is strongly influenced ...
  • Indian Institute of Astrophysics. Report for the year 1973 April 1 to 1974 March 31 
    Bappu, M. K. V (Royal Astronomical Society, 1975-06)
  • Hall-magnetohydrodynamic turbulence 
    Krishan, V; Mahajan, S. M (Anita Publications, 2005)
  • HD209621: abundances of neutron-capture elements 
    Goswami, A; Aoki, W (Blackwell Publishing, 2010-05)
    High-resolution spectra obtained from the Subaru Telescope High Dispersion Spectrograph have been used to update the stellar atmospheric parameters and metallicity of the star HD 209621. We have derived a metallicity of ...
  • A multiwavelength study of star formation in the vicinity of galactic H II region Sh 2-100 
    Samal, M. R; Pandey, A. K; Ojha, D. K; Ghosh, S. K; Kulkarni, V. K; Kusakabe, N; Tamura, M; Bhatt, B. C; Thompson, M. A; Sagar, R (The American Astronomical Society, 2010-05)
    We present multiwavelength investigation of morphology, physical-environment, stellar contents, and star formation activity in the vicinity of star-forming region Sh 2-100. It is found that the Sh 2-100 region contains ...
  • Three-component dust models for interstellar extinction 
    Muthumariappan, C (Springer, 2010-03)
    Interstellar extinction curves obtained from the ‘extinction without standard’ method were used to constrain the dust characteristics in the mean ISM (RV = 3.1), along the lines of sight through a high latitude diffuse ...
  • The astronomical significance of megalithic stone alignments at Vibhuthihalli in Northern Karnataka 
    Kameswara Rao, N; Thakur, Priya (Centre for Astronomy, James Cook University, 2010-03)
    A megalithic site at Vihuthihalli in Karnataka, India, contains alignments of stones that are arranged in a square pattern with rows and columns showing a diagonal arrangement. Such structures are non-sepulchral, and ...
  • Oxygen isotopic ratios in cool R coronae borealis stars 
    Garcia-Hernandez, D. A; Lambert, D. L; Kameswara Rao, N; Hinkle, K. H; Eriksson, K (Institute of Physics, 2010-05)
    We investigate the relationship between R Coronae Borealis (RCB) stars and hydrogen-deficient carbon (HdC) stars by measuring precise 16O/18O ratios for five cool RCB stars. The 16O/18O ratios are derived by spectrum ...

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