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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • CCD time-series photometry of variable stars in globular clusters and the metallicity dependence of the horizontal branch luminosity 
    Arellano Ferro, A; Bramich, D. M; Giridhar, S (Institute de Astronomia, 2017-04)
    We describe and summarize the findings from our CCD time-seri es photom- etry of globular clusters (GCs) program and the use of differe nce image analysis (DIA) in the extraction of precise light curves down to V ≈ 19 ...
  • A CCD-based polarization interferometric technique for testing waveplates 
    Sankarasubramanian, K; Venkatakrishnan, P (Elsevier Science Ltd, 1998-02)
    A CCD-based polarization interferometric technique is developed to test waveplates. A Babinet compensator is used to produce interference fringes for polarized input and the retardance introduced by the waveplate when ...
  • CD-HPF: new habitability score via data analytic modeling 
    Bora, K; Saha, S; Agrawal, S; Safonova, M; Routh, S; Narasimhamurthy, A (Elsevier B.V, 2016-10)
    The search for life on the planets outside the Solar System can be broadly classified into the following: looking for Earth-like conditions or the planets similar to the Earth (Earth similarity), and looking for the ...
  • CEESA meets machine learning: a Constant Elasticity Earth Similarity Approach to habitability and classification of exoplanets 
    Basak, S; Saha, S; Mathur, S; Bora, K; Makhija, S; Safonova, M; Agarwal, S (Elsevier B.V, 2020-01)
    We examine the existing metrics of habitability and classification schemes of extrasolar planets and provide an exposition of the use of computational intelligence techniques to estimate habitability and to automate the ...
  • Celebrating supernovae that changed the world 
    Vishwanath, P. R (Nature Publishing Group, 2004-02-12)
  • A census of young stellar population associated with the Herbig Be star HD 200775 
    Saha, Piyali; Maheswar, G; Kamath, U. S; Lee, C. W; Puravankara, Manoj; Mathew, B; Sharma, Ekta (Oxford University Press on behalf of the Royal Astronomical Society, 2020-06)
    The region surrounding the well-known reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, located in the dark cloud L1174 is studied in this work. Based on the distances and proper motion values from ...
  • Center-to-limb Observations and Modeling of the Ca I 4227 Å Line 
    Supriya, H. D; Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Ramelli, R; Ravindra, B; Anusha, L. S (IOP Publishing, 2014-09-20)
    The observed center-to-limb variation (CLV) of the scattering polarization in different lines of the Second Solar Spectrum can be used to constrain the height variation of various atmospheric parameters, in particular the ...
  • A central gravitational redshift model for the absorption redshift systems in quasi-stellar objects 
    Das, P. K (Royal Astronomical Society, 1979-01)
    Static, spherically symmetric configurations of core and envelope type have been considered in General Relativity as central gravitational redshift models for the quasi-stellar objects (QSOs) and an attempt has been made ...
  • The central region of the enigmatic Malin 1 
    Saha, Kanak; Dhiwar, Suraj; Barway, Sudhanshu; Narayan, Chaitra; Tandon, Shyam (Indian Academy of Sciences, 2021-10)
    Malin 1, being a class of giant low surface galaxies, continues to surprise us even today. The HST/F814W observation has shown that the central region of Malin 1 is more like a normal SB0/a galaxy, while the rest of the ...
  • Central regions of Sersic-Pastoriza galaxies - A photographic study 
    Prabhu, T. P (Indian Academy of Sciences, 1980-12)
    A classification scheme is proposed for the central regions of Sérsic-Pastoriza galaxies based on high resolution photographs of 50 objects in the integrated light (4000 Å-8700 Å). Structures of two different linear scales ...
  • The Central Velocity Field in NGC 253: Possible Indication of a Bar 
    Das, M; Anantharamaiah, K. R; Yun, M. S (The American Astronomical Society, 2001-03)
    We have investigated whether motion of gas in a barlike potential can account for the peculiar but systematic velocity field observed in the nuclear region of the starburst galaxy NGC 253. This unusual velocity field with ...
  • Centre-limb variation of solar excitation temperature as derived from Ti I lines 
    Sankaranarayanan, S (Government Observatory, Madras, 1957-12)
  • Centrifugal Acceleration in Pulsar Magnetospheres 
    Thomas, R. M. C; Gangadhara, R. T (International Astronomical Union, 2004)
    We present a relativistic model of pulsar radio emission by plasma accelerated along the rotating magnetic field lines projected on to a 2D plane perpendicular to the rotation axis. We have derived the expression for the ...
  • Centrifugal acceleration of plasma in pulsar magnetosphere 
    Gangadhara, R. T; Krishan, V (Indian Academy of Sciences, 2003-12)
    We present a relativistic model for the centrifugal acceleration of plasma bunches and the coherent radio emission in pulsar magnetosphere. We find that rotation broadens the width of leading component compared to the width ...
  • Centroid detection by Gaussian pattern matching in adaptive optics 
    Vyas, A; Roopashree, M. B; Prasad, B. R (Foundation of Computer Science, 2010)
    Shack Hartmann wavefront sensor is a two dimensional array of lenslets which is used to detect the incoming phase distorted wavefront through local tilt measurements made by recording the spot pattern near the focal plane. ...
  • Century long study of sunspot activity using the Kodaikanal white-light data 
    Amareswari, K; Sankarasubramanian, K; Ravindra, B (Cambridge University Press, 2018-02)
    Sunspots are the most obvious and high contrast observable feature of solar magnetic activity in the photosphere. The morphological and kinematic behaviour of sunspots on the solar surface need to be studied over a long ...
  • A century of solar Ca ii measurements and their implication for solar UV driving of climate 
    Foukal, P; Bertello, L; Livingston, W. C; Pevtsov, A. A; Singh, J; Tlatov, A. G; Ulrich, R. K (Springer, 2009-04)
    Spectroheliograms and disk-integrated flux monitoring in the strong resonance line of Ca ii (K line) provide the longest record of chromospheric magnetic plages. We compare recent reductions of the Ca ii K spectroheliograms ...
  • Cerenkov radiation emitted by charged particles in a gravitational field 
    Gupta, A; Mohanty, S; Samal, M. K (Institute of Physics, 1999-01)
    Charged particles propagating in an external gravitational field with negative Ricci tensor components can emit radiation by the Cerenkov process. The external gravitational field acts like an effective refractive index ...
  • The CH fraction of carbon stars at high galactic latitudes 
    Goswami, A; Drisya, K; Shantikumar, N. S (Blackwell Publishing, 2010-02)
    CH stars form a distinct class of objects with characteristic properties like iron deficiency, enrichment of carbon and overabundance of heavy elements. These properties can provide strong observational constraints for the ...
  • CH stars at high Galactic latitudes 
    Goswami, A (Blackwell Publishing, 2005-05)
    Carbon-rich stars of Population II, such as CH stars, can provide direct information on the role of low- to intermediate-mass stars of the halo in early Galactic evolution. Thus accurate knowledge of the CH stellar population ...

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