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Browsing by Subject "polarization"

Browsing by Subject "polarization"

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  • ARIES imaging polarimeter 
    Rautela, B. S; Joshi, G. C; Pandey, J. C (Astronomical Society of India, 2004-09)
    An Imaging Polarimeter has been fabricated for use with liquid- N2 cooled CCD camera and is designed to suit 104-cm Sampurnanand telescope with an f/13 focus at Aryabhatta Research Institute of Observational Sciences ...
  • 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 ...
  • Distance, magnetic field, and kinematics of the filamentary cloud LDN 1157 
    Sharma, Ekta; Maheswar, G; Archana Soam; Lee, Chang Won; Kim, Shinyoung; Ghosh, Tuhin; Anandmayee Tej; Kim, Gwanjeong; Sharma, Neha; Saha, Piyali (EDP Sciences, 2020-07)
    Context. LDN 1157 is one of several clouds that are situated in the cloud complex LDN 1147/1158. The cloud presents a coma-shaped morphology with a well-collimated bipolar outflow emanating from a Class 0 protostar, LDN ...
  • Effects of angle-dependent partial frequency redistrubtion on polarized line profiles 
    Sampoorna, M; Nagendra, K. N; Frisch, H; Stenflo, J. O (Astronomical Society of the Pacific, 2019-07)
    Scattering of solar limb darkened radiation field on atoms and molecules produces linearly polarized spectrum of the sun (Second Solar Spectrum). Partial frequency redistribution (PFR) plays a fundamental role in shaping ...
  • Non-conservative Rayleigh scattering in a finite atmosphere - II. Polarization in telluric lines 
    Mohan Rao, D; Rangarajan, K. E; Abhyankar, K. D (Astronomical Society of India, 1995)
    We consider non-conservative Rayleigh scattering in finite atmospheres and study the polarization in the molecular lines both in the transmitted and reflected sunlight. We first investigate the parameterized models to ...
  • Optical colours and polarization of a model reflection nebula IV. Mixture of grains in the case of the star within the nebula 
    Shah, G. A (Astronomical Society of India, 1981-12)
    The UBV colour differences and polarization that can be caused by mixtures of interstellar grains in a model reflection nebula have been presented. The geometrical configuration of the nebula is adapted in the form of a ...
  • Polarized Line Formation in Arbitrary Strength Magnetic Fields: The Case of a Two-level Atom with Hyperfine Structure Splitting 
    Sampoorna, M; Nagendra, K. N; Sowmya, K; Stenflo, J. O; Anusha, L. S (IOP Publishing, 2019-10-01)
    Quantum interference effects, together with partial frequency redistribution (PFR) in line scattering, produce subtle signatures in the so-called Second Solar Spectrum (the linearly polarized spectrum of the Sun). These ...
  • Polarized line formation in spherically symmetric expanding atmospheres 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (Astronomical Society of the Pacific, 2019-07)
    We consider the problem of polarized line formation in the spherically symmetric expanding atmospheres. The velocity fields in line forming regions produce Doppler shift, aberration of photons and also gives rise to ...
  • Radio emission from pulsars due to relativistic plasma 
    Roy, Tridib; Gangadhara, R. T. (IOP Publishing, 2019-07)
    Pulsar radio emission is not well understood because of a lack of knowledge about the emission geometry and the plasma process involved. We develop a mechanism for pulsar radio emission that takes into account the ...

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