IIAP Publications: Recent submissions

  • A study of the effect of bulges on bar formation in disc galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We use N-body simulations of bar formation in isolated galaxies to study the effect of bulge mass and bulge concentration on bar formation. Bars are global disc instabilities that evolve by transferring angular momentum ...
  • The 3-Dimensional Distribution of Interstellar Dust 
    Murthy, J (Cambridge University Press, 2014-01)
    A knowledge of the three dimensional distribution of interstellar dust is critical in interpreting all observations of the sky, particularly in the understanding of the structure and morphology of our Galaxy. It has been ...
  • A study of the effect of bulges on bar formation in disc galaxies 
    Kataria, Sandeep Kumar; Mousumi Das (Oxford University Press on behalf of the Royal Astronomical Society, 2018-04)
    We use N-body simulations of bar formation in isolated galaxies to study the effect of bulge mass and bulge concentration on bar formation. Bars are global disc instabilities that evolve by transferring angular momentum ...
  • Dark matter, dark energy, and alternate models: A review 
    Arun, k; Gudennavar, S.B; Sivaram, C (Elsevier B.V, 2017-07)
    The nature of dark matter (DM) and dark energy (DE) which is supposed to constitute about 95% of the energy density of the uni-verse is still a mystery. There is no shortage of ideas regarding the nature of both. While ...
  • Identifying Li-rich giants from low-resolution spectroscopic survey 
    Bharat Kumar, Y; Reddy, B. E; Zhao, G (Indian Academy of Sciences, 2018-04)
    In this paper we discuss our choice of a large unbiased sample used for the survey of red giant branch stars for finding Li-rich K giants, and the method used for identifying Li-rich candidates using low-resolution spectra. ...
  • SPECTROSCOPY OF BRIGHT ALGOL-TYPE SEMI-DETACHED CLOSE BINARY SYSTEM HU TAURI (HR 1471) 
    Parthasarathy, M (Konkoly Observatory, 2018-01-23)
    Radial velocities of the primary component (B8V) of HU Tauri derived from the photographic spectra obtained during January 1974 to December 1974 and spectroscopic orbital elements from the analysis of the radial velocity ...
  • Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1 
    Raj Kumar, Nalla; Prasad, B. R; Singh, J; Venkata Suresh, Narra (Springer, 2018-04)
    The ground based observations of the coronal emission lines using a coronagraph are affected by the short duration of clear sky and varying sky transparency. These conditions do not permit to study small amplitude variations ...
  • Flares before and after coronal mass ejections 
    Suryanarayana, G. S (IOP Publishing, 2018-03)
    Flare characteristics such as the flare occurrence number density and the distribution of peak flux as well as duration of flares occurring on either side of a coronal mass ejection (CME) onset time are studied. While the ...
  • Low resolution spectroscopy of selected Algol systems 
    Shanti Priya Devarapalli; Rukmini Jagirdar; Parthasarathy, M; Sahu, D. K; Mohan, V; Bhatt, B. C; Thomas, V. S (Springer, 2018-04)
    The analysis of spectroscopic data for 30 Algol-type binaries is presented. All these systems are short period Algols having primaries with spectral types B and A. Dominant spectral lines were identified for the spectra ...
  • THE VARIABLE STAR POPULATION IN THE GLOBULAR CLUSTER NGC 6934 
    Yepez, M. A; Ferro, A. A; Muneer, S; Giridhar, S (Instituto de Astronomia, 2018-04)
    We report an analysis of new V and I CCD time-series photometry of the globular cluster NGC 6934. Through the Fourier decomposition of the RR Lyrae light curves the mean values of [Fe/H] and the distance of the cluster ...
  • NIR properties of Be stars in star clusters in the Magellanic Clouds 
    Paul, K. T; Subramaniam, A; Mathew, B; Shruthi, S. B (Elsevier B.V, 2017-10)
    Magellanic Clouds are the nearby galaxies which are ideal to study the properties of metal poor stellar population. In this study, we explore the near-IR properties of optically identified classical Be stars in 19 star ...
  • Coronal Proerties of the Seyfert 1 Galaxy 3C 120 with NuSTAR 
    Priyanka Rani; Stalin, C. S (IOP Publishing, 2018-04-01)
    We present a measurement of the cut-off energy, a proxy for the temperature of the corona in the nuclear continuum of the Seyfert 1 galaxy 3C 120 using ~120 ks of observation from NuSTAR. The quality broadband spectrum ...
  • CME productivity associated with Solar Flare peak X-ray emission flux 
    Suryanarayana, G. S; Balakrishna, K. M (Elsevier B.V, 2018-05-01)
    It is often noticed that the occurrence rate of Coronal Mass Ejections (CMEs) increases with increase in flare duration where peak flux too increase. However, there is no complete association between the duration and peak ...
  • Variation of supergranule parameters with solar cycles: results from century-long Kodaikanal digitized Ca II K data 
    Chatterjee, Subhamoy; Mandal, Sudip; Banerjee, D (IOP Publishing, 2017-05)
    The Ca ii K spectroheliograms spanning over a century (1907–2007) from Kodaikanal Solar Observatory, India, have recently been digitized and calibrated. Applying a fully automated algorithm (which includes contrast enhancement ...
  • Once in a blue moon: detection of bluing' during debris transits in the white dwarf WD 1145+017 
    Hallakoun, N; Xu, S; Maoz, D; Marsh, T. R; Ivanov, V. D; Dhillon, V. S; Bours, M. C. P; Parsons, S. G; Kerry, P; Sharma, S; Su, K; Sridharan, R|; Pravec, P; Kusnirak, P; Kucakova, H; Armstrong, J. D; Arnold, C (Oxford University Press on behalf of the Royal Astronomical Society, 2017-08)
    The first transiting planetesimal orbiting a white dwarf was recently detected in K2 data of WD 1145+017 and has been followed up intensively. The multiple, long and variable transits suggest the transiting objects are ...
  • V2676 Oph: Estimating Physical Parameters of a Moderately Fast Nova 
    Raj, A; Pavana, M; Kamath, U. S; Anupama, G. C; Walter, F. M (Copernicus Foundation for Polish Astronomy, 2018-03)
    Using our previously reported observations, we derive some physical parameters of the moderately fast nova V2676 Oph 2012 #1. The best-fit CLOUDY model of the nebular spectrum obtained on 2015 May 8 shows a hot white dwarf ...
  • Hanle-Zeeman Scattering Matrix for Magnetic Dipole Transitions 
    Megha, A; Sampoorna, M; Nagendra, K. N; Sankarasubramanian, K (IOP Publishing, 2017-07)
    The polarization of the light that is scattered by the coronal ions is influenced by the anisotropic illumination from the photosphere and the magnetic field structuring in the solar corona. The properties of the coronal ...
  • Theoretical analysis of effective electric fields in mercury monohalides 
    Srinivasa Prasannaa, V; Abe, M; Bannur, V. M; Das, B. P (The American Physical Society, 2017-04)
    Mercury monohalides are promising candidates for electron electric dipole moment searches. This is due to their extremely large values of effective electric fields, besides other attractive experimental features. We have ...
  • On Minkowski Functionals of CMB polarization 
    Pravabati, C; Vidhya, G; Yogendran, K. P; Park, C (Elsevier B.V, 2017-08)
    CMB polarization data is usually analyzed using Eand Bmodes because they are scalar quantities under rotations along the lines of sight and have distinct physical origins. We explore the possibility of using the Stokes ...
  • Static structure of chameleon dark matter as an explanation of dwarf spheroidal galaxy cores 
    Das, Subinoy; Prolay Krishna Chanda (The American Physical Society, 2017-04)
    We propose a novel mechanism that explains the cored dark matter density profile in recently observed dark matter rich dwarf spheroidal galaxies. In our scenario, dark matter particle mass decreases gradually as a function ...

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