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Browsing IIAP Publications by Title

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  • Duration of star formation in young open clusters 
    Bhavya, B; Subramaniam, A; Kuriakose, V. C (Astronomical Society of India, 2012)
    Young Open Clusters have always been a platform for the star formation studies. It was assumed that all members in the cluster are coeval, on the other hand, recent studies show the presence of an age range among the members ...
  • Dust and ionized gas in NGC 3607 
    Singh, K. P; Prabhu, T. P; Kembhavi, A. K; Bhat, P. N (The American Astronomical Society, 1994-04)
    We report the detection of a broad dust ring in the X-ray-bright elliptical galaxy NGC 3607, the dominant member of a nearby group of galaxies. The inner radius of the ring is approximately 1.3 kpc from the nucleus and has ...
  • Dust around R Coronae Borealis Stars. I. Spitzer/Infrared Spectrograph Observations 
    Aníbal García-Hernández, D; Kameswara Rao, N; Lambert, D. L (IOP Publishing, 2011-09-20)
    Spitzer/infrared spectrograph (IRS) spectra from 5 to 37 μm for a complete sample of 31 R Coronae Borealis stars (RCBs) are presented. These spectra are combined with optical and near-infrared photometry of each RCB at ...
  • Dust Around R Coronae Borealis Stars. II. Infrared Emission Features in an H-poor Environment 
    Garcia-Hernandez, D. A; Kameswara Rao, N; Lambert, D. L (IOP Publishing, 2013-08-20)
    Residual Spitzer/Infrared Spectrograph spectra for a sample of 31 R Coronae Borealis (RCB) stars are presented and discussed in terms of narrow emission features superimposed on the quasi-blackbody continuous infrared ...
  • The dust content and radiation fields of sample of galaxies in the ELAIS-N1 field 
    Shalima, P; Gogoi, R; Pathak, A; Misra, R; Gupta, R; Vaidya, D. B (The University of Chicago Press on behalf of the Astronomical Society of the Pacific, 2015-08)
    The Mid-IR colors (F8/F24) of galaxies together with their IR-UV luminosity correlations can be used to get some insight into the relative abundance of the different dust grain populations present in them. The ELAIS-N1 ...
  • Dust envelopes around RV Tauri stars 
    Raveendran, A. V (The Royal Astronomical Society, 1989-06)
    In the IRAS (12)-(25), (25)-(60) color-color diagram, RV Tauri stars are found to populate cooler temperature regions, distinctly different from those occupied by the oxygen and carbon Miras. The IRAS fluxes are consistent ...
  • The dust grains in the coma of Comet West 
    Krishna Swamy, K. S; Shah, G. A (D. Reidel Publishing Co, 1987-07)
    The observed variation of reddening as a function of the heliocentric distance and the spatial variation of reddening within the coma of Comet West in the visual wavelength range have been considered to infer the properties ...
  • Dust in the Outer Layers of Stars 
    Ingalgi, M. F (Indian Institute of Astrophysics, Bangalore, 1990-08)
  • A Dust Lane in the Radio Galaxy 3C 270 
    Mahabal, A; Kembhavi, A; Singh, K. P; Bhat, P. N; Prabhu, T. P (American Astronomical Society, 1996-02)
    We present the broad band surface photometry of the radio galaxy 3C 270 (NGC 4261). We find a distinct dust lane in the V - R image of the galaxy and determine its oriantation and size. We use the major axis profile of the ...
  • Dust properties from GALEX observations of a UV halo around Spica 
    Shalima, P; Murthy, J; Gupta, R (Terra Scientific Publishing Company, 2013-10-24)
    GALEX has detected ultraviolet halos extending as far as 5° around four bright stars (Murthy and Henry, 2011). These halos are produced by scattering of starlight by dust grains in thin foreground clouds that are not ...
  • Dust Properties in the Far-Ultraviolet in Ophiuchus 
    Sujatha, N. V; Shalima, P; Murthy, J; Henry, R. C (The American Astronomical Society, 2005-11)
    We have derived the albedo (a) and phase function asymmetry factor (g) of interstellar dust grains at 1100 Å using archival Voyager observations of diffuse radiation in Ophiuchus. We have found that the grains are highly ...
  • Dust reverberation mapping of Z229–15 
    Mandal, A. K; Rakshit, S; Stalin, C. S; Wylezalek, D; Patig, M. K; Sagar, R; Mathew, B; Muneer, S; Pal, I (Oxford University Press on behalf of the Royal Astronomical Society, 2021-03)
    We report results of the dust reverberation mapping (DRM) on the Seyfert 1 galaxy Z229–15 at z = 0.0273. Quasi-simultaneous photometric observations for a total of 48 epochs were acquired during the period 2017 July to ...
  • Dust scattered radiation in the galactic poles 
    Murthy, J; Henry, R. C; Overduin, James (Indian Academy of Sciences, 2023-12)
    We have modeled the diffuse background at the Galactic Poles in the far-ultraviolet (FUV: 1536 Å) and the near-ultraviolet (NUV: 2316 Å). The background is well-fit using a single-scattering dustmodel with an offset ...
  • Dust scattering from the taurus molecular cloud 
    Sathya Narayan; Murthy, J; Narayanankutty, K (Oxford University Press on behalf of the Royal Astronomical Society, 2017-04)
    We present an analysis of the diffuse ultraviolet emission near the Taurus Molecular Cloud based on observations made by the Galaxy Evolution Explorer. We used a Monte Carlo dust scattering model to show that about half ...
  • Dust-Alfvenic Shocklets in Dusty Plasmas 
    Shukla, P. K; Morfill, G. E; Krishan, V (IOP Publishing, 2004)
    We show that the Hall dust magnetohydrodynamic equations admit a non-stationary dust-Alfvénic shock solution in dusty plasmas. The dust-Alfvénic shocklet (DAS) occurs on a long temporal (dust gyroperiod) and spatial (dust ...
  • Dust-scattered Ultraviolet Halos around Bright Stars 
    Murthy, J; Conn Henry, R (IOP Publishing, 2011-06-10)
    We have discovered ultraviolet (UV) halos extending as far as 5° around four (of six) bright UV stars using data from the Galaxy Evolution Explorer satellite. These halos are due to scattering of the starlight from nearby ...
  • Dynamic Loading Assembly for Testing Actuators of Segmented Mirror Telescope 
    Prasanna Deshmukh; Parihar, P. S; Balasubramaniam, K. A; Mishra, Deepta Sundar; Mahesh, P. K (World Scientific Publishing Co., 2017-09)
    Upcoming large telescopes are based on Segmented Mirror Telescope (SMT) technology which uses small hexagonal mirror segments placed side by side to form the large monolithic surface. The segments alignment needs to be ...
  • Dynamic responses of sunspots to their ambient magnetic configuration 
    Bagare, S. P (Cambridge University Press, 2011-08)
    In our earlier study of a revisit of the classic Wilson Effect, it was found that a large proportion of sunspots do not display the geometric effect which is ascribed to a depression of the umbra. It was shown that the ...
  • The dynamical behaviour of a jet in an on-disk coronal hole observed with AIA/SDO 
    Chandrashekhar, K; Morton, R. J; Banerjee, D; Gupta, G. R (EDP Sciences, 2014-02)
    Aims. Extreme ultraviolet (EUV) jets situated in coronal holes are thought to play an important role in supplying heated material to the corona and solar wind. The multi-wavelength capabilities and high signal-to-noise ...
  • Dynamical Effects in Solar Photospheric Flux Tubes 
    Hasan, S. S (Kluwer Academic Publisher, 1996)
    The interaction of an intense flux tube, extending vertically through the photosphere, with p-modes in the ambient medium is modelled by solving the time dependent MHD equations in the thin flux tube approximation. It is ...

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