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Browsing IIAP Publications by Title

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  • The VMC survey – XLI. Stellar proper motions within the small magellanic cloud 
    Niederhofer, Florian; Cioni, Maria-Rosa L; Rubele, Stefano; Schmidt, Thomas; Diaz, Jonathan D; Matijevic, Gal; Bekki, Kenji; Bell, C. P. M; de Grijs, Richard; Youssoufi, Dalal El; Ivanov, Valentin D; Oliveira, Joana M; Ripepi, Vincenzo; Subramanian, S; Sun, Ning-Chen; van Loon, Jacco Th (Oxford University Press on behalf of the Royal Astronomical Society, 2021-04)
    We used data from the near-infrared Visible and Infrared Telescope for Astronomy (VISTA) survey of the Magellanic Cloud system (VMC) to measure proper motions (PMs) of stars within the Small Magellanic Cloud (SMC). The ...
  • The VMC Survey – XLII. near-infrared period–luminosity relations for RR Lyrae stars and the structure of the large magellanic cloud 
    Cusano, F; Moretti, M. I; Clementini, G; Ripepi, V; Marconi, M; Cioni, M.-R. L; Rubele, S; Garofalo, A; de Grijs, R; Groenewegen, M. A. T; Oliveira, J. M; Subramanian, S; Sun, N.-C; van Loon, J. Th (Oxford University Press on behalf of the Royal Astronomical Society, 2021-06)
    We present results from an analysis of ∼29 000 RR Lyrae stars located in the Large Magellanic Cloud (LMC). For these objects, near-infrared time-series photometry from the VISTA survey of the Magellanic Clouds system (VMC) ...
  • The VMC survey – XLIV: mapping metallicity trends in the large magellanic cloud using near-infrared passbands 
    Choudhury, Samyaday; Grijs, Richard de; Bekki, Kenji; Cioni, Maria-Rosa L.; Ivanov, Valentin D.; Loon, Jacco Th. van; Miller, Amy E.; Niederhofer, Florian; Oliveira, Joana M.; Ripepi, Vincenzo; Sun, Ning-Chen; Subramanian, S (Oxford University Press on behalf of Royal Astronomical Society, 2021-11)
    We have derived high-spatial-resolution metallicity maps covering ∼105 deg2 across the Large Magellanic Cloud (LMC) using near-infrared passbands from the VISTA Survey of the Magellanic Clouds. We attempt to understand ...
  • The VMC survey – XLVI. Stellar proper motions in the centre of the Large Magellanic Cloud 
    Niederhofer, Florian; Cioni, Maria-Rosa L; Schmidt, Thomas; Bekki, Kenji; de Grijs, Richard; Ivanov, Valentin D; Oliveira, Joana M; Ripepi, Vincenzo; Subramanian, S; van Loon, Jacco Th (Oxford University Press on behalf of Royal Astronomical Society, 2022-06)
    We present proper motion (PM) measurements within the central region of the Large Magellanic Cloud (LMC), using nearinfrared data from the VISTA survey of the Magellanic Cloud system (VMC). This work encompasses 18 VMC ...
  • The VMC survey – XXXIV. Morphology of stellar populations in the Magellanic Clouds 
    Youssouf, Dalal El; Cioni, Maria-Rosa L; Bell, Cameron P. M; Rubele, Stefano; Bekki, Kenji; Grijs, Richard de; Girardi, Leo; Ivanov, Valentin D; Matijevic, Gal; Niederhofer, Florian; Oliveira, Joana M; Ripepi, Vincenzo; Subramanian, S; van Loon, Jacco Th (Oxford University Press on behalf of the Royal Astronomical Society, 2019-11)
    The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We ...
  • The VMC Survey. XXIX. Turbulence-controlled Hierarchical Star Formation in the Small Magellanic Cloud 
    Sun, N; de Grijs, R; Cioni, M. L; Rubele, S; Subramanian, S; van Loon, J. T; Bekki, K; Bell, C. P. M; Ivanov, V. D; Marconi, M; Muraveva, T; Oliveira, J. M; Ripepi, V (IOP Publishing, 2018-05-03)
    In this paper we report a clustering analysis of upper main-sequence stars in the Small Magellanic Cloud, using data from the VMC survey (the VISTA near-infrared YJK s survey of the Magellanic system). Young stellar ...
  • Voyager Observations of the Diffuse Far-ultraviolet Radiation Field 
    Murthy, J; Conn Henry, R; Holberg, Jay B (IOP Publishing, 2012-03)
    The two Voyager spacecraft have completed their planetary exploration mission and are now probing the outer realms of the heliosphere. The Voyager ultraviolet spectrometers continued to operate well after the Voyager 2 ...
  • VRI photometry of LMC SN 1987A 
    Rangarajan, K. E; Jayakumar, K; Appakutty, M; Sheriff, H. D (Konkoly Observatory, 1987-07)
  • VRI Photometry of M67 for CCD Standardization at 2.3m VBT 
    Bhat, P. N; Singh, K. P; Prabhu, T. P; Kembhavi, A. K (Indian Academy of Sciences, 1992)
    We present the results from CCD photometry in the V, R and I bands, of the ‘Dipper Asterism’ region of the open cluster Μ67 based on observations carried out at the prime focus of the 2.3 m Vainu Bappu Telescope of the ...
  • W. M. Keck observatory instrumentation status and future direction 
    Kassis, Marc; Allen, Steven L; Alverez, Carlos; Baker, Ashley; Banyal, Ravinder K; Bertz, Robert; Beichman, Charles; Brown, Aaron; Brown, Matthew; Bundy, Kevin; Cabak, Gerald; Cetre, Sylvain; Chin, Jason; Chun, Mark R; Cooke, Jeff; Delorme, Jacques; Deich, William; Dekany, Richard G; Devenot, Mark; Doppmann, Greg; Edelstein, Jerry; Fitzgerald, Michael P; Fucik, Jason R; Gao, Maodong; Gibson, Steve; Gillingham, Peter R; Gomez, Percy; Gottschalk, Colby; Halverson, Sam; Hill, Grant; Hinz, Philip; Holden, Bradford P; Howard, Andrew W; Jones, Tucker; Jovanovic, Nemanja; Kirby, Evan; Krishnan, Shanti; Kupke, Renate; Lanclos, Kyle; Larkin, James E; Leifer, Stephanie D; Lewis, Hilton A; Lilley, Scott; Lu, Jessica R; Lyke, James E; MacDonald, Nicholas; Martin, Christopher; Mather, John; Matuszewski, Mateusz; Mawet, Dimitri; McCarney, Ben; McGurk, Rosalie; Marin, Eduardo; Millar-Blanchaer, Maxwell A; Nance, Craig; Nash, Reston B; Neill, James D; O'Meara, John M; Peretz, Eliad; Poppett, Claire; Konopacky, Quinn; Radovan, Matthew V; Ragland, Sam; Rider, Kodi; Roberts, Mitsuko; Rockosi, Constance; Rubenzahl, Ryan; Sallum, Stephanie; Sandford, Dale; Savage, Maureen; Simha, Sunil; Skemer, Andy J; Steidel, Charles C; Stelter, Richard D; Surendran, Avinash; Walawender, Josh; Westfall, Kyle B; Wizinowich, Peter; Wright, Shelley; Yeh, Sherry (Wiley-VCH GmbH, 2023-10)
    Since the start of science operations in 1993, the twin 10-m W. M. Keck Observatory (WMKO) telescopes have continued to maximize their scientific impact and to produce transformative discoveries that keep the observing ...
  • Water vapour characteristics and radiative effects at high-altitude Himalayan sites 
    Dumka, U. C; Kaskaoutis, D. G; Khatri, Pradeep; Shantikumar, N. S; Sheoran, Rahul; Jade, Sridevi; Shrungeshwara, T. S; Rupakheti, Maheswar (Elsevier B.V., 2022-02)
    We analyze long-term aerosol and precipitable water vapour (PWV) properties at two high-altitude sites (Nainital and Hanle) over the central Himalayan and western Trans-Himalayan region from 2008 to 2018. First-time ...
  • Wave propagation and energy transport in the magnetic network of the Sun 
    Vigeesh, G; Hasan, S. S; Steiner, O (European Southern Observatory, 2009-12)
    Aims. We investigate wave propagation and energy transport in magnetic elements, which are representatives of small scale magnetic flux concentrations in the magnetic network on the Sun. This is a continuation of earlier ...
  • Wave propagation in multiple flux tubes and chromospheric heating 
    Hasan, S. S; van Ballegooijen, A; Steiner, O (Cambridge University Press, 2008-05)
    This investigation is a continuation of earlier work on the dynamics of the magnetic network. In a previous calculation (Hasan et al. 2005), we examined the response of a single flux tube to transverse motions of its ...
  • Wave propagation in sunspots 
    Hasan, S. S (International Astronomical Union, 1990)
    Wave propagation in sunspot umbrae is analyzed; the stratification in a typical umbra is approximated by a model atmosphere, extending vertically from a depth of a few thousand kilometers below the photosphere, to the ...
  • Wave propagation in the magnetic network on the Sun 
    Hasan, S. S; Vigeesh, G; van Ballegooijen, A. A (Cambridge University Press, 2006)
    Hasan et al. (2005) have recently presented 2-D dynamical calculations on wave propagation in in the magnetic network of the Sun. The latter is idealized as consisting of non-potential flux tubes in the quiet solar ...
  • Wavefront sensing and evaluation using two crossed Babinet Compensators 
    Saxena, A. K; Lancelot, J. P (SPIE-The International Society for Optical Engineering, 1990)
    The use of crossed Babinet Compensator (B. C.) combination as simple and effective device for wavefront sensing and evaluation has been described. This method can be utilized for on line evaluation of the wavefront or the ...
  • Wavelength calibration of a tunable spatial heterodyne spectrometer 
    Nirmal, K; Sridharan, R; Sriram, S; Ambily, S; Mathew, J; Mayuresh, Sarpotdar; Murthy, J; Binukumar, G; Safonova, M (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Spatial Heterodyne Spectroscopy (SHS) is a relatively novel interferometric technique similar to Fourier transform spectroscopy and shares design similarities with a Michelson Interferometer. An Imaging detector is used ...
  • Waves in polar coronal holes 
    Banerjee, D (Springer, 2010)
    The fast solar wind originates from polar coronal holes. Recent observations from SoHO suggest that the solar wind is flowing from funnel-shaped magnetic fields anchored in the lanes of the magnetic network at the solar ...
  • Waves in the solar photosphere 
    Pandey, B. P; Vranjes, J; Krishan, V (Blackwell Synergy, 2008-05)
    The solar photosphere is a partially ionized medium with collisions between electrons, various metallic ions and neutral hydrogen playing an important role in the momentum and energy transport in the medium. Furthermore, ...
  • Waves in the sunspot penumbra 
    Antia, H. M; Chitre, S. M; Gokhale, M. H (Springer, 1978-11)
    Sunspot theory is discussed with reference to the role played by the spot magnetic field in influencing the mode of energy transport. Consideration is given to the stability of a plane parallel polytropic fluid layer with ...

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