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  • Large-scale Wind Structures in OB Supergiants: a Search for Rotationally Modulated Hα variability 
    Morel, T; Marchenko, S. V; Pati, A. K; Kuppuswamy, K; Carini, M. T (Astronomical Society of India, 2003)
    We present preliminary results of a long-term spectroscopic monitoring of a sample of bright OB-supergiants aimed at establishing the incidence of co-rotating, large-scale wind structures by detecting rotationally modulated ...
  • Large-scale wind structures in OB supergiants: a search for rotationally modulated Hα variability 
    Morel, T; Marchenko, S. V; Pati, A. K; Kuppuswamy, K; Carini, M. T; Wood, E; Zimmerman, R (The Royal Astronomical Society, 2004-06)
    We present the results of a long-term monitoring campaign of the Hα line in a sample of bright OB supergiants (O7.5-B9) which aims at detecting rotationally modulated changes potentially related to the existence of large-scale ...
  • Largest QSO Redshift 
    Narlikar, J. V (Astronomical Society of India, 1973)
  • Laser Damage Threshold studies on Ion Plated Perylene Thin Films 
    Subbarayan, A; Balasubramanian, C; Narayandass, Sa. K (Indian Institute of Astrophysics, Bangalore, 1991)
    Perylene thin films were deposited on cleaned glass substrates by ion plating technique in r.f.glow (10 MHz) sustained by argon gas of pressure 0.399 Pa. Laser-induced damage threshold of these thin films has been studied ...
  • Laser guide artificial star for high resolution imaging 
    Saha, S. K (Indian Association for the Cultivation of Science, 2006)
    A large telescope encodes the information about the source, but unable to get the di raction-limited informations. Due to the inhomogeneity of the propagating medium that carries the light to the Earth's surface, the ...
  • A laser-lock concept to reach cm-1s-precision in Doppler experiments with Fabry-Perot wavelength calibrators 
    Reiners, A; Banyal, R. K; Ulbrich, R. G (EDP Sciences, 2014-09)
    State-of-the-art Doppler experiments require wavelength calibration with precision at the cm s − 1 level. A low-finesse Fabry-Pérot interferometer (FPI) can provide a wavelength comb with a very large ...
  • The late C. Ragoonatha Chary F.R.A.S 
    Madras Mail (Madras Mail, 1880-02-07)
  • Late time X-ray, IR and radio observations of the tidal disruption event galaxy NGC 5905 
    Raichur, H; Mousumi Das; Herrero, A. A; Shastri, P; Kantharia, N. G (Springer, 2015-04)
    NGC 5905 is one of the few galaxies with no prior evidence for an active galactic nucleus (AGN) in which an X-ray flare was detected by the ROSAT All Sky Survey (RASS) in 1990–1991. Follow-up studies showed that the X-ray ...
  • Late-type giants with infrared excess. I. Lithium abundances 
    Jasniewicz, G; Parthasarathy, M; de Laverny, P; Thévenin, F (European Southern Observatory, 1999-02)
    de la Reza et al. (1997) suggested that all K giants become Li-rich for a short time. During this period the giants are associated with an expanding thin circumstellar shell supposedly triggered by an abrupt internal mixing ...
  • The latest two GRB detected by Hete-2: GRB 051022 and GRB 051028 
    Castro-Tirado, A. J; McBreen, S; Jelínek, M; Pandey, S. B; Bremer, M; de Ugarte Postigo, A; Gorosabel, J; Guziy, S; Bihain, G; Caballero, J. A; Ferrero, P; de Jong, J; Misra, K; Sahu, D. K (American Institute of Physics, 2006-05)
    We present multiwavelength observations of the latest two GRB detected by Hete-2 in 2005. For GRB 051022, no optical/nIR afterglow has been detected, in spite of the strong gamma-ray emission and the reported X-ray afterglow ...
  • Latitude character and evolution of Gnevyshev gap 
    Pandey, K. K; Hiremath, K. M; Yellaiah, G (Springer, 2017-06)
    The time interval, between two highest peaks of the sunspot maximum, during which activity energy substantially absorbed is called Gnevyshev gap. In this study we focus on mysterious evolution of the Gnevyshev gap by ...
  • Latitude Distribution of Sunspots: Analysis Using Sunspot Data and a Dynamo Model 
    Mandal, Sudip; Karak, B. B; Banerjee, D (2017-12)
    In this paper, we explore the evolution of sunspot latitude distribution and explore its relations with the cycle strength. With the progress of the solar cycle, the distributions in two hemispheres from mid-latitudes ...
  • Latitudinal distribution of soft x ray flares and dispairty in butterfly diagram 
    Pandey, K. K; Yellaiah, G; Hiremath, K. M (Springer, 2015-04)
    We present statistical analysis of about 63000 soft x-ray flare (class ≥C) observed by geostationary operational environmental satellite (GOES) during the period 1976-2008. Class wise occurrence of soft X-ray (SXR) flare ...
  • Leaves from an unwritten diary- S.Chandrashekhar: Reminiscences and reflections 
    Vishveshwara, C. V (Current Science Association, 2000-04)
  • Leh: a high altitude site survey observatory 
    Kochhar, R. K (Indian Institute of Astrophysics, Bangalore, 1986-07)
  • Lenses of small angular scales from Jodrell Bank survey 
    Patnaik, A; Narasimha, D (Astronomical Society of India, 1993)
    The Jodrell Bank 5 GHz sky survey provides a complete flux-limited sample of radio sources at latitude greater than 2.5 deg which are brighter than 200 mJy and have a spectrum flatter than 0.5. From the analysis of nearly ...
  • Lenticular and other galaxies 
    Kembhavi, A. K; Barway, Sudhanshu; Ravi Kumar, C. D (Astronomical Society of India, 2005-06)
    We describe in this paper the surface photometry of a set of lenticular galaxies. We then consider important correlations between morphological parameters of the bulges of lenticulars and other types of galaxies
  • Leo Goldberg, Astronomer, Dies 
    The New York Times (The New York Times, 1987-11-03)
  • Lepto-hadronic Interpretation of 2021 RS Ophiuchi Nova Outburst 
    De Sarkar, Agnibha; Nayana, A. J; Roy, Nirupam; Razzaque, Soebur; Anupama, G. C (American Astronomical Society, 2023-07-01)
    Very-high-energy (VHE; 100 GeV < E ≤ 100 TeV) and high-energy (HE; 100 MeV < E ≤ 100 GeV) gamma rays were observed from the symbiotic recurrent nova RS Ophiuchi (RS Oph) during its outburst in 2021 August by various ...
  • Lepton loss and entropy generation in stellar collapse 
    Datta, B; Deo, P. P (D. Reidel Publishing Co., 1983-02)
    The effects of uncertainties in determining the loss of neutrinos and the generation of entropy during the collapse of a stellar core are studied using a simple spherically-symmetric homologous collapse model with an ...

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