Browsing IIAP Publications by Title

Landslide susceptibility analysis using probabilistic likelihood ratio model—a geospatial-based study

Sujatha, E. R; Rajamanickam, V; Kumaravel, P; Saranathan, E (Springer, 2013-02)

The crucial and difficult task in landslide susceptibility analysis is estimating the probability of occurrence of future landslides in a study area under a specific set of geomorphic and topographic conditions. This task ...

Landslide Susceptibility Mapping Using Remotely Sensed Data through Conditional Probability Analysis Using Seed Cell and Point Sampling Techniques

Sujatha, E. R; Kumaravel, P; Rajamanickam, V. G (Springer, 2012-12)

Rapid urbanization, intense infra-structure development and increased tourism related activities have resulted in the change of landscape of the Kodaikkanal town and its surrounding, a popular hill town in Tamilnadu, South ...

A Large Decametric Wavelength Antenna Array for IPS Observations of Radio Sources

Sastry, Ch. V (International Astronomical Union, 1980)

Large dust grains in the dark cloud B5

Bhatt, H. C (Royal Astronomical Society, 1986-09)

Polarization measurements of stars in the region of the dark cloud B5 indicate that the average dust grain size in the cloud is much larger than the mean interstellar grain size. Within the cloud, the average grain size ...

Large Magellanic Cloud Bar: Evidence of a Warped Bar

Subramaniam, A (The European Southern Observatory, 2003-11)

The geometry of the LMC bar is studied using the dereddened mean magnitudes of the red clump stars (I0) from the Optical Gravitational Lensing Experiment II catalog. The value of I0 is found to vary in the east-west direction ...

The large Magellanic cloud R CrB Star - HV 12842

Morgan, D. H; Nandy, K; Kameswara Rao, N (D. Reidel Publishing Co, 1986)

This paper describes the behaviour of HV 12842 during the period 1976 - 1985 as it appears on the 38 I plates of LMC(N) taken with the UK 1.2 m Schmidt Telescope.

Large number coincidences and unification of the parameters underlying elementary particles astrophysics and cosmology

Sivaram, C (World Scientific, 1984)

The Ubiquitous occurrence of the Dirac-Eddington large dimensionless numbers when relating the physical parameters such as mass, radius, angular momentum etc. of typical astrophys1cal objects like stars and galax1es to ...

Large optical mirror making technology and facility at Indian Institute of Astrophysics

Saxena, A. K (SPIE-The International Society for Optical Engineering, 1990)

Indian Institute of Astrophysics (IIA) has recently completed building of 2.34 MTelescopeS Optics for the same was fabricated in the Optical shop of the Institute. Thepaper describes the technology used in making 2.34 M ...

A large sample of newly identified carbon-deficient red giants from APOGEE

Maben, Sunayana; Bharat Kumar, Y; Reddy, B. E; Campbell, Simon W; Zhao, Gang (Oxford University Press on behalf of Royal Astronomical Society, 2023-11)

Based on the Apache Point Observatory Galactic Evolution Experiment survey we conducted a search for carbon-deficient red giants (CDGs). We found 103 new CDGs, increasing the number in the literature by more than a factor ...

Large scale extinction maps with UVIT

Ravichandran, S; Preethi, K; Safonova, M; Murthy, J (Springer, 2013-04)

The Ultraviolet Imaging Telescope (UVIT) is scheduled to be launched as a part of the ASTROSAT satellite. As part of the mission planning for the instrument we have studied the efficacy of UVIT observations for interstellar ...

The large sunspot group of July 1946*

The Director, Solar Physics Observatory (National Institute of Science Communication And Information Resources, 1946-11)

Large-scale flow patterns in the solar atmosphere

Sivaraman, K. R (International Astronomical Union, 1990)

One of the results of a study on the migration of H-alpha filaments, namely, the existence of meridional flow on the sun, is presented and extended to show the participation of this meridional flow in the solar cycle ...

The large-scale magnetic field in the global solar cycle: observational aspects

Makarov, V. I; Sivaraman, K. R (Springer, 1991)

The global solar cycle is considered as an interaction of 3 types of activity: at low-latitude (sunspots), at high-latitude (polar faculae) and the weak magnetic field. The properties of single and 3-fold reversals of the ...

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 ...

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 ...

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 ...

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Browsing IIAP Publications by Title

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