IIAP Publications: Recent submissions

  • Multiwavelength Study of the NGC 281 Region 
    Sharma, S; Pandey, A. K; Pandey, J. C; Chauhan, N; Ogura, K; Ojha, D. K; Borrissova, J; Mito, H; Verdugo, T; Bhatt, B. C (Astronomical Society of Japan, 2012-10)
    We present a multiwavelength study of the NGC 281 complex which contains the young cluster IC 1590 at the center, using deep wide-field optical UBV Ic photometry, slitless spectroscopy along with archival data sets in ...
  • Optical studies of novae 
    Anupama, G. C; Kamath, U. S (Astronomical Society of India, 2012-09)
    We review the observational characteristics of classical and recurrent novae in the optical region, in the context of observational programmes carried out using telescopes at the Vainu Bappu Observatory (VBO) and the ...
  • Concept study of an « Extremely Large Hyper Telescope » (ELHyT) with 1200m sparse aperture for direct imaging at 100 micro-arcsecond resolution 
    Labeyrie, A; Mourard, D; Allouche, F; Charkraborthy, R; Dejonghe, J; Arun Surya; Bresson, Y; Aime, C; Mary, D; Carlotti, A (SPIE--The International Society for Optical Engineering, 2012-09)
    The hypertelescope construction initiated in the Southern Alps (Labeyrie et al., this conference) has provided some preliminary operating experience indicating that larger versions, up to perhaps 1200m, are probably ...
  • Construction of a 57m hypertelescope in the southern Alps 
    Labeyrie, A; Allouche, F; Mourard, D; Bolgar, F; Chakraborthy, R; Maillot, J; Palitzyne, N; Poletti, J. R; Rochaix, J. P; Prud homme, R; Rondi, A; Roussel, M; Arun Surya (SPIE--The International Society for Optical Engineering, 2012-09)
    For information-rich direct images at high resolution, hypertelescopes combine light from a sparse array of many subapertures, using pupil densi cation. Among the possible architectures, the Arecibo-like spherical class has ...
  • Optical Photometric and Polari metric investigation of NGC 1931 
    Pandey, A. K; Eswaraiah, C; Sharma, S; Samal, M. R; Chauhan, N; Chen, W. P; Jose, J; Ojha, D. K; Yadav, Ram Kesh; Chandola, H. C (IOP Publishing, 2013-02-05)
    We present optical photometric and polarimetric observations of stars toward NGC 1931 with the aim of deriving cluster parameters such as distance, reddening, age, and luminosity/mass function as well as understanding dust ...
  • A study of the performance parameters of the High Altitude Gamma Ray (HAGAR) telescope system at Ladakh in India 
    Saha, L; Chitnis, V. R; Vishwanath, P. R; Kale, S; Shukla, A; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Prabhu, T. P; Singh, B. B (Elsevier Science B.V., 2013-02)
    We present results of Monte Carlo simulations for the High Altitude Gamma Ray (HAGAR) telescope array which detects very high energy gamma rays from astronomical sources. This telescope array, located at Hanle at an altitude ...
  • SUBARU/HDS Study of HE 1015−2050: Spectral Evidance of R Coronae Borealis Light Decline 
    Goswami, A; Aoki, Wako (IOP Publishing, 2013-02-01)
    Hydrogen deficiency and a sudden optical light decline of about 6-8 mag are two principal characteristics of R Coronae Borealis (RCB) stars. The high latitude carbon star HE 1015–2050 was identified as a hydrogen-deficient ...
  • भारतीय खगोल वेधशाला हैनले, लद्दाख 
    भट्ट, बी. सी (NISCAIR-CSIR, 2012-12)
  • RRI-GBT multi-band receiver: motivation, design, and development 
    Maan, Yogesh; Deshpande, Avinash A; Chandrashekar, Vinutha; Chennamangalam, Jayanth; Raghavendra Rao, K. B; Somashekar, R; Anderson, Gary; Ezhilarasi, M. S; Sujatha, S; Kasturi, S; Sandhya, P; Bauserman, Jonah; Duraichelvan, R; Amiri, Shahram; Aswathappa, H. A; Barve, Indrajit V; Sarabagopalan, G; Ananda, H. M; Beaudet, Carla; Bloss, Marty; Dhamnekar, Deepa B; Egan, Dennis; Ford, John; Krishnamurthy, S; Mehta, Nikhil; Minter, Anthony H; Nagaraja, H. N; Narayanaswamy, M; O'Neil, Karen; Raja, Wasim; Sahasrabudhe, Harshad; Shelton, Amy; Srivani, K. S; Venugopal, H. V; Viswanathan, Salna T (IOP Publishing, 2013-01)
    We report the design and development of a self-contained multi-band receiver ( MBR ) system, intended for use with a single large aperture to facilitate sensitive and high time-resolution observations simultaneously in 10 ...
  • Coronal Rotation from XBPs Observed with Hinode/XRT 
    Kariyappa, R; DeLuca, E (Astronomical Society of the Pacific, 2012-05)
    We have selected a large number of X-ray bright points (XBPs) over synoptic soft X-ray full-disk images observed using Al-Mesh with X-Ray Telescope (XRT) onboard the Hinode spacecraft during July-December, 2008. We have ...
  • Contribution of HdC Stars to the Galactic Enrichment: The Sr-rich HdC Star HE 1015-2050 
    Goswami, A; Aoki, W (Astronomical Society of the Pacific, 2012-08)
    A fraction of the rare class of Hydrogen-deficient carbon (HdC) stars in our Galaxy are known to exhibit strong features of light neutron-capture elements such as Sr, Y and Zr usually attributed to the weak component of ...
  • Low-frequency radio observations of picoflare category energy releases in the solar atmosphere 
    Ramesh, R; Sasikumar Raja, K; Kathiravan, C; Satya Narayanan, A (IOP Publishing, 2013-01-10)
    We report low-frequency (80 MHz) radio observations of circularly polarized non-thermal type I radio bursts ("noise storms") in the solar corona whose estimated energy is ~1021 erg. These are the weakest energy release ...
  • The galactic R coronae borealis stars and the final he-shell flash object V4334Sgr (Sakurai’s object): a comparison 
    Hema, B. P; Pandey, G; Lambert, D. L (Proceedings of Science, 2012-08)
    The high resolution optical spectra of H-deficient stars, R Coronae Borealis stars and H-deficient carbon stars are analyzed by synthesizing the C2 Swan bands (0,1), (0,0), and (1,0) using our detailed line-list and ...
  • Very-Low-Mass Stellar and Substellar Companions to Solar-Like Stars From Marvels. III. A Short-period Brown Dwarf Candidate Around An Active GOIV Subgiant 
    Ma, Bo; Ge, J; Barnes, R; Crepp, J. R; De Lee, N; Dutra-Ferreira, L; Esposito, M; Femenia, B; Fleming, S. W; Gaudi, B. S; Ghezzi, L; Hebb, L; Gonzalez Hernandez, J. I; Lee, B. L; Porto de Mello, G. F; Stassun, K. G; Wang, J; Wisniewski, J. P; Agol, E; Bizyaev, D; Cargile, P; Chang, L; Nicolaci da Costa, L; Eastman, J. D; Gary, B; Jiang, P; Kane, S. R; Li, R; Liu, J; Mahadevan, S; Maia, M. A. G; Muna, D; Nguyen, D. C; Ogando, R. L. C; Oravetz, D; Pepper, J; Paegert, M; Prieto, C. A; Rebolo, R; Santiago, B. X; Schneider, D. P; Shelden, A; Simmons, A; Sivarani, T; van Eyken, J. C; Wan, X; Weaver, B. A; Zhao, Bo (IOP Publishing, 2013-01)
    We present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature T eff = 5903 ± 42 K, surface gravity log (g) = 4.07 ± 0.16 ...
  • High-resolution spectroscopy of extremely metal-poor stars from SDSS/SEGUE. I. Atmospheric parameters and chemical compositions 
    Aoki, W; Beers, T. C; Lee, Young Sun; Honda, S; Ito, H; Takada-Hidai, M; Frebel, A; Suda, T; Fujimoto, M. Y; Carollo, D; Sivarani, T (IOP Publishing, 2013-01)
    Chemical compositions are determined based on high-resolution spectroscopy for 137 candidate extremely metalpoor (EMP) stars selected from the Sloan Digital Sky Survey (SDSS) and its first stellar extension, the ...
  • On turbulent fragmentation and the origin of the stellar IMF 
    Anathpindika, S (Elsevier, 2013-01)
    Two varieties of the universal stellar initial mass function (IMF) viz., the Kroupa and the Chabrier IMF, have emerged over the last decade to explain the observed distribution of stellar masses. The possibility of the ...
  • Polarimetric studies of carbon stars at high galactic latitude 
    Goswami, A; Drisya, K (EDP Sciences, 2013-01)
    Context. Very little is known about the polarimetric properties of CH stars and carbon-enhanced metal-poor (CEMP) stars, although many of these objects have been studied in detail both photometrically and spectroscopically. Aims. ...
  • Polarized line formation with J-state interference in the presence of magnetic fields: A Heuristic treatment of collisional frequency redistribution 
    Smitha, H. N; Nagendra, K. N; Sampoorna, M; Stenflo, J. O (Elsevier B.V., 2013-01)
    An expression for the partial frequency redistribution (PRD) matrix for line scattering in a two-term atom, which includes the J-state interference between its fine structure line components is derived. The influence of ...
  • Digitized archive of the Kodaikanal images: Representative results of Solar cycle variation from sunspot area determination 
    Ravindra, B; Priya, T. G; Amareswari, K; Priyal, M; Nazia, A. A; Banerjee, D (EDP Sciences, 2013-02)
    Photographic images are valuable data resources for studying long term changes in the solar magnetic field and its influence on the Earth's climate and weather. We digitized more than 100 years of white light images stored ...
  • Topological evolution and cosmic chaos 
    Tomaschitz, Roman (Elsevier, 1997-10)
    An account on the origins of cosmic chaos and its physical impact in an open and multiply connected universe is given. A new type of cosmic evolution by topological deformations, unpredicted by Einstein's equations, is ...

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