IIA Institutional Repository

Browsing by Author "Kamath, U. S"

Browsing by Author "Kamath, U. S"

Sort by: Order: Results:

  • Filters for NIR astronomical photometry: comparison of commercial IRWG filters and designs using OpenFilters 
    Mishra, Anwesh Kumar; Kamath, U. S (Indian Academy of Sciences, 2022-06)
    The photometric accuracy in the near-infrared (NIR) wavelength range (0.9–2.6 lm) is strongly affected by the variability of atmospheric transmission. The Infrared Working Group (IRWG) has recommended filters that help ...
  • Geometry of nova ejecta 
    Pavana, M; Anupama, G. C; Ramya, M. Anche; Kamath, U. S; Selva Kumar, G (Cambridge University Press, 2020)
    We present photo-ionization and morpho-kinematic analyses of the ejecta of novae. The sample consists of ten novae belonging to the Fe II, He/N and hybrid classes. The Fe II class of novae in the sample have bipolar cone-like ...
  • Interstellar medium and star formation studies with the square kilometre array 
    Manoj, P; Vig, S; Maheswar, G; Kamath, U. S (Indian Academy of Sciences, 2016-12)
    Stars and planetary systems are formed out of molecular clouds in the interstellar medium. Although the sequence of steps involved in star formation are generally known, a comprehensive theory which describes the details ...
  • IR-IMAC - A developmental approach 
    Vidhya, V; Kamath, U. S; Vidhya, R (Astronomical Society of India, 2004-03)
    IR-IMAC is a multi-utility software package developed to remotely control the Near-Infrared imager installed on the 2-metre Himalayan Chandra Telescope at Mt. Saraswati, Hanle. The core idea in the development of IR-IMAC ...
  • Near Infrared Observations of Sakurai's Object during 1998-99 
    Kamath, U. S; Ashok, N. M (Springer, 2002-03)
    We present new near-infrared observations of Sakurai's Object obtained during 1998-99 when this final helium shell flash object was in the dust condensation phase. The infrared colours have reddened compared to earlier ...
  • Near-infrared and optical studies of the fast nova V4643 Sgr (Nova Sagittarii 2001) 
    Ashok, N. M; Banerjee, D. P. K; Varricatt, W. P; Kamath, U. S (Blackwell Publishing, 2006-05)
    V4643 Sagittarii or Nova Sagittarii 2001 was discovered in outburst at 7.7 mag on 2001 February 24. Here, we present near-infrared results of this fast classical nova obtained in the early decline phase in 2001 March ...
  • Near-infrared observations of nova Aquilae 1995 
    Kamath, U. S; Ashok, N. M; Chandrasekhar, T (Astronomical Society of India, 1996)
    JHK photometry of the slow, Fe-II type nova- Nova Aquilae 1995- obtained at the 1.2m Gurushikhar Infrared Telescope (GIRT) is presented here. Evidence for the presence of dust in the nova ejected based on these observations ...
  • A near-infrared photometer for the 1-m telescope of Vainu Bappu Observatory 
    Mishra, Anwesh Kumar; Kamath, U. S (Indian Academy of Sciences, 2021-04)
    A near-infrared photometer based on an InGaAs PIN photodiode and the filter set recommended by Infrared Working Group (IRWG) have been designed and built. It is mounted on the 1-m Carl–Zeiss telescope at the Vainu Bappu ...
  • Near-Infrared Spectra of Some Symbiotic Stars 
    Kamath, U. S; Ashok, N. M (Astronomical Society of the Pacific, 2003)
  • Nova V4444 Sagittarii 1999 in the early decline and quiescent phases 
    Kamath, U. S; Ashok, N. M; Anupama, G. C (Astronomical Society of India, 2008-12)
    We present near-infrared and optical spectra of the fast nova V4444 Sagittarii at two single epochs in the early decline phase and unfiltered images obtained in quiescence. Based on this and other available data, we discuss ...
  • Optical and near-infrared spectroscopy of nova V1494 Aquilae 1999 no. 2 
    Kamath, U. S; Anupama, G. C; Ashok, N. M; Mayya, Y. D; Sahu, D. K (Monthly Notices of the Royal Astronomical Society, Vol. 361, No. 4, pp. 1165 - 1172, 2005-08)
    Optical and near-infrared spectroscopic observations of the fast nova V1494 Aquilae 1999 no. 2 covering various phases - early decline, transition and nebular - during the first 18 months of its post-outburst evolution are ...
  • Optical Spectroscopy of GK Persei during outburst and quiescence 
    Kamath, U. S; Anupama, G. C (American Institute of Physics, 2002)
    We present here the optical spectra of Gk Persei obtained during 1995 – 2001. This period includes two dwarf-nova outbursts and the quiescence phases.
  • Optical Spectroscopy of the nova-like variable V 445 Puppis 
    Kamath, U. S; Anupama, G. C (Astronomical Society of India, 2002-09)
    V445 Puppis is a peculiar variable which had a nova-like eruption in December 2000. The early spectra did not show any emission lines of hydrogen or helium. Fe II lines were very dominant during this phase. We present optical ...
  • Optical Spectroscopy of the Recurrent Nova RS Ophiuchi - from the Outburst of 2006 to Quiescence 
    Mondal, Anindita; Anupama, G. C; Kamath, U. S; Das, Ramkrishna; Selvakumar, G; Mondal, Soumen (Oxford University Press on behalf of the Royal Astronomical Society, 2018-03)
    Optical spectra of the 2006 outburst of RS Ophiuchi beginning one day after discovery to over a year after the outburst are presented here. The spectral evolution is found to be similar to that in previous outbursts. The ...
  • 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 ...
  • Post-Maximum Optical and Infrared Observations of Nova V1425 Aquilae 1995 
    Kamath, U. S; Anupama, G. C; Ashok, N. M; Chandrasekhar, T (American Astronomical Society, 1997-12)
    We present the post-maximum optical spectroscopy and infrared photometry of Nova V1425 Aquilae 1995. The data indicate that the nova belongs to the Fe ii class and that it formed an optically thin dust shell at a very early ...
  • Recovery of quiescent novae 
    Kamath, U. S (Astronomical Society of the Pacific, 2009)
    An observational program of recovery and study of quiescent novae is being carried out at the 2m Himalayan Chandra Telescope (HCT) of the Indian Institute of Astrophysics (IIA) since 2004. Some results from this survey are ...
  • SDSS J123813.73-033933.0: a cataclysmic variable evolved beyond the period minimum 
    Aviles, A; Zharikov, S; Tovmassian, G; Michel, R; Tapia, M; Roth, M; Neustroev, V; Zurita, C; Andreev, M; Sergeev, A; Pavlenko, E; Tsymbal, V; Anupama, G. C; Kamath, U. S; Sahu, D. K (Institute of Physics, 2010-03)
    We present infrared JHK photometry of the cataclysmic variable (CV) SDSS J123813.73 – 033933.0 and analyze it along with optical spectroscopy, demonstrating that the binary system is most probably comprised of a massive ...
  • Shock-driven synchrotron radio emission from the 2021 outburst of RS Ophiuchi 
    Nayana, A. J; Anupama, G. C; Roy, Nirupam; Banerjee, Dipankar P. K; Singh, Kulinder Pal; Sonith, L. S; Kamath, U. S (Oxford University Press on behalf of Royal Astronomical Society, 2024-03)
    We present low-frequency radio observations of the Galactic symbiotic recurrent nova RS Ophiuchi during its 2021 outburst. The observations were carried out with the upgraded Giant Metrewave Radio Telescope spanning a ...
  • Soft X-ray and FUV observations of Nova Her 2021 (V1674 Her) with AstroSat 
    Bhargava, Yash; Dewangan, Gulab Chand; Anupama, G. C; Kamath, U. S; Sonith, L. S; Singh, Kulinder Pal; Drake, J. J; Beardmore, A; Luna, G. J. M; Orio, M; Page, K. L (Published by Oxford University Press on behalf of Royal Astronomical Society, 2024-02)
    Nova Her 2021 or V1674 Her was one of the fastest novae to be observed so far. We report here the results from our timing and spectral studies of the source observed at multiple epochs with AstroSat. We report the detection ...

Search DSpace

Browse

My Account