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Browsing Publications of Astronomical Society of India by Author "Ashok, N. M"

Browsing Publications of Astronomical Society of India by Author "Ashok, N. M"

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  • CCD imaging of Jupiter during its impact with Comet Shoemaker-Levy 9 : Observations from Jaisalmer 
    Tej, A; Chandrasekhar, T; Ashok, N. M; Ragland, S; Mathur, S. N; Jain, J (Astronomical Society of India, 1996)
    CCD imaging observations of Jupiter were carried out, from the desert location of Jaisalmer in Rajasthan, during the period of its collision with the comet Shoemaker-Levy 9. A Celestron 8 telescope was used with a Lynx PC ...
  • Coronal Interferogram in 5303A Obtained During Total Solar Eclipse of February 16, 1980 and Coronal Temperatures 
    Chandrasekhar, T; Ashok, N. M; Desai, J. N; Vaidya, D. B; Angreji, P. D (Tata Institute of Fundamental Research, Bombay, 1980-06)
    Coronal interferogram in 5303 Armstrong was obtained during the total solar eclipse of February 16, 1980 using Fabry-Perot etalon. Coronal temperatures determined from the Doppler width of the fringes are reported and ...
  • Detection of circumstellar dust shell around supergiant TV GEM from milliarcsecond resolution near infrared observations 
    Ragland, S; Chandrasekhar, T; Ashok, N. M (Astronomical Society of India, 1996)
    The M1 supergiant TV Gem has been observed at 2.2 µm by lunar occultation technique. The central star has been resolved from our observatins. We have also detected the circumstellar dust envelope around this star from our ...
  • A Different Kind of Burst From Infrared/X-Ray Burster Liller I/MXB 1730-333 
    Ashok, N. M; Kulkarni, P. V (Astronomical Society of India, 1979-06)
    Double enhancement or burst of entirely different kind observed in K band from the source Liller I/MXB 1730-333 is reported.
  • Imaging Fabry-Perot observations of green coronal line during the total solar eclipse of 21 June 2001 
    Chandrasekhar, T; Ashok, N. M; Anandarao, B. G (Astronomical Society of India, 2002-09)
    A Fabry-Perot interferometric experiment on the Green Coronal line was successfully performed during the total solar eclipse of 21 June 2001 from Lusaka, Zambia. Use of a cooled CCD camera permitted 17 separate exposures ...
  • Infrared study of the first identified helium nova V445 Puppis 
    Ashok, N. M (Astronomical Society of India, 2005-06)
    The eruptive variable V445 Puppis has been proposed by us as the first observed Helium nova. The absence of hydrogen lines in the early optical spectra showed the peculiar nature of this object. We have observed V445 Pup ...
  • IR observations of Am stars 
    Shylaja, B. S; Ashok, N. M (Astronomical Society of India, 2002)
    The IR observations of chemically peculiar stars are carried out and compared with the previous data in IR and far IR from IRAS. The flux redistribution appears to be a common phenomenon in all the stars of this class. The ...
  • IR Spectroscopy of Nova-like Sources 
    Banerjee, D. P. K; Ashok, N. M (Astronomical Society of India, 2003)
    Near - IR spectroscopic and photometric observations of the eruptive variables V838 Mon and V445 Puppis in the J H K bands are reported. These objects erupted in nova-like explosions but evolved into rather unique and ...
  • Is HR 2947 a variable? 
    Kameswara Rao, N; Ashok, N. M; Kulkarni, P. V (Astronomical Society of India, 1981-06)
    Observations of HR 2947 show that it is fainter by 0.3 mag in V compared to the magnitude listed by Cowley et al. (1969). The energy distribution from 1565 Armstrong to 1.25 micro is similar to that of a B5 III star and ...
  • JHK Spectroscopy of the Enigmatic Variable V445 Puppis 
    Ashok, N. M; Banerjee, D. P. K (Astronomical Society of India, 2003)
    Near-IR spectroscopic observations are reported for the enigmatic, nova-like, variable V445 Puppis. The near-IR spectra are hydrogen-deficient and unusually rich in CI lines. The spectra indicate that the object could be ...
  • Limited Seeing Measurements at Mount Abu Infrared Observatory 
    Ashok, N. M; Banerjee, D. P. K (Astronomical Society of India, 2002-12)
    Measurements of atmospheric seeing for the Mount Abu Infrared Observatory, Gurusikhar are presented. Observations made with a differential image motion monitor, between 6 December 1999 to 28 April 2000, give an ...
  • Near infrared coronal line emission in nova Herculis 1991 
    Chandrasekhar, T; Ashok, N. M; Ragland, S (Astronomical Society of India, 1993)
    Near infrared coronal line emission at 1.98 +/- 0.02 micrometers due to (Si VI) detected in the spectrum of Nova Herculis 1991 as early as about 17 days after optical maximum is reported. The coronal line observations ...
  • Near infrared high angular resolution observations of stars and circumstellar regions by the technique of lunar occultations 
    Chandrasekhar, T; Ashok, N. M; Sam Ragland (Astronomical Society of India, 1993)
    A program of high angular resolution observations of stars and their circumstellar regions using the technique of lunar occultations has been initiated at the Physical Research Laboratory, Ahmedabad. A liquid nitrogen ...
  • Near infrared photometry of unassociated IRAS point sources in the zodiacal belt 
    Ashok, N. M; Chandrasekhar, T; Ragland, S; Watson, P. V (Astronomical Society of India, 1993)
    An observational program to generate a list of bright near infrared sources using IRAS Point Source Catalogue for further studies using lunar occultation technique has been initiated at Physical Research Laboratory, ...
  • 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 ...
  • Near-infrared spectroscopy of nova Sagittarii 1998 
    Ashok, N. M; Chandrasekhar, T (Astronomical Society of India, 2000)
    Near-infrared spectra of Fe-II type nova, Nova Sagittarii 1998 obtained during the period 30 to 70 days after the discovery date are presented. The near infrared spectrum is dominated by emission lines of hydrogen and ...
  • Near-infrared spectroscopy of Nova Sagittarii 2001 (V4643 Sgr) 
    Ashok, N. M; Banerjee, D. P. K; Varricatt, W. P (Astronomical Society of India, 2002-09)
    Near-infrared spectra of the very fast ReiN-type nova, Nova Sagittarii 2001 (V464a Sgr) obtained in the early decline phase and the period 110 to 170 days after the discovery date are presented. The spectrum in the early ...
  • A near-IR stellar spectral library in the H band using the Mt. Abu telescope 
    Gupta, R; Ashok, N. M; Singh, H. P; Ranade, A. C (Astronomical Society of India, 2005-06)
    We present an H band near-infrared (NIR) spectral library of 135 solar type stars covering spectral types O5-M3 and luminosity classes I-V as per MK classification. The observations were carried out with 1.2 meter Gurushikhar ...
  • 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 ...
  • A two channel high speed photometer for lunar occultation studies in the near - IR 
    Mondal, S; Chandrasekhar, T; Ashok, N. M; Kikani, P. K (Astronomical Society of India, 1999)
    Lunar occultaion in the near infrared has been demonstrated by the PRL group to be an effective method of determining the angular size (in milliarcsecond range)and accurate effective temperature of red giants, supergiants ...

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