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Browsing IIAP Publications by Author "Ashok, N. M"

Browsing IIAP Publications by Author "Ashok, N. M"

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  • Analysis of Coronal Green Line Profiles: Evidence of Excess Blueshifts 
    Raju, K. P; Chandrasekhar, T; Ashok, N. M (IOP Publishing, 2011-08-01)
    Coronal green line (Fe XIV 5303 Å) profiles were obtained from Fabry-Perot interferometric observations of the solar corona during the total solar eclipse of 2001 June 21 from Lusaka, Zambia. The instrumental width is about ...
  • Are DY Persei Stars Cooler Cousins of R Coronae Borealis Stars? 
    Bhowmick, A; Pandey, G; Joshi, V; Ashok, N. M (IOP Publishing, 2018-02)
    Are DY Persei Stars Cooler Cousins of R Coronae Borealis Stars? Anirban Bhowmick 1 , Gajendra Pandey 1 , Vishal Joshi 2 , and N. M. Ashok 2 1 Indian Institute of Astrophysics, Koramangala, Bengaluru 560 034, ...
  • Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 
    Sicardy, B; Tej, A; Gomes-Júnior, A. R; Romanov, F. D; Bertrand, T; Ashok, N. M; Lellouch, E; Morgado, B. E; Assafin, M; Desmars, J; Camargo, J. I. B; Kilic, Y; Ortiz, J. L; Vieira-Martins, R; Braga-Ribas, F; Ninan, J. P; Bhatt, B. C; Pramod Kumar, S; Swain, V; Sharma, S; Saha, A; Ojha, D. K; Pawar, G; Deshmukh, S; Deshpande, A; Ganesh, S; Jain, J. K; Mathew, S. K; Kumar, H; Bhalerao, V; Anupama, G. C; Barway, Sudhanshu; Brandeker, A; Floren, H. G; Olofsson, G; Bruno, G; Mao, Y. M; Ye, R. H; Zou, Q. Y; Sun, Y. K; Shen, Y. Y; Zhao, J. Y; Grishin, D. N; Romanova, L. V; Marchis, F; Fukui, K; Kukita, R; Benedetti-Rossi, G; Santos-Sanz, P; Dhyani, N; Gokhale, A; Kate, A (EDP Sciences, 2024-02)
    Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the ...
  • An Evolved Disk Surrounding the Massive Main-Sequence Star MWC 297? 
    Manoj, P; Ho, P. T. P; Ohashi, N; Zhang, Q; Hasegawa, T; Chen, H - R; Bhatt, H. C; Ashok, N. M (University of Chicago Press, 2007-10)
    We present the results of the interferometric observations of the circumstellar disk surrounding MWC 297 in the continuum at 230 GHz (1.3 mm) and in the () rotational transitions of 12CO,13CO, and C18O using the Submillimeter ...
  • Fabry-Perot interferometric observations of the coronal red and green lines during the 1983 Indonesian eclipse 
    Chandrasekhar, T; Ashok, N. M; Desai, J. N; Pasachoff, J. M; Sivaraman, K. R (Optical society of America, 1984-02)
    A dual-channel Fabry-Perot interferometric system was used to study simultaneously the coronal emission lines at 5303 Å (Fe XIV) and at 6374 Å (Fe X). Initial results indicate an emission corona confined largely within 1.2 ...
  • High-resolution studies of forbidden O I and NH2 line emissions at 6300 A in Halley's comet 
    Prasad, C. D; Chandrasekhar, T; Desai, J. N; Ashok, N. M; Sivaraman, K. R; Rajmohan, R (Astronomical Society of the Pacific, 1988-06)
    The forbidden O I line and NH2 (0-8-0) emissions of Comet Halley at about 6300 A were observed during April 1986 using a Fabry-Perot spectrometer with a resolution of about 0.14 A. The forbidden O I line and NH2 rotational ...
  • Insights into the evolution of symbiotic recurrent novae from radio synchrotron emission: V745 Scorpii and RS Ophiuchi 
    Kantharia, N. G; Dutta, P; Roy, N; Anupama, G. C; Ishwara-Chandra, C. H; Chitale, A; Prabhu, T. P; Banerjee, D. P. K; Ashok, N. M (Oxford University Press on behalf of the Royal Astronomical Society, 2016-02)
    We present observations at 610 and 235 MHz using the Giant Metrewave Radio Telescope (GMRT) of the recurrent nova V745 Scorpii which recorded its last outburst on 2014 February 6. This is the second symbiotic recurrent ...
  • Modelling the synchrotron light curves in recurrent novae V745 Scorpii and RS Ophiuchi 
    Kantharia, N. G; Dutta, P; Roy, N; Anupama, G. C; Chitale, A; Ishwara-Chandra, C; Prabhu, T. P; Ashok, N. M; Banerjee, D. P. K (Astronomical Society of India, 2015-02)
    In this paper, we present the synchrotron light curve at 610 MHz from the recurrent nova V745 Sco following its outburst on 6 February 2014. The system has been detected and periodically monitored with the Giant Metrewave ...
  • 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 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 interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley 
    Prasad, D. C; Chandrasekhar, T; Desai, J. N; Ashok, N. M; Krishan, V (Indian Academy of Sciences, 1989-03)
    During the recent apparition of Comet Halley in 1985-86, a transient ionic event in the form of a blob of H2O(+) emission was recorded in the coma at about 0 h UT on March 13, 1986. Observations were carried out using a ...
  • Optical Studies of V4332 Sagittarii: Detection of Unusually Strong K I and Na I Lines in Emission 
    Banerjee, D. P. K; Ashok, N. M (University of Chicago Press, 2004)
    We present optical observations of the enigmatic nova-like variable V4332 Sgr. The importance of this object should not be understated since it is considered to be the possible prototype of a new class of eruptive variables. ...
  • Optical/IR studies of Be stars in NGC 6834 with emphasis on two specific stars 
    Mathew, B; Varricatt, W. P; Subramaniam, A; Ashok, N. M; Banerjee, D. P. K (IOP Publishing, 2014-09)
  • Photometry of the solar corona during total solar eclipse of October 24, 1995 
    Ananda Rao, B. G; Ashok, N. M; Chandrasekhar, T; Desai, J. N; Nanda Kumar, M. S (Indian Institute of Astrophysics, 1997)
    White light pictures and filter grams in three narrow band interference filters centered on the emission lines In Fe X, Fe XIV and Ca XV have been obtained. We have observed a coronal structure towards the north western ...
  • 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 ...
  • SAO 75669: A late type giant behind the molecular cloud MBM 12 
    Bhatt, H. C; Sagar, R; Subramaniam, A; Gorti, U; Chandrasekhar, T; Ashok, N. M; Ragland, S (European Southern Observatory, 1994-09)
    Photometric and spectroscopic observations of the star SAO 75669 in the region of the high galactic latitude molecular cloud MBM 12 are presented. The optical, near-infrared and far-infrared IRAS photometric magnitudes ...
  • Spectroscopic studies of the solar corona during total solar eclipse of October 24, 1995 
    Ananda Rao, B. G; Ashok, N. M; Chandrasekhar, T; Desai, J. N; Nanda Kumar, M. S (Indian Institute of Astrophysics, 1997)
    We have obtained Fabry-Perot Interferograms of the solar corona during the 1995 total solar eclipse, in two emission lines, Fe X line at 6374Å and Fe XIV line at s303 Å. We have also obtained a Fabry-perot-gram of the ...

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