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Browsing by Author "Anupama, G. C"

Browsing by Author "Anupama, G. C"

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  • The Optical Spectrum of Nova Cygni 1992 
    Anupama, G. C; Prabhu, T. P (Institute of Physics Publishing, 1993)
    Spectroscopy of the ONeMg nova Cygni 1992 is presented, based on data obtained at the Vainu Bappu Observatory between 1992 March l3-May 22 and 1993 January 3. Spectra were obtained at five epochs- epoch I: 1992 March 13-14, ...
  • The optical spectrum of nova LW Serpentis 1978 
    Prabhu, T. P; Anupama, G. C (Kluwer Academic Publishers, 1987-03)
    Optical spectroscopic data of the nova LW Serpentis 1978, covering its diffuse-enhanced phase until the onset of the forbidden O I line flash, were obtained at the Vainu Bappu Observatory, Kavalur, between March 10 and ...
  • The optical spectrum of RS Ophiuchi 
    Anupama, G. C; Prabhu, P. B (VNU Science Press, 1987)
    The authors present optical Spectrophotometric observations obtained between 1985 February 27 and May 17, following the recent outburst of nova RS Ophiuchi. The photographic spectra cover the region 4300 - 8900 Å, at ...
  • Optical studies of a bright Type Iax supernova SN 2020rea 
    Singh, Mridweeka; Misra, Kuntal; Sahu, D. K; Ailawadhi, Bhavya; Dutta, Anirban; Howell, D. Andrew; Anupama, G. C; Bostroem, K. Azalee; Burke, Jamison; Dastidar, Raya; Gangopadhyay, Anjasha; Hiramatsu, Daichi; Im, Hyobin; McCully, Curtis; Pellegrino, Craig; Srivastav, Shubham; Teja, Rishabh Singh (Oxford University Press on behalf of Royal Astronomical Society, 2022-12)
    We present optical photometric and spectroscopic analysis of a Type Iax supernova (SN) 2020rea situated at the brighter luminosity end of Type Iax supernovae (SNe). The light curve decline rate of SN 2020rea is m15(g) = ...
  • 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 ...
  • Optical studies of SN 2009jf: a Type Ib supernova with an extremely slow decline and aspherical signature 
    Sahu, D. K; Gurugubelli, U. K; Anupama, G. C; Nomoto, K (Wiley-Blackwell, 2011-06)
    Optical UBVRI photometry and medium-resolution spectroscopy of the Type Ib supernova SN 2009jf, during the period from ∼ −15 to +250 d, with respect to the B maximum are reported. The light curves are broad, with an extremely ...
  • Optical Studies of the Low Velocity Gradient Type Ia Supernovae 2009an and 2009ig 
    Sahu, D. K; Anupama, G. C; Anto, P; Gurugubelli, U. K (Cambridge University Press, 2013-01)
    UBVRI photometry and medium resolution spectroscopy of two Type Ia supernovae, SN 2009an and SN 2009ig, are presented. Their Δm15(B) indicate these two SNe marginally deviate from “normal” Type Ia events. Spectroscopically, ...
  • Optical studies of two stripped envelope supernovae − SN 2015ap (Type Ib) and SN 2016P (Type Ic) 
    Gangopadhyay, A; Misra, K; Sahu, D. K; Wang, Shan-Qin; Kumar, Brajesh; Li, Long; Anupama, G. C; Dastidar, R; Elias-Rosa, N; Kumar, Brijesh; Singh, Mridweeka; Pandey, S. B; Sanwal, Pankaj; Singh, A; Srivastav, S; Tartaglia, L; Tomasella, L (Oxford University Press on behalf of the Royal Astronomical Society, 2020-09)
    We present the photometric and spectroscopic studies of a Type Ib SN 2015ap and a Type Ic SN 2016P. SN 2015ap is one of the bright (MV = −18.04 mag) Type Ib while SN 2016P lies at an average value among the Type Ic SNe (MV ...
  • Optical studies of Type IIb SN 2011dh 
    Sahu, D. K; Anupama, G. C; Chakradhari, N. K (Cambridge University Press, 2014-01)
    UBVRI photometry and low resolution optical spectroscopy of the type IIb SN 2011dh in M51 are presented, covering the first year after the explosion. The peak absolute magnitude in V-band of −17.12±0.18 mag indicates SN ...
  • Optical variability of radio-intermediate quasars 
    Goyal, Arti; Gopal-Krishna; Joshi, S; Sagar, R; Wiita, Paul J; Anupama, G. C; Sahu, D. K (Blackwell Publishing, 2010-02)
    We report the results of our intensive intranight optical monitoring of eight optically bright `radio-intermediate quasars' (RIQs) having flat or inverted radio spectra. The monitoring was carried out in R band on 25 nights ...
  • Outbursts of Comet 67P/Churyumov-Gerasimenko 
    Sharma, Kritti; Kelley, Michael S. P; Joharle, Simran; Kumar, Harsh; Swain, Vishwajeet; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu (IOP Publishing, 2021-12)
    We monitored the comet 67P/Churyumov-Gerasimenko close to its perihelion in November 2021 with the GROWTH-India Telescope. We observed two outbursts of this comet on 2021 October 29.940 and November 17.864 UTC, -3.12 days ...
  • The parent population of novae in the large magellanic cloud 
    Subramaniam, A; Anupama, G. C (American Institute of Physics, 2002)
    The parent population of novae in the Large Magellanic Cloud (LMC) are identified by a study of the local, projected, stellar populations. The age, density and luminosity function of the stellar population are estimated ...
  • The Peculiar Type Ia Supernova 2005hk 
    Stanishev, V; Taubenberger, S; Blanc, G; Anupama, G. C; Benetti, S; Cappellaro, E; Elias-Rosa, N; Féron, C; Goobar, A; Krisciunas, K; Pastorello, A; Sahu, D. K; Salvo, M. E; Schmidt, B. P; Sollerman, J; Thöne, C. C; Turatto, M; Hillebrandt, W (American Institute of Physics, 2007-08)
    We present a preliminary analysis of an extensive set of optical observations of the Type Ia SN 2005hk. We show that the evolution of SN 2005hk closely follows that of the peculiar SN 2002cx. SN 2005hk is more luminous ...
  • The Peculiar Type Ib Supernova 2006jc: A WCO Wolf-Rayet Star Explosion 
    Tominaga, N; Limongi, M; Suzuki, T; Tanaka, M; Nomoto, K; Maeda, K; Chieffi, A; Tornambe, A; Minezaki, T; Yoshii, Y; Sakon, I; Wada, T; Ohyama, Y; Tanabé, T; Kaneda, H; Onaka, T; Nozawa, T; Kozasa, T; Kawabata, K. S; Anupama, G. C; Sahu, D. K; Gurugubelli, U. K; Prabhu, T. P; Deng, J (The American Astronomical Society, 2008-11)
    ISM: Dust, Extinction, Infrared: ISM, Nuclear Reactions, Nucleosynthesis, Abundances, Stars: Supernovae: General, supernovae: individual (SN 2006jc), Stars: Wolf-Rayet We present a theoretical model for Type Ib supernova ...
  • The Peculiar Type Ib Supernova SN 2005bf: Explosion of a Massive He Star with a Thin Hydrogen Envelope? 
    Anupama, G. C; Sahu, D. K; Deng, J; Nomoto, K; Tominaga, N; Tanaka, M; Mazzali, P. A; Prabhu, T. P (University of Chicago Press, 2005-09)
    We present BVRI photometry and optical spectroscopy of SN 2005bf near maximum light. The maximum phase is broad and occurred around 2005 May 7, about 40 days after the shock breakout. SN 2005bf has a peak bolometric magnitude ...
  • Photoionization modelling of quiescence-phase spectra of novae and a symbiotic star 
    Mondal, Anindita; Das, Ramkrishna; Anupama, G. C; Mondal, Soumen (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)
    Using observed and published spectra in the optical region, we have studied a handful of novae and symbiotic stars that show novae-like variability in the quiescence phase. We present results for the novae ...
  • Photometric and spectroscopic evolution of supernova SN 2009an: another case of a transitional Type Ia event 
    Sahu, D. K; Anupama, G. C; Anto, P (Oxford University Press on behalf of the Royal Astronomical Society, 2013-04-01)
    We present optical UBVRI photometry and medium-resolution spectroscopy of a transitional Type Ia supernova, SN 2009an, over the period −6 to +150 d from the B maximum. With a Δm15(B) = 1.514 ± 0.132, SN 2009an declines ...
  • Photometric and spectroscopic evolution of the Type IIP supernova SN 2004et 
    Sahu, D. K; Anupama, G. C; Srividya, S; Muneer, S (Blackwell Publishing, 2006-09)
    We present optical photometry and spectroscopy of the Type IIP supernova SN 2004et that occurred in the nearby galaxy NGC 6946. The observations span a time range of 8–541 d after explosion. The late time bolometric ...
  • Photometric and spectroscopic evolution of type II-P supernova SN 2004A 
    Gurugubelli, U. K; Sahu, D. K; Anupama, G. C; Chakradhari, N. K (Astronomical Society of India, 2008-09)
    We present optical photometry and spectroscopy of the normal type IIP supernova SN2004A, which was discovered in the galaxy NGC 6207 on 2004 January 9.84UT. Early observations indicated that the supernova was discovered ...
  • Photometric and spectroscopic study of a highly reddened type Ia supernova SN 2003hx in NGC 2076 
    Misra, K; Sahu, D. K; Anupama, G. C; Pandey, K (Royal Astronomical Society, 2008-09)
    We present UBVRI CCD photometry and optical spectra of the type Ia supernova SN 2003hx which appeared in the galaxy NGC 2076, obtained till ∼ 146 d after the epoch of B-band maximum. The supernova reached at maximum ...

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