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Browsing by Author "Selvakumar, G"

Browsing by Author "Selvakumar, G"

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  • CCD observations of mutual events of Jovian satellites from VBO during 1997 
    Vasundhara, R; Chakraborty, P; Appakutty, M; Dinakaran, N; Ganeshan, M; Kuppuswamy, K; Moorthy, V; Muniyandi, A; Selvakumar, G; Velu, C; Ramana, K. V (Astronomical Society of India, 2001)
    CCD observations of the mutual events of the Galilean satellites of Jupiter from the Vainu Bappu Observatory during 1997 are presented. The derived times of close approach of the geometric centers of the satellites (satellite ...
  • Chemical composition of A–F type post-AGB candidates 
    Giridhar, S; Molina, R; Arellano Ferro, A; Selvakumar, G (Wiley-Blackwell, 2010-07)
    An abundance analysis has been conducted for a sample of nine post-AGB candidate stars; eight of them have not been explored before.We find four very promising objects like HD 105262, HD 53300 and CpD−62o5428 among them. ...
  • Clustering of low-mass stars around Herbig Be star IL Cep – evidence of ‘Rocket Effect’ using Gaia EDR3 ? 
    Arun, R; Mathew, B; Maheswar, G; Baug, Tapas; Kartha, S. S; Selvakumar, G; Manoj, P; Shridharan, B; Anusha, R; Narang, Mayank (Oxford University Press on behalf of the Royal Astronomical Society, 2021-10)
    We study the formation and the kinematic evolution of the early-type Herbig Be star IL Cep and its environment. The young star is a member of the Cep OB3 association, at a distance of 798 ± 9 pc, and has a ‘cavity’ ...
  • Decoding the X-Ray Flare from MAXI J0709–159 Using Optical Spectroscopy and Multiepoch Photometry 
    Bhattacharyya, Suman; Mathew, Blesson; Ezhikode, Savithri H; Muneer, S; Selvakumar, G; Maheswar, G; Arun, R; Anilkumar, Hema; Banerjee, Gourav; Kumar, S. P; Kartha, Sreeja S; Paul, KT; Velu, C (IOP Publishing, 2022-07-10)
    We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/Gas Slit Camera observations in soft and hard X-rays from MAXI J0709–159 in the direction of HD 54786 (LY CMa), on 2022 January 25. ...
  • Detection of additional absorption in the post-outburst spectra of MU Centauri 
    Ghosh, K. K; Kuppuswamy, K; Pukalenthi, S; Selvakumar, G (The American Astronomical Society, 1991-09)
    A large number of photographic (92) and CCD (27) spectra of the pole-on Be star, Mu Cen, were obtained between February 1987 and May 1990. From the results of the above-mentioned spectra a weak outburst was detected in ...
  • Identification of metal-poor stars using the artificial neural network 
    Giridhar, S; Goswami, A; Kunder, A; Muneer, S; Selvakumar, G (EDP Sciences, 2013-08)
    Context. Identification of metal-poor stars among field stars is extremely useful for studying the structure and evolution of the Galaxy and of external galaxies. Aims. We search for metal-poor stars using the artificial ...
  • Nova Herculis 1991 
    Iijima, T; Gehrz, R. D; Jones, T. J; Lawrence, G; Sivaraman, K. R; Prabhu, T. P; Ghosh, K. K; Anupama, G. C; Selvakumar, G (Smithsonian Astrophysical Observatory, 1991-04)
  • Observing conditions for optical astronomy at Leh 
    Singh, J; Bhattacharyya, J. C; Babu, G. S. D; Ashoka, B. N; Appakutty, M; Rangarajan, K. E; Kutty, K. N; Moorthy, V; Selvakumar, G; Michael, P; Muniyandi, A; Gabriel, F (Astronomical Society of India, 1989-09)
    The sky and atmospheric conditions at Leh have been monitored since 1984 with a view to determining its suitability as a site for a high-altitude observatory. During May-November, 1987, relative humidity and other parameters ...
  • Optical spectroscopic and polarization properties of 2011 outburst of the recurrent nova T Pyxidis 
    Pavana, M; Ramya, M. Anche; Anupama, G. C; Ramaprakash, A. N; Selvakumar, G (EDP Sciences, 2019-02)
    Aims. We aim to study the spectroscopic and ionized structural evolution of T Pyx during its 2011 outburst, and also study the variation in degree of polarization during its early phase. Methods. Optical spectroscopic data ...
  • 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 ...
  • The PHEMU03 catalogue of observations of the mutual phenomena of the Galilean satellites of Jupiter 
    Arlot, J. E; Thuillot, W; Ruatti, C; Ahmad, A; Amosse, A; Anbazhagan, P; Andreyev, M; Antov, A; Appakutty, M; Aubry, S; Asher, D; Spampinato, S. A; Stellmacher, I; Trunkovsky, E; Tejfel, V; Tudose, V; Turcu, V; Ugarte, I; Vantyghem, P; Vasundhara, R; Vaubaillon, J; Baron, N; Velu, C; Venkataramana, A. K; Vidal Sãinz, J; Vienne, A; Vilar, J; Vingerhoets, P; Vollman, W; Bassiere, N; Berthe, M; Bogdanovski, R; Bosq, F; Bredner, E; Buettner, D; Buromsky, M; Cammarata, S; Casas, R; Chis, G. D; Christou, A. A; Coquerel, J. P; Corlan, R; Cremaschini, C; Crussaire, D; Cuypers, J; Dennefeld, M; Descamps, P; Devyatkin, A; Dimitrov, D; Dorokhova, T. N; Dorokhov, N. I; Dourneau, G; Dueñas, M; Dumitrescu, A; Emelianov, N; Ferrara, D; Fiel, D; Fienga, A; Flatres, T; Foglia, S; Garlitz, J; Gerbos, J; Gilbert, R; Goncalves, R. M. D; Gonzales, D; Gorda, S. Y; Gorshanov, D. L; Hansen, M. W; Harrington, M; Irsmambetova, T. R; Ito, Y; Ivanova, V; Izmailov, I. S; Khovritchev, M. Y; Khrutskaya, E. V; Kieken, J; Kiseleva, T. P; Kuppuswamy, K; Lainey, V; Lavayssiere, M; Lazzarotti, P; Le Campion, J. F; Lellouch, E; Li, Z. L; Lo Savio, E; Lou, M; Magny, E; Manek, J; Marinello, W; Marino, G; McAuliffe, J. P; Michelli, M; Moldovan, D; Montagnac, S; Moorthy, V; Nickel, O; Nier, J. M; Noel, T; Noyelles, B; Oksanen, A; Parrat, D; Pauwels, T; Priban, V; Ramachandran, B; Rambaux, N; Rapaport, M; Rapavy, P; Rau, G; Sacre, J. J; Sada, P. V; Salvaggio, F; Sarlin, P; Sciuto, C; Selvakumar, G; Sergeyev, A; Sidorov, M; Sorescu, S (EDP Sciences, 2009-01)
    Context: In 2003, the Sun and the Earth passed through both the equatorial plane of Jupiter and therefore the orbital planes of its main satellites. Aims: During this period, mutual eclipses and occultations were observed ...
  • The PHEMU15 catalogue and astrometric results of the Jupiter's Galilean satellite mutual occultation and eclipse observations made in 2014-2015 
    Saquet, E; Emelyanov, N; Robert, V; Arlot, J. -E; Anbazhagan, P; Baillie, K; Bardecker, J; Berezhnoy, A. A; Bretton, M; Campos, F; Capannoli, L; Pomazan, A; Popescu, M; Pratt, A; Raskhozhev, V. N; Resch, J.-M; Robilliard, D; Roschina, E; Rothenberg, E; Rottenborn, M; Rusov, S. A; Talbot, J; Saby, F; Saya, L. F; Selvakumar, G; Signoret, F; Slesarenko, V. Y; Sokov, E. N; Soldateschi, J; Sonka, A; Soulie, G; Tejfel, V. G; Thuillot, W; Timerson, B; Toma, R; Torsellini, S; Trabuco, L. L; Traverse, P; Tsamis, V; Unwin, M; Carry, B; Van Den Abbeel, F; Vandenbruaene, H; Vasundhara, R; Velikodsky, Y. I; Vienne, A; Vilar, J; Vugnon, J. -M; Wuensche, N; Zeleny, P; Castet, M; Charbonnier, Y; Chernikov, M. M; Christou, A; Colas, F; Coliac, J. -F; Dangl, G; Dechambre, O; Delcroix, M; Dias-Oliveira, A; Drillaud, C; Duchemin, Y; Dunford, R; Ellington, C; Fabre, P; Filippov, V. A; Finnegan, J; Foglia, S; Font, D; Gaillard, B; Galli, G; Garlitz, J; Gasmi, A; Gaspar, H. S; Gault, D; Gazeas, K; George, T; Gorda, S. Y; Gorshanov, D. L; Gualdoni, C; Guhl, K; Halir, K; Hanna, W; Henry, X; Herald, D; Houdin, G; Ito, Y; Izmailov, I. S; Jacobsen, J; Jones, A; Kamoun, S; Kardasis, E; Karimov, A. M; Khovritchev, M. Y; Kulikova, A. M; Laborde, J; Lainey, V; Lavayssiere, M; Guen, P. Le; Leroy, A; Loader, B; Lopez, O. C; Lyashenko, A. Y; Lyssenko, P. G; Machado, D. I; Maigurova, N; Manek, J; Marchini, A; Midavaine, T; Montier, J; Morgado, B. E; Naumov, K. N; Nedelcu, A; Newman, J; Ohlert, J. M; Oksanen, A; Pavlov, H; Petrescu, E (Oxford University Press on behalf of the Royal Astronomical Society, 2018-03)
    During the 2014–2015 mutual events season, the Institut de M ́ ecanique C ́ eleste et de Calcul des ́ Eph ́ em ́ erides (IMCCE), Paris, France, and the Sternberg Astronomical Institute (SAI), Moscow, Russia, ...
  • The PHEMU21 catalogue and astrometric results of the observations of the mutual occultations and eclipses of the Galilean satellites of Jupiter made in 2021 
    Emelyanov, N; Arlot, J-E; Anbazhagan, P; Andre, P; Bardecker, J; Canaud, G; Coliac, J. F; De Elias Cantalapiedra, J; Ellington, C. K; Fernandez, J. M; Forbes, M; Gazeas, K; Gault, D; George, T; Gourdon, F; Herald, D; Huber, D; Iglesias-Marzoa, R; Izquierdo, J; Jorba Lloveras, R; Kerr, S; Lasala, A; Le Guen, P; Leroy, A; Lutz, M; Maley, P; Mannchen, T; Mari, J. M; Maury, A; Newman, J; Palafouta, S; Prieto Gallego, J; Roger, P; Roschli, D; Selvakumar, G; Serra, V; Stuart, P; Turchenko, M; Vasundhara, R; Velasco, E (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    2021 wasthe year ofJupiter’s equinox, that isthe Sun and the Earth passed through the equatorial plane of the planet and therefore the orbital planes of its main satellites. This occurrence made it possible to observe ...
  • Spectroscopic and geometrical evolution of the ejecta of the classical nova ASASSN-18fv 
    Pavana, M; Raj, A; Bohlsen, T; Anupama, G. C; Gupta, R; Selvakumar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2020-05)
    The optical spectroscopic observations of ASASSN-18fv observed from 2018 March 24 to 2019 January 26 are presented. The optical spectra are obtained from Mirranook, Vainu Bappu, and South African Astronomical observatories. ...
  • Spectroscopic and geometrical evolution of the ejecta of the classical nova ASASSN-18fv 
    Pavana, M; Raj, A; Bohlsen, T; Anupama, G. C; Gupta, R; Selvakumar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2020-06)
    The optical spectroscopic observations of ASASSN-18fv observed from 2018 March 24 to 2019 January 26 are presented. The optical spectra are obtained from Mirranook, Vainu Bappu, and South African Astronomical observatories. ...
  • The stellar parametrization using Artificial Neural Network 
    Giridhar, S; Goswami, A; Kunder, A; Muneer, S; Selvakumar, G (Astronomical Society of India, 2012)
    An update on recent methods for automated stellar parametrization is given. We present preliminary results of the ongoing program for rapid parametrization of field stars using medium resolution spectra obtained using Vainu ...

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