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Browsing Publications based on data from IAO, Hanle by Title

Browsing Publications based on data from IAO, Hanle by Title

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  • Star formation in blue compact dwarf galaxies: Mkn 104 and I Zw 97 
    Ramya, S; Sahu, D. K; Prabhu, T. P (Blackwell Publishing, 2009-06)
    Two blue compact dwarf galaxies, Mkn 104 and I Zw 97, are studied photometrically and spectroscopically. Mkn 104 is found to contain three distinct bright star-forming regions, whereas I Zw 97 is found to contain three ...
  • Star formation in bulgeless late-type galaxies: clues to their evolution 
    Mousumi Das; Sengupta, C; Ramya, S; Misra, K (Wiley-Blackwell, 2012-07)
    We present Giant Meterwave Radio Telescope 1280-MHz radio continuum observations and follow-up optical studies of the disc and nuclear star formation in a sample of low-luminosity bulgeless galaxies. The main aim is to ...
  • Stardust-NExT, Deep Impact, and the accelerating spin of 9P/Tempel 1 
    Belton, M. J. S; Meech, K. J; Chesley, S; PittichovĆ, J; Carcich, B; Drahus, M; Harris, A; Gillam, S; Veverka, J; Mastrodemos, N; Owen, W; A’Hearn, M. F; Bagnulo, S; Bai, J; Barrera, L; Bastien, F; Bauer, J. M; Bedient, J; Bhatt, B. C; Boehnhardt, H; Brosch, N; Buie, M; Candia, P; Chen, W; Chiang, P; Choi, Y; Cochran, A; Crockett, C. J; Duddy, S; Farnham, T; Fernández, Y. R; Gutiérrez, P; Hainaut, O. R; Hampton, D; Herrmann, K. A; Hsieh, H; Kadooka, M. A; Kaluna, H; Keane, J; Kim, M; Klaasen, K; Kleyna, J; Krisciunas, K; Lara, L. M; Lauer, T. R; Li, J; Licandro, J; Lisse, C. M; Lowry, S. C; McFadden, L; Moskovitz, N; Mueller, B; Polishook, D; Raja, N. S; Riesen, T; Sahu, D. K; Samarasinha, N; Sarid, G; Sekiguchi, T; Sonnett, S; Suntzeff, N. B; Taylor, B. W; Thomas, P; Tozzi, G. P; Vasundhara, R; Vincent, J; Wasserman, L. H; Webster-Schultz, B; Yang, B; Zenn, T; Zhao, H (Elsevier B.V., 2011-05)
    The evolution of the spin rate of Comet 9P/Tempel 1 through two perihelion passages (in 2000 and 2005) is determined from 1922 Earth-based observations taken over a period of 13 year as part of a World-Wide observing ...
  • Stars at the Tip of Peculiar Elephant Trunk-Like Clouds in IC 1848E: A Possible Third Mechanism of Triggered Star Formation 
    Chauhan, N; Ogura, K; Pandey, A. K; Samal, M. R; Bhatt, B. C (Astronomical Society of Japan, 2011-08)
    The H II region IC 1848 harbors a lot of intricate elephant trunk-like structures that look morphologically different from usual bright-rimmed clouds (BRCs). Of particular interest is a concentration of thin and long ...
  • Status of HAGAR, the high altitude gamma ray observatory at Hanle 
    Chitnis, V. R; Acharya, B. S; Bhat, P. N; Cowsik, R; Prabhu, T. P; Srinivasan, R; Srivatsan, R; Vishwanath, P. R (Tata Institute of Fundamental Research, 2005)
    A 7 telescope array is planned to be constructed at Hanle in the Himalayas at an altitude of about 4200m above mean sea level for detecting celestial gamma-rays. The atmospheric Cerenkov light pool created by the ...
  • Stellar contents and star formation in the young open cluster Stock 8 
    Jose, J; Pandey, A. K; Ojha, D. K; Ogura, K; Chen, W. P; Bhatt, B. C; Ghosh, S. K; Mito, H; Maheswar, G; Sharma, S (Blackwell Publishing, 2008-03)
    We present UBVIc CCD photometry of the young open cluster Stock 8 with the aim of studying its basic properties such as the amount of interstellar extinction, distance, age, stellar contents and initial mass function (IMF). ...
  • Stellar contents and star formation in the young star cluster Be 59 
    Pandey, A. K; Sharma, S; Ogura, K; Ojha, D. K; Chen, W. P; Bhatt, B. C; Ghosh, S. K (Blackwell Publishing, 2008-01)
    We present UBV Ic CCD photometry of the young open cluster Be 59 with the aim to study the star formation scenario in the cluster. The radial extent of the cluster is found to be ~10 arcmin (2.9 pc). The interstellar ...
  • Studies of a possible new Herbig Ae/Be star in the open cluster NGC 7380 
    Mathew, B; Banerjee, D. P. K; Ashok, N. M; Subramaniam, A; Bhavya, B; Joshi, V (Chinese Academy of Sciences, 2012-02)
    We present a study of the star 2MASS J22472238+5801214 with the aim of identifying its true nature which has hitherto been uncertain. This object, which is a member of the young cluster NGC 7380, has been variously proposed ...
  • Study of star formation in NGC 1084 
    Ramya, S; Sahu, D. K; Prabhu, T. P (Blackwell Publishing, 2007-10)
    We present UBVRI broad-band, Hα narrow-band photometry of the star-forming complexes in the infrared bright galaxy NGC 1084. Results of medium-resolution spectroscopy of some of the brighter complexes are also discussed. ...
  • A Study of the Role of Lyβ Fluorescence on O I Line Strengths in Be Stars 
    Blesson, M; Banerjee, D. P. K; Subramaniam, A; Ashok, N. M (IOP Publishing, 2012-07-01)
    The possibility of the Lyβ fluorescence mechanism being operational in classical Be (CBe) stars and thereby contributing to the strength of the O I λ8446 line has been recognized for long. However, this supposition needs ...
  • A tale of two GRB-SNe at a common redshift of z=0.54 
    Cano, Z; Bersier, D; Guidorzi, C; Margutti, R; Svensson, K. M; Kobayashi, S; Melandri, A; Wiersema, K; Pozanenko, A; van der Horst, A. J; Pooley, G. G; Fernandez-Soto, A; Castro-Tirado, A. J; de Ugarte Postigo, A; Im, M; Kamble, A. P; Sahu, D. K; Alonso-Lorite, J; Anupama, G. C; Bibby, J. L; Burgdorf, M. J; Clay, N; Curran, P. A; Fatkhullin, T. A; Fruchter, A. S; Garnavich, P; Gomboc, A; Gorosabel, J; Graham, J. F; Gurugubelli, U. K; Haislip, J; Huang, K; Huxor, A; Ibrahimov, M; Jeon, Y; Jeon, Y. B; Ivarsen, K; Kasen, D; Klunko, E; Kouveliotou, C; LaCluyze, A; Levan, A. J; Loznikov, V; Mazzali, P. A; Moskvitin, A. S; Mottram, C; Mundell, C. G; Nugent, P. E; Nysewander, M; O’Brien, P. T; Park, W. K; Peris, V; Pian, E; Reichart, D; Rhoads, J. E; Rol, E; Rumyantsev, V; Scowcroft, V; Shakhovskoy, D; Small, E; Smith, R. J; Sokolov, V. V; Starling, R. L. C; Steele, I; Strom, R. G; Tanvir, N. R; Tsapras, Y; Urata, Y; Vaduvescu, O; Volnova, A; Volvach, A; Wijers, R. A. M. J; Woosley, S. E; Young, D. R (Wiley-Blackwell, 2011-05)
    We present ground-based and Hubble Space Telescope optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z= 0.54. For GRB 060729, bumps are ...
  • Triggered star formation and evolution of T-Tauri stars in and around bright-rimmed clouds 
    Chauhan, N; Pandey, A. K; Ogura, K; Ojha, D. K; Bhatt, B. C; Ghosh, S. K; Rawat, P. S (Blackwell Publishing, 2009-06)
    The aim of this paper is to quantitatively testify the `small-scale sequential star formation' hypothesis in and around bright-rimmed clouds (BRCs). As a continuation of the recent attempt by Ogura et al., we have carried ...
  • Type Ia supernova SN 2003du: Optical observations 
    Anupama, G. C; Sahu, D. K; Jose, J (EDP Sciences, 2005-01)
    UBVRI photometry and optical spectra of type Ia supernova SN 2003du obtained at the Indian Astronomical Observatory for nearly a year since discovery are presented. The apparent magnitude at maximum was $B=13.53\pm ...
  • Type Ia Supernovae: Progenitors and Peculiarity 
    Nomoto, K; Tanaka, M; Kawabata, K. S; Sahu, D. K; Anupama, G. C (American Institute of Physics, 2007-08)
    Among the controversial issues on Type Ia supernovae (SNe Ia), we discuss (1) the evolutionary paths of the progenitor systems to SNe Ia, especially, the thermal stability of hydrogen shell burning in accreting white dwarfs, ...
  • Type Ib supernova 2008d associated with the luminous x-ray transient 080109: an energetic explosion of a massive helium star 
    Tanaka, M; Tominaga, N; Nomoto, K; Valenti, S; Sahu, D. K; Minezaki, T; Yoshii, Y; Yoshida, M; Anupama, G. C; Benetti, S; Chincarini, G; Valle, M. D; Mazzali, P. A; Pian, E (The American Astronomical Society, 2009-02)
    We present a theoretical model for supernova SN 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modeled based on the progenitor models and the explosion ...
  • The Unique Type Ib Supernova 2005bf: A WN Star Explosion Model for Peculiar Light Curves and Spectra 
    Tominaga, N; Tanaka, M; Nomoto, K; Mazzali, P. A; Deng, J; Maeda, K; Umeda, H; Modjaz, M; Hicken, M; Challis, P; Kirshner, R. P; Wood-Vasey, W. M; Blake, C. H; Bloom, J. S; Skrutskie, M. F; Szentgyorgyi, A; Falco, E. E; Inada, N; Minezaki, T; Yoshii, Y; Kawabata, K; Iye, M; Anupama, G. C; Sahu, D. K; Prabhu, T. P (The American Astronomical Society, 2005-11-10)
    Observations and modeling for the light curve (LC) and spectra of supernova (SN) 2005bf are reported. This SN showed unique features: the LC had two maxima, and declined rapidly after the second maximum, while the spectra ...
  • Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time scale 
    Goyal, A; Gopal-Krishna; Anupama, G. C; Sahu, D. K; Sagar, R; Britzen, S; Karouzos, M; Aller, M. F; Aller, H. D (Wiley Blackwell, 2009-07)
    We present the result of our extensive intranight optical monitoring of the well known low-energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of $R$-band monitoring for a minimum duration of ...
  • An unusual very low-mass high-amplitude pre-main sequence periodic variable 
    Rodríguez-Ledesma, M. V; Mundt, R; Ibrahimov, M; Messina, S; Parihar, P. S; Hessman, F. V; Alves de Oliveira, C; Herbst, W (EDP Sciences, 2012-08)
    Aims. We have investigated the nature of the variability of CHS 7797, an unusual periodic variable in the Orion Nebula Cluster. Methods. An extensive I-band photometric data set of CHS 7797 was compiled between 2004−2010 ...
  • The unusually large population of Blazhko variables in the globular cluster NGC 5024 (M53) 
    Arellano Ferro, A; Bramich, D. M; Figuera Jaimes, R; Giridhar, S; Kuppuswamy, K (Wiley-Blackwell, 2012-02)
    We report the discovery of amplitude and phase modulations typical of the Blazhko effect in 22 RRc and nine RRab type RR Lyrae stars in NGC 5024 (M53). This brings the confirmed Blazhko variables in this cluster to 23 RRc ...
  • Variables in Globular Cluster NGC 5024 
    Safonova, M; Stalin, C. S (IOP Publishing, 2011-12)
    We present the results of a commissioning campaign to observe Galactic globular clusters for the search of microlensing events. The central 10' × 10' region of the globular cluster NGC 5024 was monitored using the 2 m ...

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