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Browsing IIAP Publications by Title

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  • O VI absorption in the milky way along the large magellanic cloud lines of sight 
    Sarma, R; Pathak, A; Pradhan, A. C; Murthy, J; Sarma, J. K (Elsevier B.V, 2014-03-15)
    We have used Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the Large Magellanic Cloud (LMC) to determine the O vi column densities in the Milky Way (MW) towards 6 LMC lines of sight. The mean column density ...
  • O VI Asymmetry and an Accelerated Outflow in an Obscured Seyfert: FUSE and HST STIS Spectroscopy of Mrk 533 
    Shastri, P; Murthy, J; Whittle, Mark; Wills, B. J (The American Astronomical Society, 2006-07-20)
    We present far-ultraviolet spectra of the Seyfert 2 galaxy Mrk 533 obtained with FUSE. These spectra show narrow asymmetrical O VI λλ1032,1038 emission lines with stronger wings shortward of the peak wavelength, but the ...
  • [O/Fe] Estimates for Carbon-enhanced Metal-poor Stars from Near-infrared Spectroscopy 
    Kennedy, C. R; Sivarani, T; Beers, T. C; Lee, Y. S; Placco, V. M; Rossi, S; Christlieb, N; Herwig, F; Plez, B (IOP Publishing, 2011-03)
    We report on oxygen abundances determined from medium-resolution near-infrared spectroscopy for a sample of 57 carbon-enhanced metal-poor (CEMP) stars selected from the Hamburg/ESO Survey. The majority of our program stars ...
  • Obituaries: Prof. C. Michie Smith 
    The Editor (Nature Publishing Group, 1922-11)
  • Obituary - Bappu, M. K 
    Bhattacharyya, J. C (Royal Astronomical Society, 1983-03)
  • Obituary: Professor Charles Michie Smith 
    Eddington, A. S (Royal Astronomical Society, 1923-02)
  • Object-oriented programming approach to CCD data acquisition and image processing 
    Naidu, B. N; Srinivasan, R; Muralishankar, S (SPIE-The International Society for Optical Engineering, 1997-10)
    In the recent past both the CCD camera controller hardware and software have witnessed a dynamic change to keep pace with the astronomer's imaging requirements. Conventional data acquisition software is based on menu driven ...
  • Obscured and powerful AGN and starburst activities at z ~ 3.5 
    Polletta, M; Omont, A; Berta, S; Bergeron, J; Stalin, C. S; Petitjean, P; Giorgetti, M; Trinchieri, G; Srianand, R; McCracken, H. J; Pei, Y; Dannerbauer, H (EDP Sciences, 2008-12)
    Aims. Short phases of coeval powerful starburst and AGN activity during the lifetimes of the most massive galaxies are predicted by various models of galaxy formation and evolution. In spite of their recurrence and high ...
  • Observability of Coronal Heating Processes 
    Venkatakrishnan, P (Kluwer Academic Publishers, 1996)
    The mechanisms that could possibly heat the corona are briefly reviewed with emphasis on their observability. Observing enhanced wave flux at footpoints of active regions would confirm wave heating. Observation of nonthermal ...
  • Observation of a magnetic sub-storm event in the equatorial thermosphere - suggestions for interpretation 
    Saha, S. K (Indian Association for the Cultivation of Science, 2001)
  • Observation of Alfven Waves in an ICME-HSS Interaction Region 
    Dhamane, Omkar; Raghav, Anil; Shaikh, Zubair; Panchal, Utsav; Ghag, Kalpesh; Tari, Prathmesh; Choraghe, Komal; Bhaskar, Ankush; Telloni, Daniele; Mishra, Wageesh (Springer, 2023-03)
    The Alfvén wave (AW) is the most common fluctuation present within the solar wind emitted from the Sun. Whether or not AWs can originate after the collision of an Interplanetary Coronal Mass Ejection (ICME) and a High-Speed ...
  • Observation of an H-alpha outburst in the Be star HR 4123 
    Ghosh, K. K; Apparao, K. M. V; Tarafdar, S. P (American Astronomical Society, 1989-09)
    During routine monitoring of the Be star HR 4123 during the year 1987-1988, a burst of H-alpha emission was observed on May 11, 1987. The increase was observed on May 9 and lasted until June 7, peaking to an equivalent ...
  • Observation of Intensity Oscillations in Corona during the Total Solar Eclipse of October 24, 1995 
    Singh, J (Indian Institute of Astrophysics, Bangalore, 1997)
    An experiment to search for short-period oscillations in the solar corona was conducted during the total solar eclipse of 1995 October 24 at Kalpi, India. The intensity in the continuum, centred around 5500 Armsrong and ...
  • Observation of R-Band Variability of L Dwarfs 
    Maiti, M; Sengupta, S; Parihar, P. S; Anupama, G. C (University of Chicago Press, 2005-02)
    We report, for the first time, photometric variability of L dwarfs in the R band. Out of three L1 dwarfs (2MASS 1300+19, 2MASS 1439+19, and 2MASS 1658+70) observed, we have detected R-band variability in 2MASS 1300+19 and ...
  • Observation of Total Solar Eclipse of October 24, 1995 
    Hiei, K; Inoue, K; Takahashi, N; Fukushima, H (Indian Institute of Astrophysics, Bangalore, 1997)
    K-corona and E-corona were observed at Dundlodh in India. Coronal image, processed by a computer, shows polar plumes in north- and south-pole and streamers at east- and west-limb.
  • Observational evidence of optical variability in L dwarfs 
    Maiti, M (The American Astronomical Society, 2007-04)
    The results of quasi-simultaneous continuous monitoring of six L dwarfs in the R and I bands are presented. A careful analysis of the data shows that the object 2MASSW J0036+1821 is variable in the I and R bands. The ...
  • Observational Evidence Points at AGB Stars as Possible Progenitors of CEMP-s and CEMP-r/s Stars 
    Meenakshi, P; Goswami, A (IOP Publishing, 2021-11-20)
    The origin of enhanced abundance of heavy elements observed in the surface chemical composition of carbonenhanced metal-poor (CEMP) stars still remains poorly understood. Here, we present detailed abundance analysis of ...
  • Observational Properties of a Bright Type lax SN 2018cni and a Faint Type Iax SN 2020kyg 
    Singh, Mridweeka; Sahu, D. K; Dastidar, Raya; Barna, Barnabas; Misra, Kuntal; Gangopadhyay, Anjasha; Howell, D. Andrew; Jha, Saurabh W.; Im, Hyobin; Taggart, Kirsty; Andrews, Jennifer; Hiramatsu, Daichi; Teja, Rishabh Singh; Pellegrino, Craig; Foley, Ryan J.; Joshi, Arti; Anupama, G. C; Bostroem, K. Azalee; Burke, Jamison; Camacho-Neves, Yssavo; Dutta, Anirban; Kwok, Lindsey A.; McCully, Curtis; Pan, Yen-Chen; Siebert, Matt; Srivastav, Shubham; Szalai, Tamás; Swift, Jonathan J.; Yang, Grace; Zhou, Henry; DiLullo, Nico; Scheer, Jackson (American Astronomical Society, 2023-08-10)
    We present the optical photometric and spectroscopic analysis of two Type Iax supernovae (SNe), 2018cni and 2020kyg. SN 2018cni is a bright Type Iax SN (MV,peak = −17.81 ± 0.21 mag), whereas SN 2020kyg (MV,peak = −14.52 ± ...
  • Observational properties of a type Ib supernova MASTER OT J120451.50+265946.6 in NGC 4080 
    Singh, M; Misra, K; Sahu, D. K; Dastidar, R; Gangopadhyay, A; Srivastav, S; Anupama, G. C; Bose, S; Lipunov, V; Chakradhari, N. K; Brajesh Kumar; Pandey, S. B; Gorbovskoy, E; Balanutsa, P (Oxford University Press on behalf of the Royal Astronomical Society, 2019-06)
    MASTER OT J120451.50+265946.6 (M12045), discovered by the MASTER Global Robotic Net, is a Type Ib supernova (SN) that exploded in NGC 4080. We present the BVRI photometric and spectroscopic observations up to ∼250 d since ...
  • Observational Results from SN1987A and their Implications on Theoretical Modelling of Supernovae 
    Ray, Alak (Indian Institute of Astrophysics, 1988)
    In the approximately one year since the explosion of the Supernova 1987A in the Large Magellanic Cloud, a large amount of work, both observational as well as theoretical, has been undertaken. Stan Woosley, a prolific worker ...

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