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  • Yake effects in various telescope mirrors 
    Gupta, K. G (Astronomical Society of Indian, 1989-09)
    The yake effect in the 56 cm and the 38 cm pyrex mirrors of the Uttar Pradesh State Observatory is described. Similar effects elsewhere are also discussed.
  • Yields of nucleosynthesis from massive and intermediate mass stars and constraints on their final evolution 
    Mallik, D. C. V; Mallik, S. G. V (Indian Academy of Sciences, 1985-09)
    Nucleosynthetic yields and production rates of He and heavy elements are derived using recent revisions in O star counts and the stellar models of Maeder (1981). The current production rates and yields are significantly ...
  • Young Galactic Clusters 
    Kilambi, G. C (Astronomical Society of India, 1983-12)
    The evolutionary nature of the young galactic clusters, from both observational as well as theoretical points of view, is briefly discussed. In addition, some of the interesting properties of the individual objects associated ...
  • Young LMC star clusters as a test for stellar evolutionary models. 
    Subramaniam, A; Sagar, R (The European Southern Observatory, 1995-05)
    We compare the observed colour-magnitude diagrams (CMD) and the main sequence luminosity functions (LFs) of four Large Magellanic Cloud (LMC) star clusters namely, NGC 1711, NGC 2004, NGC 2164 and NGC 2214 with the synthetic ...
  • Young open clusters and star formation 
    Piskunov, A. E (Astronomical Society of India, 2001)
  • The Young Open Star Clusters: Stability and Structure 
    Pandey, A. K; Mahra, H. S; Sagar, R (American Astronomical Society, 1990-02)
    It is found to the differential extinction ΔE (B-V) in open clusters which may be due to the presence of gas and dust, decreases systematically with age of the cluster. Consequently we can infer that the average gas removal ...
  • Young star clusters of our galaxy and the large magellanic cloud as test for stellar evolutionary models 
    Sagar, R; Subramaniam, A (Universidad Nacional Autonoma de Mexico, 1999)
    A comparison of the colour-magnitude diagrams (CMDs) and the main sequence luminosity function (LF) of five young Galactic star clusters and four young Large Magellanic Cloud star clusters derived from precise CCD observations ...
  • Young Stars and Nonstellar Emission in the Aligned Radio Galaxy 3C 256 
    Simpson, C; Eisenhardt, P; Armus, L; Chokshi, A; Dickinson, M; Djorgovski, S. G; Elston, R; Jannuzi, B. T; McCarthy, P. J; Pahre, M. A; Soifer, B. T (The American Astronomical Society, 1999-11)
    We present ground-based images of the z=1.824 radio galaxy 3C 256 in the standard BVRIJHK filters and an interference filter centered at 8800 Å, a Hubble Space Telescope image in a filter dominated by Lyα emission (F336W), ...
  • Young stellar objects and their environment 
    Choudhury, R (Astronomical Society of India, 2012)
    This paper presents the results of a Ph.D thesis emphasizing the studies of various characteristics of Young Stellar Objects (YSOs) and their environment. The main objective of the thesis is to study the effects of mechanical ...
  • Young stellar population and ongoing star formation in the H ii complex Sh2-252 
    Jose, J; Pandey, A. K; Samal, M. R; Ojha, D. K; Ogura, K; Kim, J. S; Kobayashi, N; Goyal, A; Chauhan, N; Eswaraiah, C (Oxford University Press on behalf of the Royal Astronomical Society, 2013-07-11)
    In this paper, an extensive survey of the star-forming complex Sh2-252 has been undertaken with an aim to explore its hidden young stellar population as well as to understand the structure and star formation history for ...
  • Young stellar population in the star-forming complex Sh2-252 
    Jose, J; Pandey, A. K; Ogura, K; Bhatt, B. C (Astronomical Society of India, 2012)
    We present the preliminary results of our multi-wavelength analyses of the young stellar population associated with the star forming complex Sh2-252. The NIR and MIR data sets from 2MASS and Spitzer-IRAC, MIPS identified ...
  • Young stellar population of bright-rimmed clouds BRC 5, BRC 7 and BRC 39 
    Panwar, N; Chen, W. P; Pandey, A. K; Samal, M. R; Ogura, K; Ojha, D. K; Jose, J; Bhatt, B. C (Oxford University Press on behalf of the Royal Astronomical Society, 2014-09-11)
    Bright-rimmed clouds (BRCs), illuminated and shaped by nearby OB stars, are potential sites of recent/ongoing star formation. Here we present an optical and infrared photometric study of three BRCs: BRC 5, BRC 7 and BRC ...
  • Zeeman line formation in solar magnetic fields. Studies with empirical probability distribution functions 
    Sampoorna, M; Nagendra, K. N; Frisch, H; Stenflo, J. O (EDP Sciences, 2008-07)
    Context. Numerical simulations of magneto-convection and analysis of solar magnetograms provide probability distribution functions (PDFs) for the magnetic field strength. Aims. In the paper, we explore the effects of these ...
  • The zenithal 4-m International Liquid Mirror Telescope: a unique facility for supernova studies 
    Brajesh Kumar; Pandey, Kanhaiya L; Pandey, S. B; Hickson, P; Borra, E. F; Anupama, G. C; Surdej, J (Oxford University Press on behalf of the Royal Astronomical Society, 2018-05)
    The 4-m International Liquid Mirror Telescope (ILMT) will soon become operational at the newly developed Devasthal observatory near Nainital (Uttarakhand, India). Coupled with a 4k × 4k pixels CCD detector and TDI optical ...
  • Zodiacal light and the false dawn 
    Vayada, Nilesh; Talwar, Ajay (NASA, 2012-01-16)
    Explanation: Is it dawn or false dawn? During certain times of the year, the horizon near the rising Sun will begin to glow unusually early. This early glow does not originate directly from the Sun, but rather from sunlight ...
  • Zonal velocity bands and the solar activity cycle 
    Sivaraman, K. R; Antia, H. M; Chitre, S. M; Makarova, V. V (Springer Netherlands, 2008-09)
    We compare the zonal-flow pattern in subsurface layers of the Sun with the distribution of surface magnetic features such as sunspots and polar faculae. We demonstrate that, in the activity belt, the butterfly pattern of ...
  • ɛ Aur in eclipse: Post-AGB primary and disk-shaped secondary 
    Muthumariappan, C; Parthasarathy, M; Jayakumar, K; Appakutty, M (Cambridge University Press, 2012-08)
    We present physical and chemcal properties of the disk in the eclipsing binary system ɛ Aur by solving 2D radiative transfer problem. We also present preliminary results of our high resolution spectroscopic monitoring of ...
  • β-SGP: Scaled Gradient Projection with β-divergence for astronomical image restoration 
    Gondhalekar, Y; Safonova, M; Saha, S (Elsevier B.V., 2023-07)
    Image restoration in astronomy has been considered a vital step in many ground-based observational programs that often suffer from sub-optimal seeing due to atmospheric turbulence, distortion of stellar shapes due to ...
  • γ and X ray measurements during total solar eclipse on October 24, 1995 at Diamond Harbour 
    Chintalapudi, S. N; Ghosh, V; Krishna, J. B. M; Verman, J. R; Prakash, H; Pal, G; Mishra, N. R; Bera, M; Reddy, V. R; Ranganath, M. R; Majumdar, C. K (Indian Institute of Astrophysics, Bangalore, 1997)
    The γ-ray and X-ray background was measured at Diamond Harbor located on the total eclipse phase path, during total solar eclipse (TSE) which occurred on October 24, 1995. The data taken by two high resolution γ-ray ...
  • θ-z test for QSO - galaxy physical association 
    Sapre, A. K; Nashine, R; Mishra, V. D (Astronomical Society of India, 1999)
    The θ-z test devised by Burbidge et al, (1972, 1990) may serve as a powerful test to decide the reality or otherwise of the physical association hypothesis for the QSO-bright galaxy close pairs with discrepant redshifts. ...

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