Research Papers: Recent submissions

  • New survey of UBV photometry and absolute paper motions at internediate latitude 
    Ojha, D. K.; Bienayme, O.; Mohan, V.; Robin, A. C. (1999)
    A photometric and proper motion survey has been obtained in 2 directions at intermediate latitude: (l = 167.5° , b = 47.4° ; α₂ₒₒₒ= 9ʰ 41ᵐ 26ᶳ ,δ₂ₒₒₒ = +49° 53' 27” ) and (l = 278° , b = 47° ; α₂ₒₒₒ = 11ʰ 42ᵐ 56ᶳ , δ₂ₒₒₒ ...
  • Stellar contents of two young open clusters: NGC 663 and 654 
    Pandey, A. K.; Upadhyay, K.; Ogura, K.; Sagar, R.; Mohan, V.; Mito, H.; Bhatt, H. C.; Bhatt, B. C. (2005)
    UBVRI CCD photometry in a wide field around two young open clusters, NGC 663 and 654, has been carried out. Hα and polarimetric observations for the cluster NGC 654 have also been obtained. We use the photometric data ...
  • Photometric study of two novae in M 31 
    Joshi, Y. C.; Pandey, A. K.; Narasimha, D.; Giraud-Heraud, Y.; Sagar, R.; Kaplan, J. (2004)
    We report R ̜ I ̜ light curves of 2 novae in the M 31 galaxy which were detected in the four year Nainital Microlensing Survey. One of these novae has been tracked from the initial increase in flux while other has been ...
  • Multiband optical photometry and bolometric light curve of the Type Ia supernova 2004S 
    Misra, K.; Kamble, A. P.; Bhattacharya, D.; Sagar, R. (2005)
    We present BVR ̜ I ̜ broad-band CCD photometry of the Type Ia supernove SN 2004S, which appeared in the galaxy MCG-05-16-021, obtained during 2004 February 12 to March 22. We present multiband and bolometric light curves ...
  • Studies of chemically peculiar stars 
    Joshi, S. (2005)
    This thesis is on the framework of the “NainiTal-Cape Survey" programme for searching photometric variability in chemically peculiar stars, initiated in 1997 at the ARIES, NainiTal, India, in collaboration with the South ...
  • VLT-UVES analysis of two giants in the bulge metal-poor globular cluster HP-1: Analysis of two giants in HP-1 
    Barbuy, B.; Zoccali, M.; Ortolani, S.; Momany, Y.; Minniti, D.; Hill, V.; Renzini, A.; Rich, R. M.; Bica, E.; Pasquini, L.; Yadav, R. K. S. (2006)
    Metal-poor globular clusters in the bulge are important tracers of early chemical evolution. HP-1 is among the six metal-poor clusters within 5º of the Galactic center, and could be the one closest to the center. The main ...
  • Unravelling the nature of HD81032: A new RS CVn binary 
    Pandey, J. C.; Singh, K. P.; Drake, S. A.; Sagar, R. (2005)
    BVR photometric and quasi-simultaneous optical spectroscopic observations of the star HD81032 have been carried out during the years 2000–2004. A photometric period of 18.802 ± 0.07d has been detected for this star. A large ...
  • Optical observations of GRB afterglows from India 
    Sagar, R.; Misra, K. (2005)
    Optical observations of GRB afterglows provide information about GRB distances as well as their isotropic/non-isotropic nature of emission. More than 30 GRB fields have been probed by us during 1999 to 2003, out of which ...
  • Multiband optical monitoring of the blazars S5 0716+714 and BL Lacertae 
    Stalin, C. S.; Gopal-Krishna; Sagar, R.; Wiita, P. J.; Mohan, V.; Pandey, A. K. (2006)
    We report the results of multiband optical photometric monitoring of two well-known blazars, S5 0716+714 and BL Lacertae, carried out during 1996 and 2000–01 with an aim to study optical variations on time-scales ranging ...
  • Periodicities in sunspot activity during solar cycle 23 
    Joshi, B.; Pant, P.; Manoharan, P. K. (2006)
    The data of sunspot numbers, sunspot areas and solar flare index during cycle 23 are analyzed to investigate the intermediate- term periodicities. Power spectral analysis has been performed separately for the data of ...
  • A statistical analysis of the detection limits of fast photometry 
    Mary, D. L. (2006)
    This work investigates the statistical limits for the detection of stellar variability using ground based fast photometry. We show that when sky transparency variations are very low or have been efficiently removed from ...
  • Origin of disc lopsidedness in the Eridanus group of galaxies 
    Angiras, R. A.; Jog, C. J.; Omar, A.; Dwarakanath, K. S. (2006)
    The H I surface density maps for a sample of 18 galaxies in the Eridanus group are Fourier analysed. This analysis gives the radial variation of the lopsidedness in the H I spatial distribution. The lopsidedness is ...
  • Ground-based CCD astrometry with wide field imagers : Observations just a few years apart allow decontamination of field objects from members in two globular clusters 
    Anderson, J.; Bedin, L. R.; Piotto, G.; Yadav, R. S.; Bellini, A. (2006)
    This paper is the first of a series of papers in which we will apply the methods we have developed for high-precision astrometry (and photometry) with the Hubble Space Telescope (HS T ) to the case of wide-field ground-based ...
  • The Nainital-Cape Survey : Report for pulsation in five chemically peculiar A-type stars and presentation of 140 null results 
    Joshi, S.; Mary, D. L.; Martinez, P.; Kurtz, D. W.; Girshi, V.; Seetha, S.; Sagar, R.; Ashoka, B. N. (2006)
    We search for photometric variability in chemically peculiar A type stars in the northern hemisphere. High-speed photometric observations of Ap and Am star candidates have been carried out from ARIES (Manora ...
  • 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. (2009)
    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 ...
  • Aerosol characteristics at a high-altitude location during ISRO–GBP Land Campaign-II 
    Pant, P.; Hegde, P.; Dumka, U. C.; Saha, A.; Srivastava, M. K.; Sagar, R. (2006-10-25)
    We present detailed analysis of the extensively measured aerosol parameters at the Aryyabhatta Research Institute of Observational Sciences (ARIES), Manora Peak Nainital, during ISRO-GBP Land Campaign-II. This land campaign ...
  • Optical afterglow observations of GRB 021004 and GRB 030226 
    Pandey, S. B.; Sagar, R.; Bhattacharya, D. (2005)
    Optical photometric observations of GRB 021004 and GRB 030226 afterglows in BVRI and UBRI passbands respectively [2, 3] were carried out the 1.04-m Telescope of the ARIES, Naini Tal and the 2.01-m Telescope at the Indian ...
  • Spectrophotometric study of the comet C/2001 Q4 (NEAT) 
    Singh, M.; Sanwal, B. B.; Kumar, B. (2006)
    Spectrophotometric observations of the comet C/2001 Q4 (NEAT) were taken on three nights of May 13, 18 and 19, 2004 near its perihelion distance using 104-cm telescope of ARIES, Nainital. The Cassegrain HR- 320 ...
  • Surface changes in solar irradiance due to aerosols over central Himalayas 
    Dumka, U. C.; Satheesh, S. K.; Pant, P.; Hegde, P.; Moorthy, K. K. (2006)
    During a comprehensive aerosol field campaign as a part of the ISRO-GBP, extensive measurements of radiative fluxes at the surface were made during December 2004 at Manora Peak, in the Shivalik ranges of the Central ...
  • North–South distribution of solar flares during Cycle 23 
    Joshi, B.; Pant, P.; Manoharan, P. K. (2006)
    In this paper, we investigate the spatial distribution of solar flares in the northern and southern hemispheres of the Sun that occurred during the period 1996 to 2003. This period of investigation includes the ...

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