ARIES Insitutional Digital Repositary (ARIES-IDR): Recent submissions

  • Characterization of the semi-annual-oscillation in mesospheric temperatures at low-latitudes 
    Taylor, M. J.; Taori, A. K.; Hatch, D. R.; Liu, H. L.; Roble, R. G. (2005)
    Novel measurements of the seasonal variability in mesospheric temperature at low-latitudes have been obtained from Maui, Hawaii (20.8°N, 156.2°W) during a 25-month period from October 2001 to January 2004. Independent ...
  • V , I CCD photometry of metal-rich bulge globular clusters: NGC 6553 
    Sagar, R.; Subramaniam, A.; Richtler, T.; Grebel, E. K. (1999)
    We have carried out V I CCD photometry of about 40 000 stars down to V ∼ 23 mag in an area of about 6' × 10' centered on the metal-rich Galactic bulge globular cluster NGC 6553 and an adjacent field region. Our ...
  • Microthermal measurements of surface layer seeing at Devasthal site 
    Pant, P.; Stalin, C. S.; Sagar, R. (1999)
    In order to detect the microthermal fluctuations introduced by the atmospheric turbulence very near to the ground at Devasthal site, a PC based instrumenta tion has been developed. The optical image degradation due to ...
  • The Tully–fisher relations of the Eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2006)
    The Tully–Fisher (TF) or the luminosity–linewidth relations of the galaxies in the Eridanus group are constructed using the HI rotation curves and the luminosities in the optical and in the near-infrared bands. The slopes ...
  • A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336−018 (NY Vir) 
    Kilkenny, D., ... et al. (including Joshi, S.) (2003)
    We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) ...
  • Flares from the giant ar 9433 on 24 april 2001 
    Joshi, A.; Chandra, R.; Uddin, W. (2003)
    We present Hα CCD observations of three small-to-medium-size two-ribbon flares observed in the giant AR 9433 on 24 April 2001. Flare observations at other associated wavelengths (e.g., soft X-rays (SXR), hard X-rays (HXR), ...
  • Multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 
    Sagar, R.; Krishna-Gopal; Mohan, V.; Pandey, A. K.; Bhatt, B. C.; Wagner, S. J. (1999)
    We report multi-colour optical monitoring of the intra-day variable blazar S5 0716+71 with a dense temporal coverage over a total duration of 4 weeks in February/March 1994. Four filters (BV Johnson and RI Cousins) ...
  • Cosmic-ray periodicity at 170 days 
    Joshi, A. (1998)
    Power-spectral analysis of cosmic-ray indices (CRI) data for the years 1989–1991 shows a 170-day periodicity of cosmic rays. The periodicity is related to a strong magnetic field. Power- spectral analysis of the ...
  • On the distribution and asymmetry of solar active prominences 
    Verma, V. K. (1999)
    The paper presents the results of a study of the distribution and asymmetry of solar active prominences (SAP) for the period 1957 – 1998 (solar cycles 19 – 23). The east-west (E-W) distribution study shows that the ...
  • Solar log gf values in the infrared J and H bands 
    Stalin, C. S.; Trivedi, C.; Sinha, K.; Sanwal, B. B. (1997)
    Solar IR spectra have been utilized to derive log gf value for atomic lines due to 17 chemical elements. From a recent publication in Astronomy and Astrophysics Supplement, we selected unblended solar lines in the infrared ...
  • Constraining the evolution of ZZ CETI 
    Mukadam, A. S., ... et al. (including Joshi, S.) (2003-09-10)
    We report our analysis of the stability of pulsation periods in the DAV star (pulsating hydrogen atmosphere white dwarf ) ZZ Ceti, also called R548. On the basis of observations that span 31 years, we conclude that the ...
  • Coronal holes and flare index: A Correlation Study 
    Joshi, A. (2000)
    The correlation between the presence of coronal holes and flare indices has been inves- tigated for the period from 1976 to 1995. The analysis shows that in the cases of 227 Carrington rotations (CRs) backward time lags ...
  • The afterglow and the host galaxy of GRB 011211 
    Jakobsson, P., ... et al. (including Pandey, S. B.) (2003)
    WWe present optical, near-infrared, and X-ray observations of the optical afterglow (OA) of the X-ray rich, longduration gamma-ray burst GRB 011211. Hubble Space Telescope (HST) data obtained 14, 26, 32, and 59 days after ...
  • The optical afterglow of the not so dark GRB 021211 
    Pandey, S. B.; Anupama, G. C.; Sagar, R.; Bhattacharya, D.; Castro-Tirado, A. J.; Sahu, D. K.; Parihar, P.; Prabhu, T. P. (2003)
    We determine Johnson B,V and Cousins R, I photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been probably missed if no ...
  • Photometric binary content in intermediate/old open clusters 
    Sandhu, T. S.; Pandey, A. K.; Sagar, R. (2003)
    The stellar evolutionary models by Bertelli et al. (1994) have been used to generate synthetic colour–magnitude diagrams (CMDs) of open clusters. A comparison of the synthetic integrated luminosity function (ILF) and ...
  • The extraordinarily bright optical afterglow of GRB 991208 and its host galaxy 
    Castro-Tirado, A. J.,... et. al. (including R. Sagar) (2001)
    Broad-band optical observations of the extraordinarily bright optical afterglow of the intense gamma-ray burst GRB 991208 started ∼2.1 days after the event and continued until 4 Apr. 2000. The flux decay constant of the ...
  • Photometry and low resolution spectroscopy of hot post-AGB candidates 
    Gaubal, G.; Parthasarathy, M.; Kumar, B.; Yadav, R. K. S.; Sagar, R. (2003)
    We have obtained Johnson U, B, V and Cousins R, I photometry and low resolution spectra of a small sample of hot post-AGB candidates. Using the present data in combination with JHK data from 2MASS, infrared data from the ...
  • GRB 000926 and its optical afterglow: Another possible evidence for non-isotropic emission 
    Sagar, R.; Pandey, S. B.; Mohan, V.; Bhattacharya, D.; Castro-Tirado, A. J. (2001)
    The CCD Johnson BV and Cousins RI photometric magnitudes are determined for 20 stars in the field of GRB 000926. They are used to calibrate the present R as well as published BVRI photometric magnitudes of the GRB 000926 ...
  • Identification of 13 Cepheids and 333 other variables in M31 
    Joshi, Y. C.; Pandey, A. K.; Narasimha, D.; Sagar, R.; Eraud, Y. G. (2003)
    We present Cousins R and I band photometry of variable stars in a ∼13` × 13` region in the disk of M31 galaxy, obtained during 141 nights. Of the 26 Cepheid variables present in the region, two are newly discovered, 11 are ...
  • Discovery of unusual pulsations in the cool, evolved Am stars HD 98851 and HD 102480 
    Joshi, S.; Girish, V.; Sagar, R.; Kurtz, D. W.; Martinez, P.; Kumar, B.; Seetha, S.; Ashoka, B. N.; Zhou, A. (2003)
    The chemically peculiar (CP) stars HD 98851 and HD 102480 have been discovered to be unusual pulsators during the ‘Naini Tal–Cape Survey’ programme to search for pulsational variability in CP stars. Time series photometric ...

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