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

  • GMRT H I observations of the Eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2005)
    TThe GMRT H I 21cm-line observations of galaxies in the Eri- danus group are presented. The Eridanus group, at a distance of ∼ 23 Mpc, is a loose group of ∼ 200 galaxies. The group extends to more than 10 Mpc in ...
  • Dust properties in Early-type Galaxies 
    Patil, M. K.; Sahu, S. K.; Pandy, S. K.; Kembhavi, A. K.; Joshi, U. C.; Baliyan, K. S.; Singh, M. (2002)
    We have carried out optical and near-IR photometric analysis of some of the early-type galaxies with the objective of studying of studying their dust properties, and to see how different these are from the properties of ...
  • The HI content of the eridanus group of galaxies 
    Omar, A.; Dwarakanath, K. S. (2005)
    The HI content of galaxies in the Eridanus group is studied using the GMRT observations and the HIPASS data. A significant HI deficiency up to a factor of 2–3 is observed in galaxies in the high galaxy density regions. The ...
  • Photometric variability of four coronally active stars 
    Pandey, J. C.; Singh, K. P.; Sagar, R.; Drake, S. A. (2002)
    We present photometric observations of four stars that are optical counterparts of soft X-ray/EUV sources, namely 1ES 0829+15.9, 1ES0920-13.6, 2RE J110159+223509 and 1ES 1737+61.2. We have dis- covered periodic ...
  • Interstellar extinction in the open clusters towards galactic longitude around 130◦ 
    Pandey, A. K.; Upadhyay, K.; Nakada, Y.; Ogura, K. (2003)
    In this paper we present a detailed study of the intra-cluster reddening material in the young open clusters located around l ∼ 130◦ using colour-excess diagrams and two-colour diagrams. The study supports the universality ...
  • Spectrophotometry of the comets C/2000 WM1 (LINEAR) and C/2002 C1 (Ikeya-Zhang) 
    Sanwal, B. B.; Kumar, B.; Singh, M. (2002)
    Spectrophotometric observations of the coma of the comets C/2000 WM 1 (LINEAR) and C/2002 C1 (Ikeya-Zhang) were taken during Now, Dec 2001 and Mar, Apr 2002 respectively with 104-cm telescope of the State Observatory, ...
  • Radio continuum and far-infrared emission from the galaxies in the eridanus group 
    Omar, A.; Dwarakanath, K. S. (2005)
    The Eridanus galaxies follow the well-known radio–FIR correlation. The majority (70%) of these galaxies have their star formation rates below that of the Milky Way. The galaxies that have a significant excess of radio ...
  • Discovery of pulsations in HD 98851 
    Joshi, S.; Girish, V.; Martinez, P.; Sagar, R.; Ashoka, B. N.; Gupta, S. K.; Seetha, S.; Chaubey, U. S.; Kurtz, D. W. (2001)
    Using the UPSO 1- m Sampurnanand reflector telescope equipped with a fast photometer, we observed the chemically peculiar (CP) star HD 98851 for a total of around 30 hours on 5 different nights between January to April ...
  • Distribution of Hα flares during solar cycle 23 
    Joshi, B.; Pant, P. (2005)
    The paper presents the results of an analysis of the north-south (N−S) and east-west (E−W) distribution of Hα solar flares from 1996 to 2003. This period of investigation corresponds to the ascending phase, the maximum and ...
  • Intermediate-term periodicities in soft x-ray flare index during solar cycles 21, 22 and 23 
    Joshi, B.; Joshi, A. (2005)
    We have analyzed the intermediate-term periodicities in soft X-ray flare index (FIsₓR) during solar cycles 21, 22 and 23. Power-spectral analysis of daily FIsₓR reveals a significant period of 161 days in cycle 21 which ...
  • Optical and x-ray studies of chromospherically active stars: FR cancri, HD 95559, and lo pegasi 
    Pandey, J. C.; Singh, K. P.; Drake, S. A.; Sagar, R. (2005-09)
    We present a multiwavelength study of three chromospherically active stars, namely, FR Cnc (BD +16º1753), HD 95559, and LO Peg (BD +22º4409), including newly obtained optical photometry and low-resolution optical spectroscopy ...
  • Naini Tal – Cape survey for pulsating chemically peculiar stars – A status report 
    Seetha, S.; Chaubey, U. S.; Girish, V.; Joshi, S.; Ashoka, B. N.; Gupta, S. K.; Kurtz, D. W.; Martinez, P.; Sagar, R. (2001)
    The “Naini Tal-Cape survey for rapidly oscillating Ap stars”, to search the northern hemi-sphere sky for pulsating stars was initiated in 1997. This is a collaboration between India and South Africa. So far about 70 stars ...
  • Radio, millimeter and optical monitoring of GRB 030329 afterglow: Constraining the double jet model 
    Resmi, L., ... et al. (including Pandey, S. B. and Sagar, R.) (2005)
    We present radio, millimeter and optical observations of the afterglow of GRB 030329. UBVR˓I˓ photometry is presented for a period of 3 h to 34 days after the burst. Radio monitoring at 1280 MHz has been carried out using ...
  • Optical follow-up of GRB afterglows from UPSO, Naini Tal 
    Pandey, S. B.; Sagar, R.; Mohan, V.; Pandey, A. K.; Bhattacharya, D.; Castro-Tirado, A. J. (2001)
    Successful optical photometric observations of live GRB afterglows namely GRB 990123, GRB 991216, GRB 000301c and GRB 000926 have been carried out from State Observatory Naini Tal till 2000. the reesults and light curve ...
  • UPSO three channel fast photometer 
    Gupta, S. K.; Sagar, R.; Joshi, S.; Ashoka, B. N.; Babu, V. C.; Seetha, S.; Girish, V. (2001)
    The design and performance of a modular portable three channel fast photometer is described. It can be disassembled as single individual channels such that the system can also be used as a single channel photometer. The ...
  • Performance of the IIA mosaic CCD camera system 
    Naidu, B. N.; Srinivasan, R.; Mohan, V.; Sagar, R. (2001)
    We evaluate performance of the 4K x 4K mosaic CCD camera system development at the Indian Institute of Astrophysics using four Thomson CCDs in a buttable configuration. The cameras system consists of a mosaic CCD dewar ...
  • New pulsating variables discovered from the Naini Tal-Cape Survey 
    Seetha, S.; Ashoka, B. N.; Joshi, S.; Girish, V.; Sagar, R.; Chaubey, U. S.; Gupta, S. K. (2002)
    The Naini Tal-Cape survey has been initiated to search for pulsations in chemically peculiar A and F type stars. Many of the magnetic A peculiar type stars exhibit rapid oscillations with periods ranging from 4-16 minutes. ...
  • NGC 146: A young open cluster with a Herbig Be star and intermediate mass pre-main sequence stars 
    Subramaniam, A.; Sahu, D. K.; Sagar, R.; Vijitha, P. (2005)
    We present UBV CCD photometry and low-resolution spectra of stars in the field of the young open cluster NGC 146.We estimated 10–16 Myr as the turn-off age for the upper main sequence of the cluster using isochrones and ...
  • SS 433: Results of a recent multiwavelength campaign 
    Chakrabarti, S. K.; Anandarao, B. G.; Pal, S.; Mondal, S.; Nandi, A.; Bhattacharyya, A.; Mandal, S.; Sagar, R.; Pandey, J. C.; Pati, A.; Saha, K. (2005)
    We conducted a multiwavelength campaign in 2002 September–October, to observe SS 433. We used the Giant Meter Radio Telescope for radio observations, the Physical Research Laboratory Infrared Telescope at Mt Abu for infrared ...
  • On the analysis of light curves in asteroseismology 
    Mary, D. L. (2005)
    We provide a detailed introduction to the main problems arising when analyzing light curves in asteroseismology. Attention is first paid to the signal model delivered by the pulsating stars and to the noise sources corrupting ...

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