Publications of Astronomical Society of India: Recent submissions

  • Mapping of the Orion molecular cloud in the [CII] line and continuum at 158 μm 
    Mookerjea, B; Ghosh, S. K; Kaneda, H; Nakagawa, T; Ojha, D. K; Rengarajan, T. N; Shibai, H; Verma, R. P (Astronomical Society of India, 2001)
    A fabry Perot Spectrometer (FPS) tuned to the astrophysically interesting (CII) line at 157.7409 µm, developed at ISAS (Japan) has been successfully interfaced to the TIFR 100 cm far-infrared balloon borne telescope. A ...
  • Far infrared mapping of three galactic star forming regions 
    Ghosh, S. K; Mookerjea, B; Rengarajan, T. N; Tandon, S. N; Verma, R. P (Astronomical Society of India, 2001)
    Three Galactic star forming regions in the northern sky, viz., associated with W3(OH), S209 and S187 have been simultaneously mapped in two trans-IRAS far infrared (FIR) bands centered at ~ 140 and 200 μm using the TIFR ...
  • Near IR study of the young cluster NGC 2453 
    Hasan, P; Kilambi, G. C; Baliyan, K. S (Astronomical Society of India, 2001)
    In an attempt to understand early phases of stellar evolution and star formation, we have taken up the study of extremely young star clusters in the near infrared wavebands. These clusters are deeply embedded inside the ...
  • Photometric study of the short period W UMa system - FZ Orionis 
    Rukmini, J; Vivekananda Rao, P; Ausekar, B. D (Astronomical Society of India, 2001)
    Photoelectric B, V observations of the eclipsing binary system FZ Orionis obtained from the Japal-Rangapur Observatory during the years 1981 to 1992 are presented and studied. No period changes in the system are detected. ...
  • Long-term study of the starspot activity on the eclipsing short-period RS Canum Venaticorum binary UV Piscium 
    Radhika, P; Vivekananda Rao, P (Astronomical Society of India, 2001)
    We present optical photometry of the short-period eclipsing RS CVn system, UV Piscium for the years 1966-1984. For each light curve, we model the distortion waves in order to study the behaviour of starspots in this system. ...
  • Kinematics of Vega-like stars 
    Manoj, P; Bhatt, H. C (Astronomical Society of India, 2001)
    We have studied the kinematics of Vega-like stars in the solar neighbourhood. Space velocities are computed for 80 Vega-like stars. We analyse the space velocities of these stars in connection with the young stellar ...
  • 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 (Astronomical Society of India, 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 ...
  • HD 12098 a new far-northern roAp star 
    Girish, V; Joshi, S; Seetha, S; Ashoka, B. N; Martinez, P; Chaubey, U. S; Gupta, S. K; Kurtz, D. W; Sagar, R (Astronomical Society of India, 2001)
    The rapidly oscillating Ap (roAp) stars are cool, magnetic, chemically peculiar stars which pulsate in non-radial p-modes in the period range 4-16 min and have Johnson B amplitudes less than 8 mmag. "The NainiTal-Cape ...
  • 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 (Astronomical Society of India, 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 2000. ...
  • A high resolution spectroscopic study of XX Ophiuchi 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of India, 2001)
    The star XX Oph has been known to exhibit peculiar spectral variabilities since the work of Merrill in 1924. A high resolution spectroscopic study of the XX Oph spectra taken in July 1996 and later in June 1997 also exhibit ...
  • A Li-rich post-AGB star HD 172481 
    Giridhar, S; Arellano Ferro, A; Mathias, P (Astronomical Society of India, 2001)
    Our abundance analysis of this post-AGB candidate star confirms that the HD 172481 is indeed a post-AGB star. It belongs to an important, but relatively rare class of post-AGB stars showing Li I features in their spectra. ...
  • Gamma-ray astronomy activities in BARC - an introductory note 
    Razdan, H (Astronomical Society of India, 1997)
  • Averaging problem in general relativity, macroscopic gravity and using Einstein's equations in cosmology 
    Zalaletdinov, R. M (Astronomical Society of India, 1997)
    The averaging problem in general relativity is briefly discussed. A new setting of the problem as that of macroscopic description of gravitation is proposed. A covariant space-time averaging procedure is described. The ...
  • Entropy of the gravitational field 
    Rothman, Tony; Anninos, Peter (Astronomical Society of India, 1997)
    We develop a formulation of the entropy of the gravitational field by adopting the statistical mechanics expression for entropy S = lnΩ, where Ω is the phase space of the field bounded by a Hamiltonian. Phase space is ...
  • Tilt of COBE can constrain aspects of superstring geometry 
    Sivaram, C (Astronomical Society of India, 1997)
    Superstring theories for which experimental evidence is meagre are considered a most promising approach to understand the quantum nature of gravity and its unification with other fundamental interactions. The geometric ...
  • Performance of a speckle interferometer 
    Saha, S. K; Jayarajan, A. P; Sudheendra, G; Chandra, A. U (Astronomical Society of India, 1997)
    An interferometer system for use at the 2.34 meter Vainu Bappu Telescope (VBT), situated at Vainu Bappu Observatory (VBO), Kavalur, to obtain speckle-grams of astronomical objects in the visible wavelength, has been ...
  • Solar log gf values in the infrared J and H bands 
    Stalin, C. S; Trivedi, C; Sinha, K; Sanwal, B. B (Astronomical Society of India, 1997)
    Solar IR spectra have been utilized to derive log gf values 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 ...
  • Infrared and H-alpha emission from Be stars 
    Apparao, K. M. V; Tarafdar, S. P (Astronomical Society of India, 1997)
    It was noted earlier by several authors that the infrared excess Hα emission observed from Be stars are not compatible with the idea that both emissions occur from these same optically thin ionised region. We show here ...
  • On Alfvén wave damping in polar coronal holes 
    Narain, U; Sharma, R. K; Vekstein, G (Astronomical Society of India, 1997)
    We reexamine quantitatively the linear resistive and viscous damping of Alfven waves propagating in solar coronal holes, using recently reported observational data on the plasma density and temperature there as well as ...
  • Blind iterative deconvolution of binary star images 
    Saha, S. K; Venkatakrishnan, P (Astronomical Society of India, 1997)
    The technique of Blind Iterative De-convolution (BID) was used to remove the atmospherically induced point spread function (PSF) from short exposure images of two binary stars, HR 5138 and 5747 obtained at the cassegrain ...

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