IIA Institutional Repository

Browsing by Author "Jain, S. K"

Browsing by Author "Jain, S. K"

Sort by: Order: Results:

  • Measurements of linear polarization of some Herbig Ae/Be stars 
    Jain, S. K; Bhatt, H. C; Sagar, R (The American Physical Society, 1990-05)
    The linear polarization of eight bright Herbig Ae/Be stars in UBVRI bands has been measured. No unique wavelength dependence of polarization magnitude or direction is found in these measurements. Comparison with earlier ...
  • Morphology of the bipolar planetary nebula NGC 2346 from emission line profile studies 
    Anandarao, B. G; Banerjee, D. P. K; Desai, J. N; Jain, S. K; Mallik, D. C. V (Royal Astronomical Society, 1988-11)
    High resolution observations of H-alpha 6563-A, forbidden O-III 5007 A, and forbidden N-II 6583-A emission lines in the bipolar planetary nebula NGC 2346 are presented. From the widths of the alpha and forbidden N-II lines, ...
  • On the absorption of He I 10830 Å line by spicules 
    Venkatakrishnan, P; Jain, S. K (Astronomical Society of India, 1983)
    The possible applications of the time-dependent measurements of the equivalent width of the He I 10830 A line for a better understanding of the growth of spicules and the evolution of coronal holes and x-ray bright points ...
  • Polarization Maps for the Dark Clouds B:227 and L:121 
    Bhatt, H. C; Jain, S. K (European Southern Observatory, 1993-09)
    Optical linear polarization measurements for stars in the regions of the molecular clouds B 227 and L 121 are presented. The magnetic field geometry in the clouds as indicated by the polarization maps is discussed in ...
  • Polarization Measurements of Post-Asymptotic Giant Branch Candidates and Related Stars 
    Parthasarathy, M; Jain, S. K; Sarkar, G (The American Astronomical Society, 2005-05)
    We have obtained UBVRI polarization measurements of 26 post-asymptotic giant branch (post-AGB) candidates and related stars. The extremely metal-poor post-AGB star HR 4049 has been observed several times. In most cases we ...
  • Polarization Measurements of Some Herbig Ae / Be-Stars 
    Jain, S. K; Bhatt, H. C; Sagar, R (International Astronomical Union, 1990)
    We have measured the linear polarization of 8 bright Herbing Ae/ Be starsin UBVRI bands. No unique wavelength dependence of magnitude as well as direction is found on these measurements.
  • Polarization measurements of stars in the region of the nearby molecular cloud MBM 12 
    Bhatt, H. C; Jain, S. K (Blackwell Publishing, 1992-07)
    Linear polarization measurements of stars in the region of the nearby high-latitude molecular cloud MBM 12 are presented. Stars behind the cloud show a polarization of about 2-3 percent, while stars that are in front of ...
  • Polarization measurements of the luminous blue variable HR Carinae 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (European Southern Observatory, 2000-03)
    We have made BVRI polarization measurements of HR Car on ten occasions during the period JD 2447919 to JD 2449014. All our observations are on the rising part of the light curve. We find the presence of intrinsic variable ...
  • Possible young stellar objects in the region of the Cygnus OB2 (VI Cygni) association from IRAS observations 
    Parthasarathy, M; Jain, S. K; Bhatt, H. C (EDP Sciences, 1992-12)
    Several massive young stellar objects are found from an analysis of the 12- to 100-micron flux data of IRAS sources in the region of the Cyg OB2 association. Sixty-four sources with positive spectral indices and steeply ...
  • The Puppis OB III association: polarization measurements 
    Bhatt, H. C; Jain, S. K; Sagar, R (European Southern Observatory, 1998-03)
    Optical linear polarization measurements of association members and field stars in the region of the Puppis OB III association are presented. The association members are found to have larger values of polarization than the ...
  • A rapid scan Fourier transform infrared spectrometer 
    Jain, S. K; Smyth, M. J (Astronomical Society of Indian, 1988-12)
    A rapid scan Fourier transform spectrometer for astronomical infrared spectroscopy, tested at the Cassegrain focus of the 102 cm telescope at Kavalur, is described. The design of the fore-optics and the performance of the ...
  • Red and reddened stars in the region of Cygnus OB2 (VI Cygni) association 
    Parthasarathy, M; Jain, S. K (European Southern Observatory, 1995-06)
    From an ultra-low dispersion spectroscopic survey of the Cyg OB2 association several red and reddened stars are detected. Most of these stars appear to be reddened early-type stars belonging to the Cygnus OB2 association. ...
  • A Single-Cell Photopolarimeter 
    Jain, S. K; Bhattacharyya, J. C (Indian Institute of Astrophysics, Bangalore, 1987-02)
    A simple, single-cell photopolarimeter has been developed for use at the cassegrain focus of the 102 cm Ritchey-Chretien reflector at Kavalur. The design and performance of the instrument are discussed
  • A Single-Channel Polarimeter 
    Jain, S. K; Bhattacharyya, J. C (International Astronomical Union, 1986)
    The authors have developed a single-channel photopolarimeter to measure polarization to ≡1%, with an accuracy of 0.1%. Laboratory tests show that the performance of the instrument matches the requirements.
  • Spatio-temporal fluctuations in He I 10830 A line parameters - Evidence for spicule formation 
    Venkatakrishnan, P; Jain, S. K; Singh, J; Recely, F; Livingston, W. C (Springer Netherlands, 1992-03)
    The equivalent width, line depth, line width, and Doppler shift of the He i 10830 Å line were extracted from two time series of spectra. Scatter plots of time-averaged line depth, line width, and Doppler shifts, as well ...
  • Spectral evolution of nova V443 Scuti 1989 
    Anupama, G. C; Duerbeck, H. W; Prabhu, T. P; Jain, S. K (European Southern Observatory, 1992-09)
    Spectroscopy of the moderately fast nova V443 is presented. Observations were made during the brightness fluctuations following maximum and during the transition stage. A few broadband polarimetric observations are also ...
  • A star-and-sky chopping polarimeter: design and performance 
    Jain, S. K; Srinivasulu, G (SPIE, 1991-10)
    The authors have developed a star-and-sky chopping polarimeter for accurate measurements of linear polarization of starlight in the standard astronomical photometric U, B, V, R, and I bands. The instrumental polarization, ...
  • Study of variability of the polarization in Herbig Ae/Be stars 
    Jain, S. K; Bhatt, H. C (European Southern Observatory, 1995-06)
    We report our measurements of linear polarization of a number of Herbig Ae/Be stars made at several epochs during the period 1989-1993. These results together with the observations compiled from the published sources have ...
  • Time variability of the He I 10830 A line profile 
    Singh, J; Jain, S. K; Venkatakrishnan, P (Springer, 1994-03)
    We have studied the time-dependent behavior of the He I 10830 A line. These studies show that (1) the fluctuations of the line width are uncorrelated with the equivalent-width fluctuations and (2) the autocorrelation curves ...
  • UBVRI polarization measurements of POST AGB Stars 
    Parthasarathy, M; Jain, S. K (International Astronomical Union, 1993)

Search DSpace

Browse

My Account