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Browsing IIAP Publications by Subject "Astronomical Photometry"

Browsing IIAP Publications by Subject "Astronomical Photometry"

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  • Abundance analysis of the long period southern Cepheid RZ Vel 
    Giridhar, S; Goswami, A; Arellano Ferro, A (Indian Academy of Sciences, 1991-03)
    An abundance analysis is conducted for the long period (P = 20.4 days), young classical Cepheid RZ Vel, a recognized member of an OB association. The results of the analysis are compared with the photometric study by Eggen ...
  • Comments on the variability and physical parameters of the F supergiant Phi Cassiopeiae 
    Ferro, A. A; Parrao, L; Giridhar, S (Astronomical Society of the Pacific, 1988-08)
    UBVRI and uvby photometry and radial velocities have been obtained for the F0 Ia supergiant Phi Cas. The variability is confirmed from the radial velocities; the velocity range is small (Delta V/subr of about 6 km/s). No ...
  • Dust and ionized gas in NGC 3607 
    Singh, K. P; Prabhu, T. P; Kembhavi, A. K; Bhat, P. N (The American Astronomical Society, 1994-04)
    We report the detection of a broad dust ring in the X-ray-bright elliptical galaxy NGC 3607, the dominant member of a nearby group of galaxies. The inner radius of the ring is approximately 1.3 kpc from the nucleus and has ...
  • Embedded clusters in giant extragalactic H II regions, 1: BVRH-alpha photometry 
    Mayya, Y. D (The American Astronomical Society, 1994-10)
    Photometry in BVR continuum bands and in the emission line of H-alpha+(N II) are presented for a sample of H II complexes in disk, spiral arm and nuclear regions of galaxies NGC 1365, 1566, 2366, 2903, 2997, 3351, 4303, ...
  • Emission band and continuum photometry of Comet West /1975n/. I - Heliocentric dependence of the flux in the emission bands and the continuum 
    Sivaraman, K. R; Babu, G. S. D; Bappu, M. K. V; Parthasarathy, M (Royal Astronomical Society, 1979-12)
  • Evolution of starspot regions in DM UMa 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V; Hall, D. S; Henry, G. W (Kluwer Academic Publishers, 1985-10)
    B andV photometry of DM UMa obtained between January, 1980 and June, 1984 is presented. Analysis yields a mean photometric period 7d.478±0d.010, compared to the known oribital period of 7d.492±0d.009. Light curves obtained ...
  • High speed photometry of PG 1012-029 
    Ashoka, B. N; Seetha, S; Marar, T. M. K; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (European Southern Observatory, 1994-03)
    High speed optical photometric observations of PG 1012 - 029, conducted during 1990-1991, confirm the nova-like classification of the object. Several eclipses observed by us have been used to refine the orbital period of ...
  • Kinematical distances to open star clusters 
    Sagar, R; Bhatt, H. C (Indian Academy Sciences, 1988-06)
    Kinematical distances are estimated for six open star clusters. They agree fairly well with the photometric distances. The kinematical distances cannot, at present, be estimated better than the photometric distances. When ...
  • Mutual phenomena of the Galilean satellites: an analysis of the 1991 observations from VBO 
    Vasundhara, R (European Southern Observatory, 1994-01)
    Results of analysis of seventeen mutual events, of the Galilean satellites, observed at the Vainu Bappu Observatory (VBO) during the 1991 are presented. The light curves were fitted with theoretical models to derive the ...
  • Narrow band photometry of selected asteroids 
    Rajamohan, R; Bhargavi, S. G (Lunar and Planetary Inst, 1992-12)
    The CCD photometry of selected asteroids was carried out to check for possible cometary activity in them. To distinguish the asteroids with possible cometary activity from those of the main belt, each object of interest ...
  • A new satellite of Uranus 
    Bhattacharyya, J. C; Kuppuswamy, K (Nature Publishing Group, 1977-05)
    During the observation of the occultation of the star SAO 158687 by Uranus on March 10, 1977, there occurred an unexpected event which suggests the existence of a hitherto unknown satellite of the planet. On the basis of ...
  • Optical CCD imaging of some Herbig Ae/Be stars 
    Bhatt, H. C; Sagar, R (EDP Sciences, 1992-02)
    Results of V, R, and H-alpha CCD imaging for 15 Herbig Ae/Be stars are presented. Light variations of more than about 2 mag in V have been noticed in stars T Ori, RR Tau, and LH-alpha 25. The nature of the variations in ...
  • Photometric calibration of the CCD camera of 1-m telescope at VBO 
    Mayya, Y. D (Indian Academy of Sciences, 1991-12)
    Calibration of the CCD camera of the 1-m telescope at the Vainu Bappu Observatory, Kavalur, to the BVR system is reported here based on the observations of stars in the 'dipper asterism' in the open cluster M 67 (NGC 2682). ...
  • A photometric study of F-type stars of high galactic latitude 
    Ferro, A. A; Giridhar, S; Chavez, M; Parrao, L (European Southern Observatory, 1989-04)
    Photometry in the O I 7774 A line and the uvbybeta system is presented for a group of high Galactic latitude F-type luminosity type I stars. The results indicate that the candidates are high gravity near solar Fe/H abundance ...
  • Photometry of intermediate polars AO PSC and V 1223 SGR 
    Padmini, V. N; Marar, T. M. K; Seetha, S; Padmanabhan, P; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Kuppuswamy, K; Rozario, M. J (Springer, 1985-12)
    We present optical photometric observations of the cataclysmic variables AO Psc and V 1223 Sgr, both of which are believed to contain slowly-rotating white-dwarf pulsars. These objectes belong to the new class of intermediate ...
  • SN 1993J in M 81: Optical photometry and spectrophotometry during the first two months 
    Prabhu, T. P; Mayya, Y. D; Singh, K. P; Kameswara Rao, N; Ghosh, K. K; Mekkaden, M. V; Pati, A. K; Raveendran, A. V; Reddy, B. E; Sagar, R; Subramaniam, A; Surendiranath, R (The European Southern Observatory, 1995-03)
    CCD photometric and spectrophotometric data on the type IIb supernova 1993J in M 81 (NGC 3031) obtained from Vainu Bappu Observatory, Kavalur, during the first two months since the outburst are reported. The evolution of ...
  • Spot activity in the RS CVn binary HR 1099 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Indian Academy of Sciences, 1982-03)
    UBV photometry of HR 1099 obtained during the 1979-80 and 1980-81 observing seasons is presented. An analysis of the available data shows that the brightness at the light curve maximum increases as the wave amplitude ...
  • A study of the open cluster NGC 2374 
    Babu, G. S. D (Indian Academy of Sciences, 1985-03)
    The results of modified objective grating observations and photoelectric as well as photographic photometry of the open cluster NGC 2374 are presented. The cluster contains at least twenty stars as definite members down ...
  • The Wilson-Bappu effect for Mg II k-line emission widths 
    Parthasarathy, M (D.Reidel Publishing, 1985)
    The existence of a tight linear correlation between the stellar absolute magnitude Mv and the Mg II k-line emission width log WMg II k (km s/sup-1) is confirmed using IUE high-resolution (0.2 Å) data for 100 late-type stars.

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