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Browsing by Subject "Stellar Spectrophotometry"

Browsing by Subject "Stellar Spectrophotometry"

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  • The chemical composition of algol systems. III - Beta Lyrae-nucleosynthesis revealed 
    Balachandran, S; Lambert, D. L; Tomkin, J; Parthasarathy, M (Royal Astronomical Society, 1986-04)
    The B8 primary of the eclipsing binary star Beta Lyr is subjected to high S/N ratio Reticon observations of the visible and near-IR lines of He, C, N, O, Ne, and Fe, in order to determine their abundances. N is noted to ...
  • A compilation of physical parameters of AP and AM stars as derived from energy distribution studies 
    Babu, G. S. D; Shylaja, B. S (Kluwer Academic Publishers, 1981-09)
    The physical parameters, such as the effective temperatures, radii, bolometric magnitudes and bolometric corrections of 87 Ap and Am stars out of the 125 compiled here are essentially based on the work done by the authors ...
  • Epsilon Aurigae in eclipse. I - Ultraviolet spectroscopy during INGRESS and totality 
    Parthasarathy, M; Lambert, D. L (Astronomical Society of the Pacific, 1983-12)
    Epsilon Aurigae is a long-period eclipsing system containing a F0 Ia supergiant and an unseen slightly less-massive secondary. A primary eclipse began in mid-1982 with the unseen companion passing in front of the supergiant. ...
  • Equivalent width of OI λ7774 and absolute magnitude relation for F and G supergiants 
    Kameswara Rao, N; Mallik, S. G. V (Royal Astronomical Society, 1978-04)
    Luminosity calibration is established for F5-G2 supergiants using the equivalent width measures of OI λ7774 and FeI λ7748
  • Flare-like activity in Be stars HR 7403 and .8762 
    Ghosh, K. K (D. Reidel Publishing Co., 1989-05)
    Results are presented from rapid spectrophotometric observations of the Be stars HR 7403 and HR 8762. The observations were conducted between November, 1984 and December, 1985. No ultrarapid variations were detected in the ...
  • Geometry effects on the formation of the hydrogen Ly-alpha line in planetary nebulae 
    Peraiah, A; Wehrse, R (European Southern Observatory, 1977-12)
    In order to study the effects of sphericity on the radiative transfer in the hydrogen Ly alpha line of planetary nebulae, the radiation field in this line is calculated for static pure hydrogen models with ratios of outer ...
  • The H-alpha line profile in early type-binary systems HD 47129 and Gamma Velorum 
    Rajamohan, R (Kluwer Academic Publishers, 1984-02)
    A brief description of the variation of the Hα line profile in γ Velorum and HD 47129 is given.
  • HD 147010:The AP star in the reflection nebula vdB 102 in upper scorpius region 
    Kameswara Rao, N; Rajamohan, R (Indian Academy of Sciences, 1982-09)
    HD 147010, which is in the reflection nebula vdB 102, has been found to be a hot Ap silicon star rather than a normal A supergiant. From the UBV and JHK photometry of the star, color excess E(B-V) of 0.29 and the ratio of ...
  • HD 81410 - A new RS CVn binary 
    Raveendran, A. V; Mekkaden, M. V; Mohin, S (Royal Astronomical Society, 1982-05)
    B and V photometry of HD 81410 obtained on 34 nights between January 3 and March 14 of 1981 is presented. In both B and V, the amplitudes are found to be approximately 0.15 mag. It is also found that a 12.86833 day period ...
  • High speed photometry of dwarf nova EX Hydrae 
    Sharma, D. P; Marar, T. M. K; Seetha, S; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (INSDOC, 1983-08)
    High speed optical photometric observations of the hard X-ray source EX Hya, carried out with the reflector of the Kevalur Observatory, are presented. The observations with time resolutions of 1 s or 2 s were made on four ...
  • Observations of hydrogen deficient binary Upsilon Sagittarii 
    Kameswara Rao, N; Venugopal, V. R (Indian Academy of Sciences, 1985-06)
    The absolute magnitude M(v) of the hydrogen deficient binary Upsilon Sgr has been estimated as -4.8 + or - 1.0 from the distribution of the interstellar reddening, polarization, and interstellar lines of the surrounding ...
  • On the infrared bands of a A10 related to Mira phenomena 
    Murty, P. S (D. Reidel Publishing Company, 1978-04)
    The calculated band positions and intensity factors for the bands of the infrared A-X transition of A10 suggest that an investigation for the infrared bands in the 1 to 5 micron region of the spectra of Mira stars and M ...
  • On the intrinsic rotation of magnetic variables 
    Rajamohan, R; Babu, G. S. D (Royal Astronomical Society, 1978-03)
    It is observed that the rotational velocities of most Ap stars are dependent on their masses. Deviations from this general rule may be explained in terms of multiplicity which affects the derived colors and radii. Spectroscopic ...
  • Optical colours and polarization of a model reflection nebula. II. Silicate and graphite grains in a nebula with the star in the rear 
    Shah, G. A (WILEY-VCH Verlag Berlin GmbH & Co, 1977)
    The colour difference between the star and the attendant reflection nebula and polarization both caused by silicate and graphite grains have been given. The properly normalized size distribution function for each type of ...
  • Orbit of the spectroscopic binary B Persei 
    Rajamohan, R; Parthasarathy, M (Indian Academy of Sciences, 1975-04)
    Spectroscopic orbital elements are derived for the close binary system b Persei on the basis of forty spectrograms. The period is redetermined as 1.527360 days, and variations in the orbital elements are confirmed by ...
  • Photometric and radial velocity variations of RCrB near maximum light 
    Raveendran, A. V; Ashoka, B. N; Kameswara Rao, N (D. Reidel Publishing Co, 1986)
    Fourier analysis of the light curves of R CrB in the V band near maximum shows that in addition to several significant short periods there is a modulation of the visual light with a period around 1170 days, similar to that ...
  • Photometry of EX Hya 
    Shylaja, B. S (Kluwer Academic Publishers, 1985-04)
    Photometric observations of EX Hya in B and V filters are reported. The 67 min modulation of the light curve is also found to be in good agreement with the results of earlier studies. The (B-V) colour variation with respect ...
  • RS CVn-type variables. I - Photometry of HR 1099 
    Parthasarathy, M; Raveendran, A. V; Mekkaden, M. V (D. Reidel Publishing Co., 1981-01)
    Photometric observation of HR 1099 inV andB obtained on 18 nights between January and March 1977 is presented. The amplitude of the asymmetric light curve is found to be 0m.10±0m.004 both inV andB. On three occasions—namely, ...
  • SAO 75669: A late type giant behind the molecular cloud MBM 12 
    Bhatt, H. C; Sagar, R; Subramaniam, A; Gorti, U; Chandrasekhar, T; Ashok, N. M; Ragland, S (European Southern Observatory, 1994-09)
    Photometric and spectroscopic observations of the star SAO 75669 in the region of the high galactic latitude molecular cloud MBM 12 are presented. The optical, near-infrared and far-infrared IRAS photometric magnitudes ...
  • 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 ...

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