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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Kameswara Rao, N; Lambert, D. L; Shetrone, M. D (Blackwell Publishing, 2006-08)
    A set of five high-resolution optical spectra of R CrB obtained in 2003 March is discussed. At the time of the first spectrum (March 8), the star was at V = 12.6, a decline of more than six magnitudes. By March 31, the ...
  • Lambert, D. L; Kameswara Rao, N (Indian Academy of Sciences, 1994-03)
    This review presents a selection of recent highlights of observations of R Coronae Borealis (RCB) variables. Emphasis is placed on an abundance analysis of a complete sample (18 stars) of the warm galactic RCBs. It is shown ...
  • Asplund, M; Gustafsson, B; Lambert, D. L; Kameswara Rao, N (European Southern Observatory, 2000-01)
    An abundance analysis of the H-deficient and He- and C-rich R Coronae Borealis (R CrB) stars has been undertaken to examine the ancestry of the stars. The investigation is based on high-resolution spectra and line-blanketed ...
  • Kameswara Rao, N; Reddy, B. E; Lambert, D. L (Blackwell Publishing, 2004-12)
    Two high-resolution optical spectra of the R Coronae Borealis (R CrB) star UW Cen in decline are discussed. A spectrum from mid-1992 when the star had faded by 3 mag shows just a few differences with the spectrum at maximum ...
  • Pandey, G; Lambert, D. L; Kameswara Rao, N; Gustafsson, B; Ryde, N; Yong, D (Royal Astronomical Society, 2004-09)
    Spectra of several R Coronae Borealis (RCB) stars at maximum light have been examined for the [CI] 9850- and 8727-Åabsorption lines. The 9850-Åline is variously blended with an FeII and CN lines, but positive identifications ...
  • Sneden, C; Parthasarathy, M (American Astronomical Society, 1983-04)
    Atomic nuclei generated by s(low) and r(apid) fluxes of neutrons carry important information about the very late stages of stellar evolution in the Galaxy. The classic method of tracing the stellar nucleosynthesis sites ...
  • Kochhar, R. K (Indian Academy of Sciences, 1990-01-10)
  • Messina, S; Distefano, E; Parihar, P. S; Busa, I; Cutispoto, G; Lanza, A.F; Lanzafame, A; Pagano, I; Biazzo, K; Leto, G; Hatzidimitriou, D; Kim, S. -L; Koo, J. -R; Kang, Y. B (American Institute of Physics, 2009)
    The RACE‐OC project, standing for Rotation and Activity Evolution in Open Clusters, is a long‐term project aimed at studying the evolution of rotation and magnetic activity of late‐type members of stellar open clusters. ...
  • Messina, S; Parihar, P. S; Koo, J. R; Kim, S. L; Rey, S. C; Lee, C. U (EDP Sciences, 2010-04)
    Rotation and magnetic activity are intimately linked in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on stellar rotation, and rotation itself is strongly influenced ...
  • Messina, S; Distefano, E; Parihar, P. S; Kang, Y. B; Kim, S. -L; Rey, S. -C; Lee, C. -U (EDP Sciences, 2008-05)
    Context. Rotation and solar-type magnetic activity are closely related to each other in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on star's rotation, and rotation ...
  • Snehalata Sahu; Subramaniam, A (Cambridge University Press, 2019-05)
    We present the results obtained from Near-UV observations of the cluster NGC 5466 taken with UVIT onboard AstroSat to study the radial distribution of Blue Straggler Stars (BSSs), covering the cluster region up to a radius ...
  • Sagar, R; Bhatt, H. C (Indian Academy of Sciences, 1989-06)
    Mass segregation in the form of preferential concentration of more massive stars in the central regions of a number of open star clusters has been known for some time. In this paper, integrated UBV colors in concentric ...
  • Datta, B; Hasan, S. S; Sahu, P. K; Prasanna, A. R (World Scientific Publishing Company, 1998-02)
    Eigenfrequencies of radial pulsations of "slowly" rotating neutron stars are calculated in a general relativistic formalism given by Chandrasekhar and Friedman (1972). It is found that the square of the frequencies are ...
  • Evershed, John (Indian Institute of Astrophysics, Bangalore, 1909-02-03)
  • Prabhu, T. P (Indian Institute of Astrophysics, 1978)
    The radial velocities of 7 Sersic galaxies are reported. Three out of these (NGC 2903, 2997 and 5236) have published radial velocities prior to this work while the radial velocities of four remaining galaxies (NGC 922, ...
  • Deepak; Reddy, B. E (IOP Publishing, 2018-10)
    Here, we report a comparative study of radial velocity (RV) data of two major surveys: Gaia Data Release 2 and RAVE Data Release 5. We restricted the sample to stars with relatively accurate RVs. The difference between ...
  • Ramanathan, A. S (Springer-Verlag, 1954)
    The ratio of umbral intensity to photospheric intensity as a function of wavelength has been studied in the case of four fairly large spots in the wavelength range 4000A - 6500A. The relative spectrophotometric gradient ...
  • Krishan, V (Institute of Physics, 1980-08)
    The possibility of direct generation of electromagnetic radiation at and near electron plasma frequency from an electron beam-magnetoplasma system is explored. The role of the electron beam is replaced by the electron ...
  • Bertotti, B; Sivaram, C (Springer, 1991-11)
    The «fifth-force» field, if it exists, has radiative effects in competition with the gravitational radiation. Since this field violates the Principle of Equivalence, it may affect a gravitational wave detector more than a ...
  • Peraiah, A (Indian Institute of Astrophysics, 1979-11)
    The effects of large scales gas motions on the radiation pressure in a resonance lines are investigated. We have assumed a medium with pure scattering together with emission in the continuum. A linear velocity law is ...

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