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Browsing IIAP Publications by Title

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  • Quiescence of an outburst of a low-mass young stellar object: LDN1415-IRS 
    Singh, Koshvendra; Ojha, Devendra K.; Ninan, Joe P.; Sharma, Saurabh; Ghosh, Supriyo; Ghosh, Arpan; Bhatt, B. C; Sahu, D. K (Indian Academy of Sciences, 2023-12)
    LDN1415-IRS, a low-mass young stellar object (YSO), went into an outburst between 2001 and 2006, illuminating a surrounding nebula, LDN1415-Neb. LDN1415-Neb was found to have brightened by I=3.77 mag by April 2006. The ...
  • Quiet-Sun variability with the solar cycle 
    Kariyappa, R (Astronomical Society of the Pacific, 1999)
    In evaluating the contribution of various chromospheric features to total CaII K-emission flux and UV irradiance variability, the quiet-Sun is also one of the essential and important component. We have segregated the disc ...
  • R Coronae Borealis at the 2003 light minimum 
    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 ...
  • The R Coronae Borealis stars - A few mere facts 
    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 ...
  • The R Coronae Borealis stars - atmospheres and abundances 
    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 ...
  • R Coronae Borealis stars at minimum light - UW Cen 
    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 ...
  • The R Coronae Borealis stars: carbon abundances from forbidden carbon lines 
    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 ...
  • The r- and s-process nuclei in the early history of the galaxy - HD 122563 
    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 ...
  • R. LI. Jones-C. V. Raman's physics professor at presidency college Madras 
    Kochhar, R. K (Indian Academy of Sciences, 1990-01-10)
  • The RACE-OC project: Rotation and ACtivity Evolution in Open Clusters 
    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. ...
  • RACE-OC project: rotation and variability in the open cluster M 11 (NGC 6705) 
    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 ...
  • RACE-OC project: rotation and variability in the open cluster NGC 2099 (M 37) 
    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 ...
  • RAD@home citizen science discovery of an active galactic nucleus spewing a large unipolar radio bubble on to its merging companion galaxy 
    Hota, Ananda; Dabhade, Pratik; Vaddi, Sravani; Konar, Chiranjib; Pal, Sabyasachi; Gulati, Mamta; Stalin, C. S; Avinash, Ck; Kumar, Avinash; Rajoria, Megha; Purohit, Arundhati (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    Active galactic nucleus (AGN) feedback during galaxy merger has been the most favoured model to explain black hole–galaxy co-evolution. However, how the AGN-driven jet/wind/radiation is coupled with the gas of the merging ...
  • Radial distribution of Blue Stragglers in NGC 5466 using AstroSat 
    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 ...
  • Radial distribution of the integrated light and photometric colours in open star clusters 
    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 ...
  • Radial modes of rotating neutron stars in the Chandrasekhar-Friedman formalism 
    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 ...
  • Radial movement in Sunspots 
    Evershed, John (Indian Institute of Astrophysics, Bangalore, 1909-02-03)
  • Radial Sizes and Expansion Behavior of ICMEs in Solar Cycles 23 and 24 
    Mishra, Wageesh; Doshi, Urmi; Srivastava, Nandita (Frontiers, 2021-09)
    We attempt to understand the influence of the heliospheric state on the expansion behavior of coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) in solar cycles 23 and 24. Our study focuses on ...
  • Radial velocities of seven Sersic galaxies 
    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, ...
  • Radial velocity comparison of Gaia DR2 and RAVE DR5 survey: A systematic offset in radial velocities among a group of highly accurate radial velocity stars 
    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 ...

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