IIA Institutional Repository

Browsing by Subject "Stellar Mass"

Browsing by Subject "Stellar Mass"

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  • Capture of field stars by molecular clouds 
    Bhatt, H. C (European Southern Observatory, 1989-04)
    Field stars can be captured by massive interstellar clouds. Stars encounter interstellar clouds with relative velocities that have a distribution. Close encounters in which stars enter a cloud with relative velocities less ...
  • Classical Cepheids and the local chemical inhomogeneities in the galactic disc 
    Giridhar, S (1986-06)
    Places of formation have been derived for a sample of 23 Cepheids with well-determined atmospheric abundances in an attempt to study the chemical inhomogeneities in the local interstellar medium. The abundance data available ...
  • Distribution of stars perpendicular to the plane of the Galaxy 
    Chatterjee, S (Indian Academy of Sciences, 1991-12)
    A detailed calculation is given of the distribution of mass above the Galactic plane for any arbitrary mass distribution and velocity distribution. It is shown that an analytic expression can be found for the gravitational ...
  • A general upper limit on the mass and entropy production of a cluster of supermassive objects 
    Sivaram, C (Springer, 1982-09)
    A general upper limit is obtained on the mass of a cluster of pregalactic supermassive stars, along with the entropy of the radiation they produce, in view of the suggestion that they account for some or even all of the ...
  • 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 ...
  • Internal kinematics of open star clusters 
    Sagar, R; Bhatt, H. C (Royal Astronomical Society, 1989-02)
    Proper motion measurements are employed to investigate the internal kinematics of eight open star clusters. In most of the clusters considered, no dependence of the intrinsic dispersion in proper motion on stellar mass and ...
  • Limits on rotation-induced characteristics of radiation from stable rapidly rotating neutron stars 
    Datta, B; Kapoor, R. C (The American Astronomical Society, 1988-08)
    Results are presented of a study of frequency shifts in radiation from the surface of rapidly rotating neutron stars and rotation-induced spectral line broadening as a function of their mass. It is found that, despite large ...
  • Lower bounds on neutron star mass and moment of inertia implied by the millisecond pulsar 
    Datta, B; Ray, A (The Royal Astronomical Society, 1983-08)
    The short period of the millisecond pulsar PSR 1937+214 implies that it could be close to the onset of rotational instabilities. Conditions of rotational stability imply lower bounds on the mass and moment of inertia and ...
  • On the Balmer progression in the expanding shell of Pleione 
    Peraiah, A (Indian Academy of Sciences, 1982-09)
    An attempt has been made to explain the Balmer progression in velocities seen in Pleione and other shell stars. Equations of conservation of mass and momentum are simultaneously solved with assumptions which simplify the ...
  • On the consequences of a new initial-final mass relation for low and intermediate mass stars and the birthrate of planetary nebulae 
    Mallik, D. C. V (Gordon and Breach Science Publishers, 1985)
    Recent work on the initial-final mass relation for low-and intermediate-mass stars and the mass distribution of the nuclei of planetary nebulae sets a lower limit on the initial mass of progenitors of PN which is substantially ...
  • On the consequences of a new initial-final mass relation for low and intermediate mass stars and the birthrate of planetary nebulae 
    Mallik, D. C. V (Gordon Breach Science Publisher Ltd, 1985)
    Recent work on the initial-final mass relation for low-and intermediate-mass stars and the mass distribution of the nuclei of planetary nebulae sets a lower limit on the initial mass of progenitors of PN which is substantially ...
  • Planetary nebulae - Origin and evolution 
    Mallik, D. C. V (Astronomical Society of Australia, 1991)
    The review describes some of the progress made in observations and their interpretation, particularly in the context of the evolution of the nebulae and the central stars. It includes a discussion on the improved determinations ...
  • Re-analysis of close binary systems 
    Indulekha, K; Kundt, W; Shylaja, B. S (Kluwer Academic Publishers, 1990-10)
    The facts indicating that large line-forming regions occur among the best-studied close binaries are outlined. It is pointed out that emission lines are often redshifted while absorption lines are blueshifted, emission ...
  • A study of the spatial stellar mass distribution in some young open clusters 
    Sagar, R; Miakutin, V. I; Piskunov, A. E; Dluzhnevskaia, O. B (Royal Astronomical Society, 1988-10)
    The stellar spatial distribution is studied as a function of mass in 11 young open clusters. In seven of these clusters, mass segregation is observed. The possibility of two cluster centers for NGC 2264 is discussed. It ...
  • A study of the spatial variation of mass functions in some young open clusters 
    Pandey, A. K; Mahra, H. S; Sagar, R (Astronomical Society of the Pacific, 1991)
    The effect of mass segregation on cluster mass functions has been studied and it is found that the slope of the mass function is steeper in the outer parts of open dusters. Since dynamical relaxation time is always larger ...
  • Tidal disruption and tidal coalescence in binary stellar systems 
    Alladin, S. M; Parthasarathy, M (Royal Astronomical Society, 1978-09)
    Tidal effects in binary stellar systems are considered. The rate of increase of the binding energy of a component and the rate of decrease of the energy of the orbital motion of the binary are estimated under the simplifying ...
  • Upper mass limit for neutron star stability against black hole formation 
    Krishan, V; Kumar, N (D.Reidel Publishing Co.,, 1978-08)
    Starting from the exact general relativistic expression for the total energy of selfgravitating spherically distributed matter and using the minimum energy principle, we calculate the upper mass limit for a neutron star ...
  • Yields of nucleosynthesis from massive and intermediate mass stars and constraints on their final evolution 
    Mallik, D. C. V; Mallik, S. G. V (Indian Academy of Sciences, 1985-09)
    Nucleosynthetic yields and production rates of He and heavy elements are derived using recent revisions in O star counts and the stellar models of Maeder (1981). The current production rates and yields are significantly ...

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