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4 results

  • A survey for new PN in the southern galactic bulge

  • Sylvie F. Beaulieu, Michael A. Dopita, Kenneth C. Freeman, Agris J. Kalnajs
  • Journal:
    Symposium - International Astronomical Union / Volume 180 / 1997
    Published online by Cambridge University Press:
    25 May 2016, p. 405
    Print publication:
    1997
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  • We present the results of a deep and uniform narrow-band Hα imaging survey for planetary nebulae (PNe) in the southern galactic bulge. The goal of this survey was to obtain a sample of bulge tracers which is being used to study the dynamics of the Milky Way bulge (Beaulieu, 1996).

  • Halos and Disk Stability

  • Agris J. Kalnajs
  • Journal:
    Symposium - International Astronomical Union / Volume 117 / 1987
    Published online by Cambridge University Press:
    04 August 2017, pp. 289-299
    Print publication:
    1987
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  • The need for halos on stability grounds is not at all compelling. Compared to a bulge, a halo is not very efficient in stabilising a disk. Because the effect of a modest halo is small, it is difficult to infer its presence or absence from stability arguments.

  • Theory Of Spiral Structure

  • Agris J. Kalnajs
  • Journal:
    Symposium - International Astronomical Union / Volume 100 / 1983
    Published online by Cambridge University Press:
    04 August 2017, pp. 109-116
    Print publication:
    1983
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  • Spiral structure is associated with a slow redistribution of gas, which may already be quite significant over time scales short compared to the age of the galaxy. One has to worry about replacing the gas in order to keep the structure alive.

  • A Confrontation of Density Wave Theories with Observations

  • Agris J. Kalnajs
  • Journal:
    Symposium - International Astronomical Union / Volume 77 / 1978
    Published online by Cambridge University Press:
    14 August 2015, pp. 113-130
    Print publication:
    1978
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  • It would be a mistake to think that the density wave theories of spiral structure have reached the maturity where they can make unconditional predictions which can be tested. On the contrary, they are still very dependent on observations for help and guidance.