Planetary Nebulae and the Galactic Bulge

  • M. W. Feast
  • T. D. Kinman
  • B. S. Lasker
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)

Abstract

Fifteen new PN have been discovered in the region of Baade’s Windows using an objective prism technique. Absolute spectrophotometry, excitation classes, radii and radial velocities have been obtained. Radial velocities were also measured for eight other PN in this region. After correction for solar motion and the circular velocity at the sun, the radial velocities of bulge PN (Vc) with |b| < 5ọ5 show good evidence for a rotation of the bulge. If \({V_c} = \alpha + \beta \Delta \ell \) then, {tly|167-1} Ionized masses (Mi) for the new PN range over a factor ~ 50. These results and those of Gathier et al. (1983) show that \({M_i} < {\text{ }} \sim 0.3{\text{ }}{M_ \odot} \)in the bulge. This is in good agreement with the predictions of Feast and Whitelock (1987).;They find \({{\text{M}}_{{\text{Bol}}}} > - 4.7\)for bulge Miras and IRAS sources which together with pulsation masses and evolutionary theory leads to predicted nebular masses ~ 0.3 M⊙ and an evolutionary age of the most massive bulge objects of ~ 5 Gyr. The absence of high excitation planetaries in the bulge is consistent with the lack of younger (more massive) progenitors.

Keywords

Radial Velocity Evolutionary Theory Good Evidence Science Institute Astronomical Observatory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Feast, M.W. and Whitelock, P.A. 1987, in Lata Stages of Stellar Evolution, ed. S. Kwok and S.R. Pottasch (Dordrecht: D. Reidel), p. 33.CrossRefGoogle Scholar
  2. Gathier, R., Pottasch, S.R., Goss, W.M., and van Gorkom, J.H. 1983, Astron. Astrophus., 128, 325.ADSGoogle Scholar

Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • M. W. Feast
    • 1
  • T. D. Kinman
    • 2
  • B. S. Lasker
    • 3
  1. 1.South African Astronomical ObservatorySouth Africa
  2. 2.Kitt Peak National ObservatoryUSA
  3. 3.Space Telescope Science InstituteUSA

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