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2 results

  • The origin of the most luminous Planetary Nebulae

  • Rebeca Galera-Rosillo, Romano L. M. Corradi, Bruce Balick, Karen Kwitter, Antonio Mampaso, Jorge García-Rojas
  • Journal:
    Proceedings of the International Astronomical Union / Volume 12 / Issue S323 / October 2016
    Published online by Cambridge University Press:
    08 August 2017, pp. 386-387
    Print publication:
    October 2016
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  • As part of a systematic effort to characterize the properties and progenitors of the most luminous planetary nebulae (PNe), we obtained a sample among the brightest PNe in two stellar systems of different metallicities: LMC (Z/Z⊙~0.5) and M31 (Z/Z⊙~1) by means of a combined effort with the VLT and the 10mGTC. Modelling of these data will allow us to infer the masses of the stellar progenitors, gaining insights into the controversial origin of the universal cutoff of the Planetary Nebulae Luminosity Function (PNLF).

  • Abundances of Disk PNe in M31 and the radial oxygen gradient

  • Karen B. Kwitter, Emma M. M. Lehman, Bruce Balick, Richard B. C. Henry
  • Journal:
    Proceedings of the International Astronomical Union / Volume 7 / Issue S283 / July 2011
    Published online by Cambridge University Press:
    30 August 2012, pp. 416-417
    Print publication:
    July 2011
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  • We have obtained spectra of 16 PNe in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them with previous M31 PN disk measurements and with PNe in the Milky Way. We also derive the radial oxygen gradient in M31, which is shallower than that in the Milky Way, even accounting for M31's larger disk scale length.