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The Origins of Planetary Nebulae in the Inner and Outer Disks of M 31

Published online by Cambridge University Press:  08 August 2017

Bruce Balick ,
Karen Kwitter ,
Romano Corradi ,
Rebeca Galera Rosillo  and
Richard Henry
Bruce Balick
Affiliation:
Astronomy Department, University of Washington, Seattle WA, 98195-1580, USA
Karen Kwitter
Affiliation:
Department of Astronomy, Williams College, Williamstown MA, 01267-2565, USA
Romano Corradi
Affiliation:
Gran Telescopio de Canarias, Center for Astrophysics in La Palma, S/C de Tenerife, E38712, Spain Departamento de Astrofisica, Universidad de La Laguna, La Laguna Tenerife, E-38206, Spain
Rebeca Galera Rosillo
Affiliation:
Departamento de Astrofisica, Universidad de La Laguna, La Laguna Tenerife, E-38206, Spain Instituto de Astrofisica de Canarias, La Laguna, Tenerife, E-38205, Spain
Richard Henry
Affiliation:
Richard Henry, H. L. Dodge Department of Physics & Astronomy, University of Oklahoma, Norman, OK 73019, USA
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Abstract

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The planetary nebulae (PNe) of M 31 are receiving considerable attention as probes of its structure and chemical evolution in a galactic environment that is putatively similar to the Milky Way. We have obtained deep spectra for about 30 luminous PNe in M 31’s inner disk and beyond (Rgal < 105 kpc). The entire ensemble of PNe exhibit O/H ~ 2/3 solar with no discernible radial gradient, in stark contrast to the H ii regions of M 31. This suggests that the outer PNe in M 31 formed from a common O-rich ISM at least 5 GY ago. We infer that the outer PNe and the underlying stellar population have little common history in M 31, and that the formation of the O-rich PNe preceded any putative encounter with M 33 ~2–3 Gy ago.

Keywords

planetary nebulae: generalgalaxies: abundancesgalaxies: halosISM: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S323: Planetary Nebulae: Multi-Wavelength Probes of Stellar and Galactic Evolution , October 2016 , pp. 264 - 268
Copyright
Copyright © International Astronomical Union 2017 

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