A survey for planetary nebulae in M31 globular clusters

George H. Jacoby, Robin Ciardullo, Orsola De Marco, Myung Gyoon Lee, Kimberly A. Herrmann, Ho Seong Hwang, Evan Kaplan, James E. Davies

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We report the results of an [O III] λ5007 spectroscopic survey for planetary nebulae (PNe) located within the star clusters of M31. By examining R ∼ 5000 spectra taken with the WIYN+Hydra spectrograph, we identify 3 PN candidates in a sample of 274 likely globular clusters, 2 candidates in objects which may be globular clusters, and 5 candidates in a set of 85 younger systems. The possible PNe are all faint, between ∼2.5 and ∼6.8 mag down the PN luminosity function, and, partly as a consequence of our selection criteria, have high excitation, with [O III] λ5007 to Hβ ratios ranging from 2 to ≳ 12. We discuss the individual candidates, their likelihood of cluster membership, and the possibility that they were formed via binary interactions within the clusters. Our data are consistent with the suggestion that PN formation within globular clusters correlates with binary encounter frequency, though, due to the small numbers and large uncertainties in the candidate list, this study does not provide sufficient evidence to confirm the hypothesis.

Original languageEnglish
Article number10
Pages (from-to)1-14
Number of pages14
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 20 May 2013

Bibliographical note

Copyright 2013 The American Astronomical Society. First published in the Astrophysical journal, 769(1), 10, 2013, published by IOP Publishing. The original publication is available at http://www.doi.org/10.1088/0004-637X/769/1/10. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


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