Masses of the planetary nebula central stars in the Galactic globular cluster system from HST imaging and spectroscopy

George H. Jacoby, Orsola De Marco, James Davies, I. Lotarevich, Howard E. Bond, J. Patrick Harrington, Thierry Lanz

Research output: Contribution to journalArticle

5 Citations (Scopus)
33 Downloads (Pure)

Abstract

The globular cluster (GC) system of our Galaxy contains four planetary nebulae (PNe): K 648 (or Ps 1) in M15, IRAS 18333-2357 in M22, JaFu 1 in Pal 6, and JaFu 2 in NGC 6441. Because single-star evolution at the low stellar mass of present-epoch GCs was considered incapable of producing visible PNe, their origin presented a puzzle. We imaged the PN JaFu 1 with the Hubble Space Telescope (HST) to obtain photometry of its central star (CS) and high-resolution morphological information. We imaged IRAS 18333-2357 with better depth and resolution, and we analyzed its archival HST spectra to constrain its CS temperature and luminosity. All PNe in Galactic GCs now have quality HST data, allowing us to improve CS mass estimates. We find reasonably consistent masses between 0.53 and 0.58 M for all four objects, though estimates vary when adopting different stellar evolutionary calculations. The CS mass of IRAS 18333-2357, though, depends strongly on its temperature, which remains elusive due to reddening uncertainties. For all four objects, we consider their CS and nebula masses, their morphologies, and other incongruities to assess the likelihood that these objects formed from binary stars. Although generally limited by uncertainties (∼0.02 M) in post-AGB tracks and core mass versus luminosity relations, the high-mass CS in K 648 indicates a binary origin. The CS of JaFu 1 exhibits compact, bright [O iii] and Hα emission, like EGB 6, suggesting a binary companion or disk. Evidence is weaker for a binary origin of JaFu 2.

Original languageEnglish
Article number93
Pages (from-to)1-10
Number of pages10
JournalAstrophysical Journal
Volume836
Issue number1
DOIs
Publication statusPublished - 10 Feb 2017

Bibliographical note

Copyright 2017 The American Astronomical Society. First published in the Astrophysical journal, 836(1), 93, 2017, published by IOP Publishing. The original publication is available at http://www.doi.org/10.3847/1538-4357/836/1/93. 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.

Keywords

  • globular clusters: general
  • planetary nebulae: individual (K648 Ps1 JaFu 1 JaFu 2 IRAS 18333-2357)

Fingerprint Dive into the research topics of 'Masses of the planetary nebula central stars in the Galactic globular cluster system from HST imaging and spectroscopy'. Together they form a unique fingerprint.

  • Cite this