Kinematic structure of H 2 and [Fe II] in the bipolar planetary nebula M2-9

Nathan Smith, Bruce Balick, Robert D. Gehrz

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We present new high-dispersion, long-slit, infrared (IR) spectra of the double-shell bipolar planetary nebula M2-9 in the emission lines [Fe II] λ16435 and H 2 v = 1-0 S(1) λ21218. H 2 spectra reveal for the first time the kinematic structure of the outer shell in M2-9. Kinematics of the inner shell, traced by [Fe II], resemble those of optical forbidden lines like [N II] λ6583, although we note subtle differences. [Fe II] and H 2 shells have expansion speeds roughly proportional to distance from the star ("Hubble" flows) and share the same dynamical age of 1200-2000 yr, depending on the distance to M2-9. Thus, the inner ionized lobes and outer molecular lobes, as well as the molecular torus and "outer loops" measured by other observers, were all formed around the same time. Consequently, their nested structure likely arises from an excitation gradient rather than independent ejections. H 2 and [Fe II] emission is distributed more uniformly than [N II], and IR lines are not dominated by the moving ionization pattern like visual-wavelength lines. We suggest that this is because IR lines of [Fe II] and H 2 are excited by relatively isotropic far-UV radiation (Balmer continuum), whereas optical lines respond to a directed rotating beam of Lyman continuum. Finally, we highlight intriguing similarities between M2-9 and the Homunculus of η Car, despite the different central engines powering the two nebulae.

Original languageEnglish (US)
Pages (from-to)853-861
Number of pages9
JournalAstronomical Journal
Volume130
Issue number2
DOIs
StatePublished - Aug 1 2005

Keywords

  • Circumstellar matter
  • Planetary nebulae: general
  • Planetary nebulae: individual (M2-9)
  • Stars: evolution
  • Stars: mass loss

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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