A study of H2 emission in three bipolar proto-planetary nebulae

IRAS 16594-4656, Hen 3-401, and Rob 22

Bruce J. Hrivnak, Nathan Smith, Kate Y L Su, Raghvendra Sahai

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We have carried out a spatial-kinematic study of three proto-planetary nebulae, IRAS 16594-4656, Hen 3-401, and Rob 22. High-resolution H2 images were obtained with NICMOS on the Hubble Space Telescope, and high-resolution spectra were obtained with the Phoenix spectrograph on Gemini-South. IRAS 16594-4656 shows a "peanutshaped" bipolar structure with H2 emission from the walls and from two pairs of more distant, point-symmetric faint blobs. The velocity structure shows the polar axis to be in the plane of the sky, contrary to the impression given by the more complex visual image and the visibility of the central star, with an ellipsoidal velocity structure. Hen 3-401 shows the H2 emission coming from the walls of the very elongated, open-ended lobes seen in visible light, along with a possible small disk around the star. The bipolar lobes appear to be tilted 10°-15° with respect to the plane of the sky, and their kinematics display a Hubble-like flow. In Rob 22, the H2 appears in the form of an "S"-shape, approximately tracing out the similar pattern seen in the visible. H2 is especially seen at the ends of the lobes and at two opposite regions close to the unseen central star. The axis of the lobes is nearly in the plane of the sky. Expansion ages of the lobes are calculated to be ∼1600 yr (IRAS 16594-4656), ∼1100 yr (Hen 3-401), and ∼640 yr (Rob 22), based on approximate distances.

Original languageEnglish (US)
Pages (from-to)327-343
Number of pages17
JournalAstrophysical Journal
Volume688
Issue number1
DOIs
StatePublished - Nov 20 2008
Externally publishedYes

Fingerprint

planetary nebulae
Infrared Astronomy Satellite
lobes
velocity structure
sky
kinematics
stars
image resolution
visibility
Phoenix (AZ)
high resolution
tracing
Hubble Space Telescope
spectrographs
expansion

Keywords

  • Circumstellar matter
  • Infrared: stars
  • ISM: individual (Hen 3-401, IRAS 16594-4656, Rob 22)
  • Planetary nebulae: general
  • Stars: AGB and post-AGB
  • Stars: mass loss

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

A study of H2 emission in three bipolar proto-planetary nebulae : IRAS 16594-4656, Hen 3-401, and Rob 22. / Hrivnak, Bruce J.; Smith, Nathan; Su, Kate Y L; Sahai, Raghvendra.

In: Astrophysical Journal, Vol. 688, No. 1, 20.11.2008, p. 327-343.

Research output: Contribution to journalArticle

Hrivnak, Bruce J. ; Smith, Nathan ; Su, Kate Y L ; Sahai, Raghvendra. / A study of H2 emission in three bipolar proto-planetary nebulae : IRAS 16594-4656, Hen 3-401, and Rob 22. In: Astrophysical Journal. 2008 ; Vol. 688, No. 1. pp. 327-343.
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