Proper Motions in the Knotty, Bipolar Jet in Henize 2-90

Details Proper Motions in the Knotty, Bipolar Jet in Henize 2-90 Proper Motions in the Knotty, Bipolar Jet in Henize 2-90

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...573l.123s&link_type=abstract

The Astrophysical Journal, Volume 573, Issue 2, pp. L123-L127.

Astronomy and Astrophysics

Astronomy

19

Stars: Circumstellar Matter, Ism: Jets And Outflows, Ism: Planetary Nebulae: Individual: Alphanumeric: He 2-90, Stars: Agb And Post-Agb, Stars: Mass Loss, Stars: Winds, Outflows

Scientific paper

Using second-epoch Hubble Space Telescope imaging of the unusual, bipolar jet source He 2-90, we have discovered proper motions of 0.03" yr-1 in the jet knots. Combining the proper motion with the knots' radial velocity measured from ground-based long-slit data, we find that the jet speed is roughly 150-360 km s-1, the source distance is 1-2.5 kpc, and the inclination (to the sky plane) of the jet axis is θ=10deg-4deg, although smaller values of θ and larger values of the jet speed and distance are not ruled out. A comparison of the [O III] and [N II] images shows the central obscuring disk structure directly. The disk, seen nearly edge-on, is embedded within a low-excitation circumstellar region extending from the equator up to a latitudinal angle of about +/-62°, with the remaining latitudinal angular space being occupied by a biconical high-excitation region whose symmetry axis is aligned along the jet. The jet is at least 1400 yr old; the knots are being ejected at the rate of one pair roughly every 35-45 yr (independent of the tilt angle and distance to He 2-90), and accretion is still occurring since the youngest jet material is only ~10 yr old. The jet can be plausibly driven by an accretion disk around a low-mass companion in an eccentric orbit with a period of ~40 yr, with increased accretion during periastron passage producing the jet knots.

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