Bipolar, Collimated Outbursts in the Planetary Nebula HB 4

Details Bipolar, Collimated Outbursts in the Planetary Nebula HB 4 Bipolar, Collimated Outbursts in the Planetary Nebula HB 4

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..697l&link_type=abstract

Astrophysical Journal v.485, p.697

Astronomy and Astrophysics

Astronomy

17

Ism: Jets And Outflows, Ism: Planetary Nebulae: Individual Alphanumeric: Hb 4, Ism: Kinematics And Dynamics

Scientific paper

Spatially resolved profiles of the H alpha and [N II] 6548, 6584 Angstroms emission lines obtained with the Manchester Echelle Spectrometer combined with the 2.1 m San Pedro Martir telescope have revealed the remarkable velocity structure in the peculiar planetary nebula Hb 4. The compact, elliptical core shows a moderate splitting in the [N II] 6584 Angstroms line profiles of only 2Vexp = 43 km s-1. However, the detection of high velocities in the nebular line profiles from the elongated, ionized knots protruding symmetrically on both sides of the core give direct evidence of the presence of highly collimated outflows in Hb 4. The line profiles in these symmetric, elongated knots are complex, with radial velocities of +/-150 km s-1 with respect to the systemic radial velocity and detached emission regions at further extreme radial velocities. The long-slit spectra are analyzed with a parameterized description of the emissivity and velocity field of the fast-moving, collimated, ionized flow. The observed profiles are simulated in detail by a model of the emission from a bow shock at the head of the jet followed by a faster high-density component. In Hb 4 we are probably observing the first stages of intermittent outflows that could develop into episodic two-sided jets, as observed in the case of the planetary nebula Fleming 1.

Affiliated with

Also associated with

No associations

Rating

Bipolar, Collimated Outbursts in the Planetary Nebula HB 4 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Bipolar, Collimated Outbursts in the Planetary Nebula HB 4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bipolar, Collimated Outbursts in the Planetary Nebula HB 4 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1878230