The ``Water-Fountain Nebula'' IRAS 16342-3814: Hubble Space Telescope/Very Large Array Study of a Bipolar Protoplanetary Nebula

Details The ``Water-Fountain Nebula'' IRAS 16342-3814: Hubble Space Telescope/Very Large Array Study of a Bipolar Protoplanetary Nebula The ``Water-Fountain Nebula'' IRAS 16342-3814: Hubble Space Telescope/Very Large Array Study of a Bipolar Protoplanetary Nebula

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...514l.115s&link_type=abstract

The Astrophysical Journal, Volume 514, Issue 2, pp. L115-L119.

Astronomy and Astrophysics

Astronomy

55

Stars: Circumstellar Matter, Ism: Planetary Nebulae: General, Stars: Agb And Post-Agb, Stars: Mass Loss

Scientific paper

We present Hubble Space Telescope (HST) Wide-Field and Planetary Camera 2 images and VLA OH maser emission-line maps of the cold infrared object IRAS 16342-3814, believed to be a protoplanetary nebula. The HST images show an asymmetrical bipolar nebula, with the lobes separated by a dark equatorial waist. The two bright lobes and the dark waist are simply interpreted as bubble-like reflection nebulae illuminated by starlight escaping through polar holes in a dense, flattened, optically thick cocoon of dust, which completely obscures the central star. A faint halo can be seen surrounding each of the lobes. The bubbles are likely to have been created by a fast outflow (evidenced by H_2O emission) plowing into a surrounding dense, more slowly expanding, circumstellar envelope of the progenitor asymptotic giant-branch (AGB) star (evidenced by the halo). The IRAS fluxes indicate a circumstellar mass of about 0.7 M_solar(D/2 kpc) and an AGB mass-loss rate of about 10^-4 M_solar yr^-1 (V_exp/15 km s^-1)(D/2 kpc)^2 (assuming a gas-to-dust ratio of 200). OH features with the largest redshifted and blueshifted velocities are concentrated around the bright eastern and western polar lobes, respectively, whereas intermediate-velocity features generally occur at low latitudes, in the dark waist region. We critically examine evidence for the post-AGB classification of IRAS 16342-3814.

Affiliated with

Also associated with

No associations

Rating

The ``Water-Fountain Nebula'' IRAS 16342-3814: Hubble Space Telescope/Very Large Array Study of a Bipolar Protoplanetary Nebula 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 The ``Water-Fountain Nebula'' IRAS 16342-3814: Hubble Space Telescope/Very Large Array Study of a Bipolar Protoplanetary Nebula, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The ``Water-Fountain Nebula'' IRAS 16342-3814: Hubble Space Telescope/Very Large Array Study of a Bipolar Protoplanetary Nebula will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1429715