The dense and asymmetric central star wind of the young PN He 2-138

Details The dense and asymmetric central star wind of the young PN He 2-138 The dense and asymmetric central star wind of the young PN He 2-138

2009-10-26

arxiv.org/abs/0910.4643v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 9 figures, MNRAS in press

Scientific paper

We present optical ESO time-series and UV archival (FUSE, HST, IUE) spectroscopy of the H-rich central star of He 2-138. Our study targets the central star wind in a very young planetary nebula, and explores physical conditions that may provide clues to the nature of the preceding post-AGB super-wind phases of the star. We provide evidence for a dense, slowly accelerating outflow that is variable on time-scales of hours. Line-synthesis modelling (SEI and CMFGEN) of low and high ionization UV and optical lines is interpreted in terms of an asymmetric, two-component outflow, where high-speed high-ionization gas forms mostly in the polar region. Slower, low ionization material is then confined primarily to a cooler equatorial component of the outflow. A dichotomy is also evident at photospheric levels. We also document temporal changes in the weak photospheric lines of He 2-138, with tentative evidence for a 0.36-day modulation in blue-to-red migrating features in the absorption lines. These structures may betray 'wave-leakage' of prograde non-radial pulsations of the central star. These multi-waveband results on the aspherical outflow of He 2-138 are discussed in the context of current interest in understanding the origin of axi- and point-symmetric planetary nebulae.

Affiliated with

Also associated with

No associations

Rating

The dense and asymmetric central star wind of the young PN He 2-138 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 dense and asymmetric central star wind of the young PN He 2-138, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The dense and asymmetric central star wind of the young PN He 2-138 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-561898