Variable sub-arcsecond structure in the circumstellar envelope of IRC+10216

Details Variable sub-arcsecond structure in the circumstellar envelope of IRC+10216 Variable sub-arcsecond structure in the circumstellar envelope of IRC+10216

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...334l...5h&link_type=abstract

Astronomy and Astrophysics, v.334, p.L5-L8 (1998)

Astronomy and Astrophysics

Astrophysics

43

Stars, Agb, Individual: Irc+10216, Mass-Loss

Scientific paper

We present new diffraction-limited interferometric images of the carbon star IRC+10216 at wavelengths of 2.2 mu m and 3.4 mu m. These show that the distribution of the near-infrared emission from the star departs significantly from a spherical geometry on 0.1 arcsecond scales. At 3.4 mu m, i.e. close to the peak of the star/dust-shell spectral energy distribution, approximately 60% of the flux comes from regions asymmetrically disposed about the stellar photosphere at radii of 0.1-0.3 arcseconds. Images taken in 1989 and 1997 show large changes in the distribution of flux, but a consistent axis of symmetry at a PA of approximately -5deg . Archival Hubble Space Telescope images at 0.79 and 1.06 mu m show filaments with the same symmetry axis and a dark lane perpendicular to this axis approximately 0.25 arcseconds to the north of the star. Taken together, these data suggest a model in which the asymmetries seen are a consequence of envelope clearing along a bipolar axis. These observations indicate that the asymmetries seen in planetary nebulae may already be established before the progenitor star has left the AGB. Based, in part, on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under the NASA contract NAS 5-26555.

Affiliated with

Also associated with

No associations

Rating

Variable sub-arcsecond structure in the circumstellar envelope of IRC+10216 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 Variable sub-arcsecond structure in the circumstellar envelope of IRC+10216, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable sub-arcsecond structure in the circumstellar envelope of IRC+10216 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1330182