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Binary-Induced Pinwheel Outflow In The Extreme Carbon Star AFGL 3068.pdf

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Preview of Binary-Induced Pinwheel Outflow in the Extreme Carbon Star AFGL 3068
🔗 Source: spacetelescope.org
📊 Size: 141 KB
👤 Author: Mark Morris, Raghvendra Sahai, Keith Matthews, Judy Cheng, Jessica Lu, Mark Claussen and Carmen S&aa
⬇️ Downloads: 43

Summary

Key findings include:

- Mass Loss and Obscurity: AFGL 3068 is losing mass at a rate of 10^-4 M⊙ yr^-1 and is obscured by a thick dust photosphere with a color temperature of ~300K, visible only in the infrared.

- Spiral Arc Observation: Using the ACS camera on the Hubble Space Telescope (HST), researchers imaged AFGL 3068 revealing a thin, continuous spiral arc winding around the star 4-5 times, indicating nested spiral shells.

- Binary System Confirmation: Near-IR observations with the NIRC2 camera on Keck II telescope using adaptive optics confirmed AFGL 3068 is part of a binary system with a companion star separated by 0.11 arcsec (109 AU) at a distance of 1 kpc.

- Binary Period and Shell Formation: The binary period is estimated to be 710 years, matching the separation between the observed shells (spaced every few hundred years). This suggests that the spiral shells are formed by material ejected from the mass-losing carbon star due to a binary companion in an eccentric orbit.

- Implications: The study proposes that binary companions might be responsible for the quasi-concentric shells observed in many pre-planetary nebulae, with illumination likely coming from galactic starlight.

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Description

This publication explores the binary-induced pinwheel outflow of the extreme carbon star AFGL 3068, as detailed in the IAU Symposium No. 234 (2006), highlighting astronomical observations and theories beyond our Galaxy.

Technical Information

  • File Format: PDF
  • File Size: 141 KB
  • Pages: 2
  • Language: EN
  • Author: Mark Morris, Raghvendra Sahai, Keith Matthews, Judy Cheng, Jessica Lu, Mark Claussen and Carmen S&aa
  • Total Downloads: 43
  • Last Updated: 1 month ago

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