Linear line spectropolarimetry of Herbig Ae/Be stars

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• 作者：Jorick S. Vink
• 关键词：Herbig Ae/Be stars ; T聽Tauri stars ; Pre ; main sequence stars ; Polarization ; Star formation
• 刊名：Astrophysics and Space Science
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：357
• 期：2
• 全文大小：1,168 KB
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• 作者单位：Jorick S. Vink (1)
  
  1. Armagh Observatory, College Hill, BT61 9DG, Armagh, Northern Ireland
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  
• 出版者：Springer Netherlands
• ISSN：1572-946X

文摘

Accretion is the prime mode of star formation, but the exact mode has not yet been identified in the Herbig Ae/Be mass range. We provide evidence that the maximum variation in mass-accretion rate is reached on a rotational timescale, which suggests that rotational modulation is the key to understanding mass accretion. We show how spectropolarimetry is uniquely capable of resolving the innermost (within 0.1 AU) regions between the star and the disk, allowing us to map the 3D geometry of the accreting gas, and test theories of angular momentum evolution. We present Monte Carlo line-emission simulations showing how one would observe changes in the polarization properties on rotational timescales, as accretion columns come and go into our line of sight.