Linear Line Polarimetry Modelling of Pre-main Sequence Stars

J.S. Vink, J.E. Drew, T.J. Harries, R.D. Oudmaijer

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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    Abstract

    We present emission line polarimetry data and modelling relevant to the circumstellar geometry and kinematics around pre-main sequence stars. For a sample of both Herbig Ae/Be stars and T Tauri stars, we find that most show polarization changes across H®, implying that flattened structures are common on the smallest scales { and over a range of stellar masses. We also present Monte Carlo calculations of spectral line profiles scattered in rotating accretion disks. We consider the case of a central star that emits line photons uniformly, as well as via hot spots. Intriguingly, the switch between a uniform point source and a finite-sized star results in a marked difference in the position angle variation across the line. Our models demonstrate the diagnostic potential of line polarimetry in determining the disk inclination and the size of the inner hole { a spatial scale no other technique currently accesses.
    Original languageEnglish
    Title of host publicationIn: Astronomical Polarimetry: Current Status and Future Directions - ASP Conf Series Vol.343
    PublisherAstronomical Society of the Pacific
    Pages232-7
    ISBN (Print)978-1-58381-277-8, 1-58381-210-5
    Publication statusPublished - 2005

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