Measuring stellar differential rotation with asteroseismology

Laurent Gizon, Sami K. Solanki

    Research output: Contribution to journalArticle

    Abstract

    The variation of rotation with latitude is poorly known on stars other than the Sun. Several indirect techniques, photometric and spectroscopic, have been used to search for departure from rigid rotation for sufficiently fast rotators. Here we investigate the possibility of measuring stellar differential rotation for solar-type stars through asteroseismology. Rotationally split frequencies of global oscillation provide information about rotation at different latitudes depending on the azimuthal order, m, of the mode of pulsation. We present a method to estimate differential rotation based on the realization that the m = ±1 and m = ±2 components of quadrupole oscillations can be observed simultaneously in asteroseismology. Rotational frequency splittings can be inverted to provide an estimate of the difference in stellar angular velocity between the equator and 45° latitude. The precision of the method, assessed through Monte Carlo simulations, depends on the value of the mean rotation and on the inclination angle between the rotation axis and the line of sight.

    Original languageEnglish (US)
    Pages (from-to)169-184
    Number of pages16
    JournalSolar Physics
    Volume220
    Issue number2
    DOIs
    StatePublished - Apr 1 2004

    Fingerprint

    asteroseismology
    oscillation
    stars
    oscillations
    equators
    estimates
    angular velocity
    measuring
    line of sight
    inclination
    quadrupoles

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Measuring stellar differential rotation with asteroseismology. / Gizon, Laurent; Solanki, Sami K.

    In: Solar Physics, Vol. 220, No. 2, 01.04.2004, p. 169-184.

    Research output: Contribution to journalArticle

    Gizon, Laurent ; Solanki, Sami K. / Measuring stellar differential rotation with asteroseismology. In: Solar Physics. 2004 ; Vol. 220, No. 2. pp. 169-184.
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