SIMBAD references

2020MNRAS.496..718J - Mon. Not. R. Astron. Soc., 496, 718-722 (2020/July-3)

TESS photometry of helium-rich hot subdwarfs: r modes in BD+37°442 and BD+37°1977.


Abstract (from CDS):

Transiting Exoplanet Survey Satellite photometry of the extremely helium-rich hot subdwarfs BD+37°442 and BD+37°1977 demonstrates multiperiodic low-amplitude variability with principal periods of 0.56 and 1.14 d, respectively, and with both first and second harmonics present. The light curves are not perfectly regular, implying additional periodic and/or non-periodic content. Possible causes are examined, including the binary hypothesis originally introduced to explain X-ray observations, differentially rotating surface inhomogeneities, and pulsations. If the principal photometric periods correspond to the rotation periods, the stars are rotating at approximately 0.7 and 0.3 x break-up, respectively. Surface Rossby waves (r modes) therefore provide the most likely solution.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: chemically peculiar - stars: early-type - stars: individual: BD+37deg442 - stars: individual: BD+37deg1977 - stars: pulsation - stars: subdwarfs

Simbad objects: 8

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