Doppler images of the eclipsing binary ER Vulpeculae

Yue Xiang, Shenghong Gu, A. Collier Cameron, J.R. Barnes

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    Abstract

    We present Doppler images of both components of the eclipsing binary system ER Vul, based on the spectra obtained in 2004 November, 2006 September and 2008 November. The least-squares deconvolution technique is used for enhancing the signal-to-noise ratios of the observed profiles. The new surface images reveal that both stars of ER Vul show strong starspot activities and the starspots appear at various latitudes. The surface maps of 2006 and 2008 both show the presence of large high-latitude starspots on each component of ER Vul. We find no obvious phase shift of the active regions during our observations. The longitude distributions of starspots are non-uniform on both stars. At low-to-mid latitudes, the active regions are almost exclusively found in the hemisphere facing the other star. However, we find no pronounced concentration of spots at the sub-stellar points.

    Original languageEnglish
    Pages (from-to)567-576
    Number of pages10
    JournalMonthly Notices of the Royal Astronomical Society
    Volume447
    Issue number1
    Early online date18 Dec 2014
    DOIs
    Publication statusPublished - 11 Feb 2015

    Keywords

    • Binaries: eclipsing
    • Stars: activity
    • Stars: imaging
    • Stars: individual: ER vulpeculae
    • Starspots

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