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An abundance analysis of AK Sco, a Herbig Ae SB2 system with a magnetic component

Published online by Cambridge University Press:  03 March 2020

Swetlana Hubrig ,
Fiorella Castelli  and
Silva P. Järvinen
Swetlana Hubrig
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482Potsdam, Germany email: [email protected], [email protected]
Fiorella Castelli
Affiliation:
Instituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143, Trieste, Italy email: [email protected]
Silva P. Järvinen
Affiliation:
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482Potsdam, Germany email: [email protected], [email protected]
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Abstract

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AK Sco is an SB2 system formed by two nearly identical Herbig Ae stars, with Teff = 6500K and log g = 4.5, surrounded by a circumbinary disk. This actively accreting system is of special interest among the pre-main-sequence binaries because of its prominent ultraviolet excess and the high eccentricity of its orbit. Moreover, recent spectropolarimetric observations using HARPSpol indicate the presence of a weak magnetic field in the secondary component (Järvinen et al. 2018). An abundance analysis of both components has shown that all elements have a solar abundance in the two stars, except for Li and Ba. These elements are enhanced by 2.2 and 0.5 dex, respectively, in the A component and by 2.4 and 0.5 dex, respectively, in the B component.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 133
Copyright
© International Astronomical Union 2020

References

Järvinen, S.P., et al., 2018, ApJ, 858, L18 CrossRefGoogle Scholar