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Hubble Space Telescope imaging and spectroscopy of the sirius-like triple star system HD 217411

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journal contribution
posted on 14.04.2016, 11:33 by J. B. Holberg, Sarah L. Casewell, H. E. Bond, M. R. Burleigh, M. A. Barstow
We present Hubble Space Telescope imaging and spectroscopy of HD 217411, a G3 V star associated with the extreme ultraviolet (UV) excess source (EUV 2RE J2300­­–07.0). This star is revealed to be a triple system with a G 3V primary (HD 217411 A) separated by ∼1.1 arcsec from a secondary that is in turn composed of an unresolved K0 V star (HD 217411 Ba) and a hot DA white dwarf (HD 217411 Bb). The hot white dwarf dominates the UV flux of the system. However, it is in turn dominated by the K0 V component beyond 3000 Å. A revised distance of 143 pc is estimated for the system. A low level photometric modulation having a period of 0.61 d has also been observed in this system along with a rotational velocity of the order of 60 km s−1 in the K0 V star. Together both observations point to a possible wind induced spin-up of the K0 V star during the AGB phase of the white dwarf. The nature of all three components is discussed as are constraints on the orbits, system age and evolution.

History

Citation

Monthly Notices Of The Royal Astronomical Society, 2014, 444 (3), pp. 2022-2030 (9)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices Of The Royal Astronomical Society

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Acceptance date

14/07/2014

Copyright date

2014

Available date

14/04/2016

Publisher version

http://mnras.oxfordjournals.org/content/444/3/2022

Language

en