CHANDRA CHARACTERIZATION OF X-RAY EMISSION IN THE YOUNG F-STAR BINARY SYSTEM HD 113766
Author(s)Lisse, C. M.; Christian, D. J.; Wolk, S. J.; Chen, C. H.; Grady, C. A.; Guenther, Hans Moritz; ... Show more Show less
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Using Chandra, we have obtained imaging X-ray spectroscopy of the 10–16 Myr old F-star binary HD 113766. We individually resolve the 1[fraction of arcsecond]4 separation binary components for the first time in the X-ray and find a total 0.3–2.0 keV luminosity of 2.2 × 10[superscript 29] erg s[superscript −1], consistent with previous RASS estimates. We find emission from the easternmost, infrared-bright, dusty member HD 113766A to be only ~10% that of the western, infrared-faint member HD 113766B. There is no evidence for a 3rd late-type stellar or substellar member of HD 113766 with L[subscript x ]> 6 × 1025 erg s[superscript −1] within 2' of the binary pair. The ratio of the two stars' X-ray luminosity is consistent with their assignments as F2V and F6V by Pecaut et al. The emission is soft for both stars, kT[superscript Apec] = 0.30–0.50 keV, suggesting X-rays produced by stellar rotation and/or convection in young dynamos, but not accretion or outflow shocks, which we rule out. A possible 2.8 ± 0.15 (2σ) hr modulation in the HD 113766B X-ray emission is seen, but at very low confidence and of unknown provenance. Stellar wind drag models corresponding to L[superscript x] ~ 2 × 1029 erg s[superscript −1] argue for a 1 mm dust particle lifetime around HD 113766B of only ~90,0000 years, suggesting that dust around HD 113766B is quickly removed, whereas 1 mm sized dust around HD 113766A can survive for >1.5 × 106 years. At 1028–1029 erg s[superscript −1] X-ray luminosity, astrobiologically important effects, like dust warming and X-ray photolytic organic synthesis, are likely for any circumstellar material in the HD 113766 systems.
DepartmentMIT Kavli Institute for Astrophysics and Space Research
The Astronomical Journal
Lisse, C. M. et al. “CHANDRA CHARACTERIZATION OF X-RAY EMISSION IN THE YOUNG F-STAR BINARY SYSTEM HD 113766.” The Astronomical Journal 153.2 (2017): 62. © 2017 The American Astronomical Society
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