Masses and activity of AB Doradus B a/b - The age of the AB Dor quadruple system revisited
Masses and activity of AB Doradus B a/b - The age of the AB Dor quadruple system revisited
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AB Doradus B a/b 的质量和活动 - 重新审视 AB Dor 四重系统的年龄
DOI:
10.1051/0004-6361/201424137
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发表时间:
2014
影响因子:
6.5
通讯作者:
Fuhrmeister
中科院分区:
文献类型:
--
作者:
Wolter;Czesla;Fuhrmeister
We present a multiwavelength study of the close binary AB Dor Ba/b (Rst137B). Our study comprises astrometric orbit measurements, optical spectroscopy, X-ray and radio observations. Using all available adaptive optics images of AB Dor B taken with VLT/NACO from 2004 to 2009, we tightly constrain its orbital period to 360.6 ± 1.5 days. We present the first orbital solution of Rst 137B and estimate the combined mass of AB Dor Ba+b as 0.69+0.02-0.24M⊙, slightly exceeding previous estimates based on IR photometry. Our determined orbital inclination of Rst 137B is close to the axial inclination of AB Dor A inferred from Doppler imaging. Our VLT/UVES spectra yield high rotational velocities of ≥30 km s-1for both components Ba and Bb, in accord with previous measurements, which corresponds to rotation periods significantly shorter than one day. Our combined spectral model, using PHOENIX spectra, yields an effective temperature of 3310 ± 50 K for the primary and approximately 60 K less for the secondary. The optical spectra presumably cover a chromospheric flare and show that at least one component of Rst 137B is significantly active. Activity and weak variations are also found in our simultaneousXMM-Newtonobservations, while our ATCA radio data yield constant fluxes at the level of previous measurements. Using evolutionary models, our newly determined stellar parameters confirm that the age of Rst 137B is between 50 and 100 Myr.
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