2014A&A...570A..95W


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET00:55:38

2014A&A...570A..95W - Astronomy and Astrophysics, volume 570A, 95-95 (2014/10-1)

Masses and activity of AB Doradus B a/b. The age of the AB Dor quadruple system revisited.

WOLTER U., CZESLA S., FUHRMEISTER B., ROBRADE J., ENGELS D., WIERINGA M. and SCHMITT J.H.M.M.

Abstract (from CDS):

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 ≥30km/s for 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±50K for the primary and approximately 60K 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 simultaneous XMM-Newton observations, 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 100Myr.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: coronae - stars: low-mass - stars: rotation - binaries: general - stars: individual: Rst 137B

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 G 272-61B Fl* 01 39 01.6334059022 -17 57 01.121866655     13.2     M6V 780 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2912 0
3 HD 36705B ** 05 28 44.4833327579 -65 26 46.034324029     13.0     M5+M5-6 84 0
4 ** RST 137 ** 05 28 44.78 -65 26 56.2           ~ 8 1
5 HD 36705C * 05 28 44.83 -65 26 54.9           M8: 57 1
6 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 910 0
7 V* YZ CMi BY* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 769 0
8 IC 2391 OpC 08 40 32 -53 02.0           ~ 703 0
9 BD+20 2465 ** 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1115 0
10 Wolf 359 Fl* 10 56 28.826208 +07 00 52.34400 16.706 15.541 13.507 11.684 9.507 M6Ve 623 0
11 V* V645 Cen Fl* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 889 0
12 NAME AB Dor Moving Group MGr ~ ~           ~ 333 0

    Equat.    Gal    SGal    Ecl

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2019.11.14-00:55:38

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