The size of ABDorA from VLTI/AMBER interferometry

Details The size of ABDorA from VLTI/AMBER interferometry The size of ABDorA from VLTI/AMBER interferometry

2011-08-05

arxiv.org/abs/1108.1375v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 5 figures. Accepted for publication in A&A

Scientific paper

The pre-main sequence (PMS) star ABDorA is the main component of the quadruple system ABDoradus. The precise determination of the mass and photometry of the close companion to ABDorA, ABDorC, has provided an important benchmark for calibration of theoretical evolutionary models of low-mass stars. The limiting factor to the precision of this calibration is the age of the system, as both the mass and luminosity of ABDorA and C are well monitored by other ongoing programs. In this paper we present VLTI/AMBER observations of ABDorA which provide a direct measurement of the size of this star, 0.96+/-0.06 Rsun. The latter estimate, combined with other fundamental parameters also measured for this star, allows a precise test of PMS evolutionary models using both H-R diagrams and mass-radius relationships. We have found that our radius measurement is larger than that predicted by the models, which we interpret as an evidence of the oversizing produced by the strong magnetic activity of ABDorA. Considering, at least partially, this magnetic effect, theoretical isochrones have been used to derive constraints to the age of ABDorA, favouring an age about 40-50 Myr for this system. Older ages are not completely excluded by our data.

Affiliated with

Also associated with

No associations

Rating

The size of ABDorA from VLTI/AMBER interferometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The size of ABDorA from VLTI/AMBER interferometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The size of ABDorA from VLTI/AMBER interferometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-669259