2011A&A...534L...3B


Query : 2011A&A...534L...3B

2011A&A...534L...3B - Astronomy and Astrophysics, volume 534, L3-3 (2011/10-1)

The diameter of the CoRoT target HD 49933. Combining the 3D limb darkening, asteroseismology, and interferometry.

BIGOT L., MOURARD D., BERIO P., THEVENIN F., LIGI R., TALLON-BOSC I., CHESNEAU O., DELAA O., NARDETTO N., PERRAUT K., STEE P., BOYAJIAN T., MOREL P., PICHON B., KERVELLA P., SCHMIDER F.X., McALISTER H., TEN BRUMMELAAR T., RIDGWAY S.T., STURMANN J., STURMANN L., TURNER N., FARRINGTON C. and GOLDFINGER P.J.

Abstract (from CDS):

The interpretation of stellar pulsations in terms of internal structure depends on the knowledge of the fundamental stellar parameters. Long-base interferometers permit us to determine very accurate stellar radii, which are independent constraints for stellar models that help us to locate the star in the HR diagram. Using a direct interferometric determination of the angular diameter and advanced three-dimensional (3D) modeling, we derive the radius of the CoRoT target HD49933 and reduce the global stellar parameter space compatible with seismic data. The VEGA/CHARA spectro-interferometer is used to measure the angular diameter of the star. A 3D radiative hydrodynamical simulation of the surface is performed to compute the limb darkening and derive a reliable diameter from visibility curves. The other fundamental stellar parameters (mass, age, and Teff) are found by fitting the large and small p-mode frequency separations using a stellar evolution model that includes microscopic diffusion. We obtain a limb-darkened angular diameter of θLD=0.445±0.012mas. With the Hipparcos parallax, we obtain a radius of R=1.42±0.04R. The corresponding stellar evolution model that fits both large and small frequency separations has a mass of 1.20±0.08M and an age of 2.7Gy. The atmospheric parameters are Teff=6640±100K, logg=4.21±0.14, and [Fe/H]=-0.38.

Abstract Copyright:

Journal keyword(s): stars: oscillations - hydrodynamics - stars: fundamental parameters - techniques: interferometric - asteroseismology - stars: individual: HD49933

Simbad objects: 7

goto Full paper

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 46487 * 06 33 37.9213970040 -01 13 12.553237092   4.934 5.079     B5IV/V 77 0
2 HD 49933 PM* 06 50 49.8309774552 -00 32 27.167495244   6.147 5.771 7.04   F3V 361 2
3 * del Mon * 07 11 51.8607792 -00 29 33.970825   4.14 4.15     A0IV 91 0
4 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1829 0
5 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 904 0
6 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 976 1
7 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1220 0

To bookmark this query, right click on this link: simbad:objects in 2011A&A...534L...3B and select 'bookmark this link' or equivalent in the popup menu


2022.12.06-13:16:55

© Université de Strasbourg/CNRS

    • Contact