2009A&A...503..521M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST16:53:23

2009A&A...503..521M - Astronomy and Astrophysics, volume 503, 521-531 (2009/8-4)

Asteroseismology and interferometry of the red giant star ε Ophiuchi.

MAZUMDAR A., MERAND A., DEMARQUE P., KERVELLA P., BARBAN C., BAUDIN F., COUDE DU FORESTO V., FARRINGTON C., GOLDFINGER P.J., GOUPIL M.-J., JOSSELIN E., KUSCHNIG R., McALISTER H.A., MATTHEWS J., RIDGWAY S.T., STURMANN J., STURMANN L., TEN BRUMMELAAR T.A. and TURNER N.

Abstract (from CDS):

The GIII red giant star ε Oph has been found to exhibit several modes of oscillation by the MOST mission. We interpret the observed frequencies of oscillation in terms of theoretical radial p-mode frequencies of stellar models. Evolutionary models of this star, in both shell H-burning and core He-burning phases of evolution, are constructed using as constraints a combination of measurements from classical ground-based observations (for luminosity, temperature, and chemical composition) and seismic observations from MOST. Radial frequencies of models in either evolutionary phase can reproduce the observed frequency spectrum of ε Oph almost equally well. The best-fit models indicate a mass in the range of 1.85±0.05M with radius of 10.55±0.15R. We also obtain an independent estimate of the radius of ε Oph with highly accurate interferometric observations in the infrared K' band, using the CHARA/FLUOR instrument. The measured limb-darkened disk angular diameter of ε Oph is 2.961±0.007mas. Together with the Hipparcos parallax, this translates into a photospheric radius of R=10.39±0.07R. The radius obtained from the asteroseismic analysis matches the interferometric value quite closely even though the radius was not constrained during the modelling.

Abstract Copyright:

Journal keyword(s): stars: individual: ε Ophiuchi - stars: oscillations - stars: interiors - stars: fundamental parameters - techniques: interferometric

Simbad objects: 6

goto Full paper

goto View the reference in ADS

Number of rows : 6

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 * alf UMa SB* 11 03 43.67152 +61 45 03.7249 3.78 2.86 1.79 0.98 0.40 G9III+A7.5 424 0
2 * ksi Hya ** 11 33 00.1150559 -31 51 27.443449 5.17 4.47 3.54 2.84 2.36 G7IIIb 233 0
3 HD 145085 * 16 08 58.8796273330 +03 27 16.111026557   7.406 5.909     K4III 19 0
4 * eps Oph PM* 16 18 19.2897431 -04 41 33.034466 4.95 4.21 3.23 2.54 2.05 G9.5IIIbFe-0.5 226 0
5 HD 162468 * 17 50 43.6043098798 +11 56 47.583933282   7.441 6.193     K1III-IV 23 0
6 HD 166460 * 18 10 40.2995935771 +03 19 27.329496976   6.693 5.489     K1II 58 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009A&A...503..521M and select 'bookmark this link' or equivalent in the popup menu


2020.10.24-16:53:23

© Université de Strasbourg/CNRS

    • Contact