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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709812.0, MPI für Astronomie / Publikationen_mpia
The physical parameters of the retired a star HD 185351
Authors:Johnson, J. A.; Huber, D.; Boyajian, T.; Brewer, J. M.; White, T. R.; von Braun, K.; Maestro, V.; Stello, D.; Barclay, T.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Issue / Number:1
Start Page:id. 15 (13 pp)
Audience:Not Specified
Abstract / Description:We report here an analysis of the physical stellar parameters of the giant star HD 185351 using Kepler short-cadence photometry, optical and near infrared interferometry from CHARA, and high-resolution spectroscopy. Asteroseismic oscillations detected in the Kepler short-cadence photometry combined with an effective temperature calculated from the interferometric angular diameter and bolometric flux yield a mean density rhosstarf = 0.0130 ± 0.0003 rho&sun; and surface gravity log g = 3.280 ± 0.011. Combining the gravity and density we find R sstarf = 5.35 ± 0.20 R &sun; and M sstarf = 1.99 ± 0.23 M &sun;. The trigonometric parallax and CHARA angular diameter give a radius R sstarf = 4.97 ± 0.07 R &sun;. This smaller radius, when combined with the mean stellar density, corresponds to a stellar mass 1.60 ± 0.08 M &sun;, which is smaller than the asteroseismic mass by 1.6sigma. We find that a larger mass is supported by the observation of mixed modes in our high-precision photometry, the spacing of which is consistent only for M sstarf >~ 1.8 M &sun;. Our various and independent mass measurements can be compared to the mass measured from interpolating the spectroscopic parameters onto stellar evolution models, which yields a model-based mass M sstarf, model = 1.87 ± 0.07 M &sun;. This mass agrees well with the asteroseismic value, but is 2.6sigma higher than the mass from the combination of asteroseismology and interferometry. The discrepancy motivates future studies with a larger sample of giant stars. However, all of our mass measurements are consistent with HD 185351 having a mass in excess of 1.5 M &sun;.
Free Keywords:stars: abundances; stars: individual: HD 185351; stars: interiors; stars: oscillations
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/794/1/15
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