Properties of the Hyades, the eclipsing binary HD27130, and the oscillating red giant ε Tauri

被引：8

作者：

Brogaard, K. ^{[1
,2
]}

Pakstiene, E. ^{[2
]}

Grundahl, F. ^{[1
,2
]}

Mikolaitis, S. ^{[2
]}

Tautvaisiene, G. ^{[2
]}

Slumstrup, D. ^{[1
,3
]}

Talens, G. J. J. ^{[4
]}

VandenBerg, D. A. ^{[5
]}

Miglio, A. ^{[6
]}

Arentoft, T. ^{[1
]}

Kjeldsen, H. ^{[1
,2
]}

Janulis, R. ^{[2
]}

Drazdauskas, A. ^{[2
]}

Marchini, A. ^{[7
]}

Minkeviciute, R. ^{[2
]}

Stonkute, E. ^{[2
]}

Bagdonas, V ^{[2
]}

Andersen, M. Fredslund ^{[1
]}

Jessen-Hansen, J. ^{[1
]}

Palle, P. L. ^{[8
,9
]}

Dorval, P. ^{[10
,11
]}

Snellen, I. A. G. ^{[10
]}

Otten, G. P. P. L. ^{[12
]}

White, T. R. ^{[1
,13
]}

机构：

[1] Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[2] Vilnius Univ, Astron Observ, Inst Theoret Phys & Astron, Sauletekio Av 3, LT-10257 Vilnius, Lithuania

[3] European Southern Observ, Alonso de Cordova 3107, Santiago, Chile

[4] Univ Montreal, Dept Phys, Inst Rech Exoplanetes, Montreal, PQ H3C 3J7, Canada

[5] Univ Victoria, Dept Phys & Astron, Victoria, BC V8W 2Y2, Canada

[6] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[7] Univ Siena, Astron Observ, Dept Phys Sci Earth & Environm, Via Roma 56, I-53100 Siena, Italy

[8] Inst Astrofis Canarias, Tenerife 38200, Spain

[9] Univ La Laguna ULL, Dept Astrofis, Tenerife 38206, Spain

[10] Leiden Univ, Leiden Observ, Postbus 9513, NL-2300 RA Leiden, Netherlands

[11] ASTRON, NOVA Opt IR Instrumentat Grp, POB 2, NL-7990 AA Dwingeloo, Netherlands

[12] Aix Marseille Univ, LAM, CNES, CNRS, Marseille, France

[13] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 645卷

基金：

新加坡国家研究基金会;

关键词：

binaries: eclipsing; open clusters and associations: individual: Hyades; stars: oscillations; stars: abundances; stars: individual: HD27130; stars: individual: E Tau; ASTEROSEISMIC MASS; RADIAL-VELOCITY; OPEN CLUSTERS; NGC; 6791; DISTANCE; SOLAR; STARS; MODELS; EVOLUTION; SPECTRA;

D O I：

10.1051/0004-6361/202039250

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. The derivation of accurate and precise masses and radii is possible for eclipsing binary stars, allowing for insights into their evolution. When residing in star clusters, they provide measurements of even greater precision, along with additional information on their properties. Asteroseismic investigations of solar-like oscillations offers similar possibilities for single stars.Aims. We wish to improve the previously established properties of the Hyades eclipsing binary HD 27130 and re-assess the asteroseismic properties of the giant star E Tau. The physical properties of these members of the Hyades can be used to constrain the helium content and age of the cluster.Methods. New multi-colour light curves were combined with multi-epoch radial velocities to yield masses and radii of HD 27130. Measurements of T-eff were derived from spectroscopy and photometry, and verified using the Gaia parallax. We estimated the cluster age from re-evaluated asteroseismic properties of E Tau while using HD 27130 to constrain the helium content.Results. The masses, radii, and T-eff of HD 27130 were found to be M=1.0245 0.0024 M-circle dot, R=0.9226 +/- 0.015 R-circle dot, T-eff=5650 +/- 50 K for the primary, and M=0.7426 +/- 0.0016 M-circle dot, R=0.7388 +/- 0.026 R-circle dot, T-eff=4300 +/- 100 K for the secondary component. Our re-evaluation of E Tau suggests that the previous literature estimates are trustworthy and that the HIPPARCOS parallax is more reliable than the Gaia DR2 parallax.Conclusions. The helium content of HD 27130 and, thus, of the Hyades is found to be Y=0.27 but with a significant model dependency. Correlations with the adopted metallicity result in a robust helium enrichment law, with Delta Y/Delta Z close to 1.2 We estimate the age of the Hyades to be 0.9 +/- 0.1 (stat) +/- 0.1 (sys) Gyr, which is in slight tension with recent age estimates based on the cluster white dwarfs. The precision of the age estimate can be much improved via asteroseismic investigations of the other Hyades giants and by future improvements to the Gaia parallax for bright stars.

引用

页数：14

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