Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members: III. Constraints from a subgiant

被引：17

作者：

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

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

Sandquist, E. L. ^{[3
]}

Slumstrup, D. ^{[1
,4
]}

Jensen, M. L. ^{[5
]}

Thomsen, J. B. ^{[5
]}

Jorgensen, J. H. ^{[5
]}

Larsen, J. R. ^{[5
]}

Bjorn, S. T. ^{[5
]}

Sorensen, C. T. G. ^{[5
]}

Bruntt, H. ^{[1
]}

Arentoft, T. ^{[1
]}

Frandsen, S. ^{[1
]}

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

Orosz, J. A. ^{[3
]}

Mathieu, R. ^{[6
]}

Geller, A. ^{[7
,8
,9
]}

Ryde, N. ^{[10
]}

Stello, D. ^{[1
,11
,12
]}

Meibom, S. ^{[13
]}

Platais, I. ^{[14
]}

机构：

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

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

[3] San Diego State Univ, Dept Astron, San Diego, CA 92182 USA

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

[5] Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[6] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[7] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, 1800 Sherman Ave, Evanston, IL 60201 USA

[8] Northwestern Univ, Dept Phys & Astron, 1800 Sherman Ave, Evanston, IL 60201 USA

[9] Adler Planetarium, Dept Astron, 1300 South Lake Shore Dr, Chicago, IL 60605 USA

[10] Lund Univ, Lund Observ, Dept Astron & Theoret Phys, Box 43, S-22100 Lund, Sweden

[11] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

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

[13] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[14] Johns Hopkins Univ, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2021年 / 649卷 / 649期

基金：

新加坡国家研究基金会;

关键词：

binaries: spectroscopic; stars: fundamental parameters; stars: individual: V604 Lyr; stars: abundances; open clusters and associations: individual: NGC6791; RED GIANTS; KEPLER; SOLAR; DISTANCE; PHOTOMETRY; SPECTRA; PLANETS; SYSTEMS; SEARCH; STARS;

D O I：

10.1051/0004-6361/202140911

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Models of stellar structure and evolution can be constrained using accurate measurements of the parameters of eclipsing binary members of open clusters. Multiple binary stars provide the means to tighten the constraints and, in turn, to improve the precision and accuracy of the age estimate of the host cluster. In the previous two papers of this series, we have demonstrated the use of measurements of multiple eclipsing binaries in the old open cluster NGC 6791 to set tighter constraints on the properties of stellar models than was previously possible, thereby improving both the accuracy and precision of the cluster age.Aims. We identify and measure the properties of a non-eclipsing cluster member, V56, in NGC 6791 and demonstrate how this provides additional model constraints that support and strengthen our previous findings.Methods. We analyse multi-epoch spectra of V56 from FLAMES in conjunction with the existing photometry and measurements of eclipsing binaries in NGC6971.Results. The parameters of the V56 components are found to be M-p=1.1030.008 M-circle dot and M-s=0.974 +/- 0.007 M-circle dot, R-p=1.764 +/- 0.099 R-circle dot and R-s=1.045 +/- 0.057 R-circle dot, T-eff,T-p=5447 +/- 125 K and T-eff,T-s=5552 +/- 125 K, and surface [Fe/H] = +0.29 +/- 0.06 assuming that they have the same abundance.Conclusions. The derived properties strengthen our previous best estimate of the cluster age of 8.3 +/- 0.3 Gyr and the mass of stars on the lower red giant branch (RGB), which is M-RGB=1.15 +/- 0.02 M-circle dot for NGC 6791. These numbers therefore continue to serve as verification points for other methods of age and mass measures, such as asteroseismology.

引用

页数：8

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