SOUNDING OPEN CLUSTERS: ASTEROSEISMIC CONSTRAINTS FROM KEPLER ON THE PROPERTIES OF NGC 6791 AND NGC 6819

被引：126

作者：

Basu, Sarbani ^{[1
]}

Grundahl, Frank ^{[2
]}

Stello, Dennis ^{[3
]}

Kallinger, Thomas ^{[4
,5
]}

Hekker, Saskia ^{[6
]}

Mosser, Benoit ^{[7
]}

Garcia, Rafael A. ^{[8
]}

Mathur, Savita ^{[9
]}

Brogaard, Karsten ^{[2
]}

Bruntt, Hans ^{[2
]}

Chaplin, William J. ^{[6
]}

Gai, Ning ^{[10
]}

Elsworth, Yvonne ^{[6
]}

Esch, Lisa ^{[1
]}

Ballot, Jerome ^{[11
]}

Bedding, Timothy R. ^{[3
]}

Gruberbauer, Michael ^{[12
]}

Huber, Daniel ^{[3
]}

Miglio, Andrea ^{[13
]}

Yildiz, Mutlu ^{[14
]}

Kjeldsen, Hans ^{[2
]}

Christensen-Dalsgaard, Jorgen ^{[2
]}

Gilliland, Ronald L. ^{[15
]}

Fanelli, Michael M. ^{[16
]}

Ibrahim, Khadeejah A. ^{[17
]}

Smith, Jeffrey C. ^{[18
]}

机构：

[1] Yale Univ, Dept Astron, New Haven, CT 06520 USA

[2] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

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

[4] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[5] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

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

[7] Univ Paris 07, Observ Paris, Univ Paris 06, LESIA,CNRS, F-92195 Meudon, France

[8] Univ Paris 07, CEA DSM CNRS, Lab AIM, IRFU SAp,Ctr Saclay, F-91191 Gif Sur Yvette, France

[9] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA

[10] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China

[11] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France

[12] St Marys Univ, Dept Phys & Astron, Inst Computat Astrophys, Halifax, NS B3H 3C3, Canada

[13] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[14] Ege Univ, Dept Astron & Space Sci, TR-35100 Izmir, Turkey

[15] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[16] NASA, Ames Res Ctr, Bay Area Environm Res Inst, Moffett Field, CA 94035 USA

[17] NASA, Ames Res Ctr, Orbital Sci Corp, Moffett Field, CA 94035 USA

[18] NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 729卷 / 01期

关键词：

open clusters and associations: individual (NGC 6819; NGC; 6791); stars: fundamental parameters; stars: interiors; stars: oscillations; SOLAR-LIKE OSCILLATIONS; RED GIANTS; PHOTOMETRY; PARAMETERS; EVOLUTION; RADIUS; STARS; OLD; AGE; CALIBRATION;

D O I：

10.1088/2041-8205/729/1/L10

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating the mass, radius, and log g of stars on the red giant branch (RGB) of these clusters, we estimate the distance to the clusters and their ages. Our model-independent estimate of the distance modulus of NGC 6791 is (m - M)(0) = 13.11 +/- 0.06. We find (m - M)(0) = 11.85 +/- 0.05 for NGC 6819. The average mass of stars on the RGB of NGC 6791 is 1.20 +/- 0.01 M-circle dot, while that of NGC 6819 is 1.68 +/- 0.03 M-circle dot. It should be noted that we do not have data that cover the entire RGB and the actual mass will be somewhat lower. We have determined model-dependent estimates of ages of these clusters. We find ages between 6.8 and 8.6 Gyr for NGC 6791, however, most sets of models give ages around 7 Gyr. We obtain ages between 2 and 2.4 Gyr for NGC 6819.

引用

页数：6

共 42 条

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