Reaching the end of the white dwarf cooling sequence in NGC 6791

被引：100

作者：

Bedin, Luigi R. ^{[1
]}

King, Ivan R. ^{[2
]}

Anderson, Jay ^{[1
,3
]}

Piotto, Giampaolo ^{[4
]}

Salaris, Maurizio ^{[5
]}

Cassisi, Santi ^{[6
]}

Serenelli, Aldo ^{[7
]}

机构：

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

[2] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[3] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[4] Univ Padua, Dipartimento Astron, I-35122 Padua, Italy

[5] Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England

[6] INAF Osservatorio Astron Collurania, I-64100 Teramo, Italy

[7] Inst Adv Study, Princeton, NJ 08540 USA

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 678卷 / 02期

基金：

英国科学技术设施理事会;

关键词：

open clusters and associations : individual (NGC 6791); white dwarfs;

D O I：

10.1086/529370

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new observations of the white dwarf sequence of the old open cluster NGC 6791. The brighter peak previously observed in the white dwarf luminosity function (WDLF) is now better delineated, and the second, fainter peak that we suggested earlier is now confirmed. A careful study suggests that we have reached the end of the WD sequence. The WDs that create the two peaks in the WDLF show a significant turn to the blue in the color-magnitude diagram. The discrepancy between the age from the WDs and that from the main-sequence turnoff remains, and we have an additional puzzle in the second peak in the WDLF. Canonical WD models seem to fail-at least at similar to 25% level-in reproducing the age of clusters of this metallicity. We discuss briefly possible ways of arriving at a theoretical understanding of the WDLF.

引用

页码：1279 / 1291

页数：13

共 39 条

[1]

Anderson J., 2006, 200601 ACS STSCI

[2]

ANDERSON J, 2008, AJ UNPUB

[3] The Hubble Ultra Deep Field [J].

Beckwith, Steven V. W. ;

Stiavelli, Massimo ;

Koekemoer, Anton M. ;

Caldwell, John A. R. ;

Ferguson, Henry C. ;

Hook, Richard ;

Lucas, Ray A. ;

Bergeron, Louis E. ;

Corbin, Michael ;

Jogee, Shardha ;

Panagia, Nino ;

Robberto, Massimo ;

Royle, Patricia ;

Somerville, Rachel S. ;

Sosey, Megan .

ASTRONOMICAL JOURNAL, 2006, 132 (05) :1729-1755

[4] The absolute motion of the peculiar cluster NGC 6791 [J].

Bedin, L. R. ;

Piotto, G. ;

Carraro, G. ;

King, I. R. ;

Anderson, J. .

ASTRONOMY & ASTROPHYSICS, 2006, 460 (02) :L27-L30

[5] The white dwarf cooling sequence in NGC 6791 [J].

Bedin, LR ;

Salaris, M ;

Piotto, G ;

King, IR ;

Anderson, J ;

Cassisi, S ;

Momany, Y .

ASTROPHYSICAL JOURNAL, 2005, 624 (01) :L45-L48

[6] Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system [J].

Bedin, LR ;

Cassisi, S ;

Castelli, F ;

Piotto, G ;

Anderson, J ;

Salaris, M ;

Momany, Y ;

Pietrinferni, A .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 357 (03) :1038-1048

[7]

Brown D, 2007, THESIS LIVERPOOL J M

[8] A search for planets in the old open cluster NGC 6791 [J].

Bruntt, H ;

Grundahl, F ;

Tingley, B ;

Frandsen, S ;

Stetson, PB ;

Thomsen, B .

ASTRONOMY & ASTROPHYSICS, 2003, 410 (01) :323-335

[9] NGC 6791: An exotic open cluster or the nucleus of a tidally disrupted galaxy? [J].

Carraro, G ;

Villanova, S ;

Demarque, P ;

McSwain, MV ;

Piotto, G ;

Bedin, LR .

ASTROPHYSICAL JOURNAL, 2006, 643 (02) :1151-1159

[10] TABLES OF THERMONUCLEAR REACTION-RATES FOR LOW-MASS NUCLEI C1 LESS-THAN-OR-EQUAL-TO Z LESS-THAN-OR-EQUAL-TO 14) [J].

CAUGHLAN, GR ;

FOWLER, WA ;

HARRIS, MJ ;

ZIMMERMAN, BA .

ATOMIC DATA AND NUCLEAR DATA TABLES, 1985, 32 (02) :197-233

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