Reaching the End of the White Dwarf Cooling Sequence in NGC 6791

Reaching the End of the White Dwarf Cooling Sequence in NGC 6791

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 th...

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Veröffentlicht in:The Astrophysical journal 2008-05, Vol.678 (2), p.1279-1291
Hauptverfasser: Bedin, Luigi R, King, Ivan R, Anderson, Jay, Piotto, Giampaolo, Salaris, Maurizio, Cassisi, Santi, Serenelli, Aldo
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container_issue 2
container_start_page 1279
container_title The Astrophysical journal
container_volume 678
creator Bedin, Luigi R
King, Ivan R
Anderson, Jay
Piotto, Giampaolo
Salaris, Maurizio
Cassisi, Santi
Serenelli, Aldo
description 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 [image]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.
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title Reaching the End of the White Dwarf Cooling Sequence in NGC 6791
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