Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-09
Astronomy and Astrophysics
Astrophysics
29 pages, 10 figures (4 in low resolution), 1 table. Accepted (2007 December 19) on ApJ
Scientific paper
10.1086/529370
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 white dwarf 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 ~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.
Anderson Jeffrey
Bedin Luigi R.
Cassisi Santi
King Ivan R.
Piotto Giampaolo
No associations
LandOfFree
Reaching the End of the White Dwarf Cooling Sequence in NGC 6791 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Reaching the End of the White Dwarf Cooling Sequence in NGC 6791, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reaching the End of the White Dwarf Cooling Sequence in NGC 6791 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-669321