期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 708, 期 1, 页码 L32-L35出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/708/1/L32
关键词
Hertzsprung-Russell diagram; open clusters and associations: individual (NGC 2158); white dwarfs
资金
- STScI [GO-10500]
- ASI [ASI-INAF I/016/07/0]
- STFC [PP/E001149/1, ST/H002391/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H002391/1, PP/E001149/1] Funding Source: researchfish
We use 10 orbits of Advanced Camera for Surveys observations to reach the end of the white dwarf (WD) cooling sequence in the solar-metallicity open cluster NGC 2158. Our photometry and completeness tests show that the end falls at magnitude m(F606W) = 27.5 +/- 0.15, which implies an age between similar to 1.8 and similar to 2.0 Gyr, consistent with the age of 1.9 +/- 0.2 Gyr obtained from fits to the main-sequence turn-off. The faintest WDs show a clear turn toward bluer colors, as predicted by theoretical isochrones.
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