Published in

American Astronomical Society, Astrophysical Journal Letters, 1(708), p. L32-L35, 2009

DOI: 10.1088/2041-8205/708/1/l32

Links

Tools

Export citation

Search in Google Scholar

The Bottom of the White Dwarf Cooling Sequence in the Old Open Cluster NGC 2158

Journal article published in 2009 by L. R. Bedin ORCID, Bedin Lr, M. Salaris, King Ir, I. R. King, G. Piotto ORCID, J. Anderson, S. Cassisi ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

Full text: Download

Red circle
Preprint: archiving forbidden
Red circle
Postprint: archiving forbidden
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

Abstract

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 ~1.8 and ~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. Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555, under GO-10500.