@article{af011886b2f4420eb4b3657d0ce1f214,
title = "Hubble space telescope observations of white dwarfs in the globular cluster m41",
abstract = "With the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope, we have discovered in M4 (NGC 6121, C1620—264) the first extensive sequence of cooling white dwarfs seen in a globular cluster. Adopting a distance modulus of (m — M)V = 12.65 and a reddening of E(B — V) = 0.37, we show that the sequence, which extends over 9 < MU < 13, is comprised of white dwarfs of mass -0.5 M0. The total mass loss from the present turnoff to the white dwarf sequence is 0.31 M0, and the intrinsic dispersion in the mean mass appears to be <0.05 M0. Both the location of the white dwarf cooling sequence in the cluster color-magnitude diagram and the cumulative luminosity function attest to the basic correctness and completeness of the physics in theoretical models for the upper three magnitudes of the observed white dwarf cooling sequence. To test the theory in globular clusters at cooling ages beyond -3 X 108 yr will require deeper and more complete data.",
author = "Richer, {Harvey B.} and Fahlman, {Gregory G.} and Ibata, {Rodrigo A.} and Stetson, {Peter B.} and Bell, {Roger A.} and Michael Bolte and Bond, {Howard E.} and Harris, {William E.} and Hesser, {James E.} and Georgi Mandushev and Carlton Pryor and Vandenberg, {Don A.}",
note = "Funding Information: Four astronomers provided us with unpublished data and theoretical calculations which made possible most of the analysis undertaken in this contribution. These were Pierre Bergeron, Conard Dahn, Jon Holtzman, and Matt Wood. We are indebted to them as much of what has been accomplished in this contribution would not have been possible without their generosity. Karen Schaefer provided excellent support handling the data tapes at the Space Telescope Science Institute. The research of H. B. R., G. G. F., W. E. H., and D. V. B. is supported by grants from the Natural Sciences and Engineering Research Council of Canada. Support for work by R. A. B., M. B., H. E. B., and C. P. was provided by NASA through grants from the Space Telescope Science Institute, which is operated by the Associated Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.",
year = "1995",
month = sep,
day = "20",
doi = "10.1086/309674",
language = "English (US)",
volume = "451",
pages = "L17--L20",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "1",
}