A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope

S. O. Kepler; D. E. Winget; R. E. Nather; P. A. Bradley; A. D. Grauer; G. Fontaine; P. Bergeron; G. Vauclair; C. F. Claver; T. M.K. Marar; S. Seetha; B. N. Ashoka; T. Mazeh; E. Leibowitz; N. Dolez; M. Chevreton; M. A. Barstow; J. C. Clemens; S. J. Kleinman; A. E. Sansom; R. W. Tweedy; A. Kanaan; B. P. Hine; J. L. Provencal; F. Wesemael; M. A. Wood; P. Brassard; J. E. Solheim; P. I. Emanuelsen

doi:10.1086/186138

A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope

S. O. Kepler^*, D. E. Winget, R. E. Nather, P. A. Bradley, A. D. Grauer, G. Fontaine, P. Bergeron, G. Vauclair, C. F. Claver, T. M.K. Marar, S. Seetha, B. N. Ashoka, T. Mazeh, E. Leibowitz, N. Dolez, M. Chevreton, M. A. Barstow, J. C. Clemens, S. J. Kleinman, A. E. SansomR. W. Tweedy, A. Kanaan, B. P. Hine, J. L. Provencal, F. Wesemael, M. A. Wood, P. Brassard, J. E. Solheim, P. I. Emanuelsen

^*Corresponding author for this work

School of Physics and Astronomy

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Abstract

We have detected the time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117-B15A, using the Whole Earth Telescope (WET). The observed rate of period change, Ṗ = (12.0 ± 3.5) × 10^-15 s s^-1, is somewhat larger than the published theoretical calculations of the rate of period change due to cooling, based on carbon core white dwarf models. We discuss other effects that could contribute to the observed rate of period change.

Original language	English
Pages (from-to)	L45-L48
Journal	Astrophysical Journal
Volume	378
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/186138
State	Published - 10 Sep 1991

Keywords

Stars: evolution
Stars: variables
Stars: white dwarfs

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Kepler, S. O., Winget, D. E., Nather, R. E., Bradley, P. A., Grauer, A. D., Fontaine, G., Bergeron, P., Vauclair, G., Claver, C. F., Marar, T. M. K., Seetha, S., Ashoka, B. N., Mazeh, T., Leibowitz, E., Dolez, N., Chevreton, M., Barstow, M. A., Clemens, J. C., Kleinman, S. J., ... Emanuelsen, P. I. (1991). A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope. Astrophysical Journal, 378(2 PART 2), L45-L48. https://doi.org/10.1086/186138

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title = "A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope",

abstract = "We have detected the time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117-B15A, using the Whole Earth Telescope (WET). The observed rate of period change, Ṗ = (12.0 ± 3.5) × 10-15 s s-1, is somewhat larger than the published theoretical calculations of the rate of period change due to cooling, based on carbon core white dwarf models. We discuss other effects that could contribute to the observed rate of period change.",

keywords = "Stars: evolution, Stars: variables, Stars: white dwarfs",

author = "Kepler, {S. O.} and Winget, {D. E.} and Nather, {R. E.} and Bradley, {P. A.} and Grauer, {A. D.} and G. Fontaine and P. Bergeron and G. Vauclair and Claver, {C. F.} and Marar, {T. M.K.} and S. Seetha and Ashoka, {B. N.} and T. Mazeh and E. Leibowitz and N. Dolez and M. Chevreton and Barstow, {M. A.} and Clemens, {J. C.} and Kleinman, {S. J.} and Sansom, {A. E.} and Tweedy, {R. W.} and A. Kanaan and Hine, {B. P.} and Provencal, {J. L.} and F. Wesemael and Wood, {M. A.} and P. Brassard and Solheim, {J. E.} and Emanuelsen, {P. I.}",

year = "1991",

month = sep,

day = "10",

doi = "10.1086/186138",

language = "אנגלית",

volume = "378",

pages = "L45--L48",

journal = "Astrophysical Journal",

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Kepler, SO, Winget, DE, Nather, RE, Bradley, PA, Grauer, AD, Fontaine, G, Bergeron, P, Vauclair, G, Claver, CF, Marar, TMK, Seetha, S, Ashoka, BN, Mazeh, T , Leibowitz, E, Dolez, N, Chevreton, M, Barstow, MA, Clemens, JC, Kleinman, SJ, Sansom, AE, Tweedy, RW, Kanaan, A, Hine, BP, Provencal, JL, Wesemael, F, Wood, MA, Brassard, P, Solheim, JE & Emanuelsen, PI 1991, 'A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope', Astrophysical Journal, vol. 378, no. 2 PART 2, pp. L45-L48. https://doi.org/10.1086/186138

TY - JOUR

T1 - A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope

AU - Kepler, S. O.

AU - Winget, D. E.

AU - Nather, R. E.

AU - Bradley, P. A.

AU - Grauer, A. D.

AU - Fontaine, G.

AU - Bergeron, P.

AU - Vauclair, G.

AU - Claver, C. F.

AU - Marar, T. M.K.

AU - Seetha, S.

AU - Ashoka, B. N.

AU - Mazeh, T.

AU - Leibowitz, E.

AU - Dolez, N.

AU - Chevreton, M.

AU - Barstow, M. A.

AU - Clemens, J. C.

AU - Kleinman, S. J.

AU - Sansom, A. E.

AU - Tweedy, R. W.

AU - Kanaan, A.

AU - Hine, B. P.

AU - Provencal, J. L.

AU - Wesemael, F.

AU - Wood, M. A.

AU - Brassard, P.

AU - Solheim, J. E.

AU - Emanuelsen, P. I.

PY - 1991/9/10

Y1 - 1991/9/10

N2 - We have detected the time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117-B15A, using the Whole Earth Telescope (WET). The observed rate of period change, Ṗ = (12.0 ± 3.5) × 10-15 s s-1, is somewhat larger than the published theoretical calculations of the rate of period change due to cooling, based on carbon core white dwarf models. We discuss other effects that could contribute to the observed rate of period change.

AB - We have detected the time rate of change for the main pulsation period of the 13,000 K DA white dwarf G117-B15A, using the Whole Earth Telescope (WET). The observed rate of period change, Ṗ = (12.0 ± 3.5) × 10-15 s s-1, is somewhat larger than the published theoretical calculations of the rate of period change due to cooling, based on carbon core white dwarf models. We discuss other effects that could contribute to the observed rate of period change.

KW - Stars: evolution

KW - Stars: variables

KW - Stars: white dwarfs

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SN - 0004-637X

VL - 378

SP - L45-L48

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

A detection of the evolutionary time scale of the DA white dwarf G117- B15A with the whole earth telescope

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Keywords

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