A DETECTION OF THE EVOLUTIONARY TIME SCALE OF THE DA WHITE-DWARF G117-B15A WITH THE WHOLE EARTH TELESCOPE

被引：72

作者：

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

机构：

[1] OBSERV MIDI PYRENEES,F-31400 TOULOUSE,FRANCE

[2] ISRO,CTR SATELLITE,DIV TECH PHYS,BANGALORE 560017,INDIA

[3] OBSERV PARIS,F-921925 PRINCIPAL,FRANCE

[4] UNIV TROMSO,INST MATH & PHYS SCI,N-9000 TROMSO,NORWAY

[5] UNIV MONTREAL,DEPT PHYS,MONTREAL H3C 3J7,QUEBEC,CANADA

[6] UNIV TEXAS,MCDONALD OBSERV,AUSTIN,TX 78712

[7] UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712

[8] UNIV ARKANSAS,DEPT PHYS & ASTRON,LITTLE ROCK,AR 72204

[9] TEL AVIV UNIV,SACKLER FAC EXACT SCI,WISE OBSERV,IL-69978 TEL AVIV,ISRAEL

[10] UNIV LEICESTER,DEPT PHYS & ASTRON,LEICESTER LE1 7RH,ENGLAND

[11] NASA,AMES RES CTR,MOFFETT FIELD,CA 94035

来源：

ASTROPHYSICAL JOURNAL | 1991年 / 378卷 / 02期

关键词：

STARS; EVOLUTION; VARIABLES; WHITE DWARFS;

D O I：

10.1086/186138

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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, P = (12.0 +/- 3.5) x 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.

引用

页码：L45 / L48

页数：4

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