PULSATIONAL MAPPING OF CALCIUM ACROSS THE SURFACE OF A WHITE DWARF

被引：13

作者：

Thompson, Susan E. ^{[1
,2
]}

Montgomery, M. H. ^{[2
,3
]}

von Hippel, T. ^{[3
,4
]}

Nitta, A. ^{[5
,6
]}

Dalessio, J. ^{[1
,2
]}

Provencal, J. ^{[1
,2
]}

Strickland, W. ^{[7
]}

Holtzman, J. A. ^{[8
]}

Mukadam, A. ^{[9
]}

Sullivan, D. ^{[10
]}

Nagel, T. ^{[10
]}

Koziel-Wierzbowska, D. ^{[11
]}

Kundera, T. ^{[11
]}

Zola, S. ^{[11
,12
]}

Winiarski, M. ^{[12
]}

Drozdz, M. ^{[12
]}

Kuligowska, E. ^{[11
]}

Ogloza, W. ^{[12
]}

Bognar, Zs. ^{[13
]}

Handler, G. ^{[14
]}

Kanaan, A. ^{[15
]}

Ribeira, T. ^{[15
]}

Rosen, R. ^{[16
]}

Reichart, D. ^{[17
]}

Haislip, J. ^{[17
]}

Barlow, B. N. ^{[17
]}

Dunlap, B. H. ^{[17
]}

Ivarsen, K. ^{[17
]}

LaCluyze, A. ^{[17
]}

Mullally, F. ^{[18
]}

机构：

[1] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[2] Mt Cuba Observ, Delaware Asteroseism Res Ctr, Greenville, DE 19807 USA

[3] Univ Texas Austin, Dept Astron, Univ Stn 1, Austin, TX 78712 USA

[4] Siena Coll, Dept Phys & Astron, Loudonville, NY 12211 USA

[5] Gemini Observ, Hilo, HI 96720 USA

[6] Natl Inst Nat Sci, Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA

[7] PJ Meyer Observ, Clifton, TX 76634 USA

[8] New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA

[9] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[10] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand

[11] Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland

[12] Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland

[13] Konkoly Observ Budapest, H-1525 Budapest XII, Hungary

[14] Univ Vienna, Inst Astron, A-1180 Vienna, Austria

[15] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil

[16] Natl Radio Astron Observ, Green Bank, WV 24944 USA

[17] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[18] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 714卷 / 01期

基金：

美国国家科学基金会;

关键词：

accretion; accretion disks; stars: individual (G29-38); stars: oscillations; white dwarfs; ZZ CETI STARS; WHOLE EARTH TELESCOPE; OSCILLATING AP STARS; MODE-IDENTIFICATION; GRAVITY MODES; G29-38; SPECTROSCOPY; ACCRETION; METALS; ASTEROSEISMOLOGY;

D O I：

10.1088/0004-637X/714/1/296

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We constrain the distribution of calcium across the surface of the white dwarf star G29-38 by combining time-series spectroscopy from Gemini-North with global time-series photometry from the Whole Earth Telescope. G29-38 is actively accreting metals from a known debris disk. Since the metals sink significantly faster than they mix across the surface, any inhomogeneity in the accretion process will appear as an inhomogeneity of the metals on the surface of the star. We measure the flux amplitudes and the calcium equivalent width amplitudes for two large pulsations excited on G29-38 in 2008. The ratio of these amplitudes best fits a model for polar accretion of calcium and rules out equatorial accretion.

引用

页码：296 / 308

页数：13

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