NEW PULSATING DB WHITE DWARF STARS FROM THE SLOAN DIGITAL SKY SURVEY

被引：29

作者：

Nitta, A. ^{[1
,2
]}

Kleinman, S. J. ^{[1
]}

Krzesinski, J. ^{[3
]}

Kepler, S. O. ^{[4
]}

Metcalfe, T. S. ^{[5
]}

Mukadam, Anjum S. ^{[6
]}

Mullally, Fergal ^{[7
]}

Nather, R. E. ^{[8
]}

Sullivan, Denis J. ^{[9
]}

Thompson, Susan E. ^{[10
]}

Winget, D. E. ^{[8
]}

机构：

[1] Gemini Observ, Hilo, HI 96720 USA

[2] Subaru Telescope, Hilo, HI 96720 USA

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

[4] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

[5] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA

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

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

[8] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

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

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

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 690卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

stars: general; stars: oscillations; stars: variables: other; white dwarfs; EARTH TELESCOPE OBSERVATIONS; HYDROGEN LAYER; DATA RELEASE; C-12(ALPHA; DISCOVERY; THICKNESS; SPECTRA; CATALOG;

D O I：

10.1088/0004-637X/690/1/560

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We are searching for new He atmosphere white dwarf pulsators (DBVs) based on the newly found white dwarf stars from the spectra obtained by the Sloan Digital Sky Survey. DBVs pulsate at hotter temperature ranges than their better known cousins, the H atmosphere white dwarf pulsators (DAVs or ZZ Ceti stars). Since the evolution of white dwarf stars is characterized by cooling, asteroseismological studies of DBVs give us opportunities to study white dwarf structure at a different evolutionary stage than the DAVs. The hottest DBVs are thought to have neutrino luminosities exceeding their photon luminosities, a quantity measurable through asteroseismology. Therefore, they can also be used to study neutrino physics in the stellar interior. So far we have discovered nine new DBVs, doubling the number of previously known DBVs. Here we report the new pulsators' light curves and power spectra.

引用

页码：560 / 565

页数：6

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