On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting

doi:10.1088/1674-4527/10/3/008

YNAO OpenIR > 恒星物理研究组

	On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting
	Su J(苏杰); Li Y(李焱); Su, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2010-03
卷号	10 期号:3 页码:266-278
DOI	10.1088/1674-4527/10/3/008
产权排序	第1完成单位
收录类别	SCI
关键词	Convection Stars: Evolution Stars: White Dwarfs
摘要	We investigate the spectral evolution of white dwarfs by considering the effects of hydrogen mass in the atmosphere and convective overshooting above the convection zone. Our numerical results show that white dwarfs with M(H) similar to 10(-16) M(circle dot) show the DA spectral type between 46 000 less than or similar to T(eff) less than or similar to 26 000 K and the DO or DB spectral type may appear on either side of this temperature range. White dwarfs with M(H) similar to 10(-15) M(circle dot) appear as DA stars until they cool to T(eff) similar to 31 000 K; from then on they will evolve into DB white dwarfs as a result of convective mixing. If MH in the white dwarfs is more than 10(-14) M(circle dot), the convective mixing will not occur when T(eff) > 20 000 K, thus these white dwarfs always appear as DA stars. White dwarfs within the temperature range 46 000 less than or similar to T(eff) less than or similar to 31 000 K always show the DA spectral type, which coincides with the DB gap. We notice the importance of the convective overshooting and suggest that the overshooting length should be proportional to the thickness of the convection zone to better fit the observations.
项目资助者	National Key Fundamental Research [2007CB815406]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	1674-4527
URL	查看原文
归档日期	2010-06-23
WOS记录号	WOS:000275962900008
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	NEUTRINO ENERGY-LOSS ; LIQUID-METAL PHASE ; THERMAL-CONDUCTIVITIES ; STELLAR INTERIORS ; DENSE MATTER ; PULSATIONS ; STARS ; STATE
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5204
专题	恒星物理研究组
通讯作者	Su, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式 GB/T 7714	Su J,Li Y,Su, J . On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2010,10(3):266-278.
APA	Su J,Li Y,&Su, J .(2010).On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,10(3),266-278.
MLA	Su J,et al."On the DB gap of white dwarf evolution: effects of hydrogen mass fraction and convective overshooting".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 10.3(2010):266-278.

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