Nucleosynthesis in Population III Stars and Chemical Abundances of Extremely Metal-Poor Stars
III族恒星的核合成和极度贫金属恒星的化学丰度
基本信息
- 批准号:14540223
- 负责人:
- 金额:$ 2.69万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The first generation of stars, called Population III stars, in the Universe do not contain heavy elements. In this study, we tried to investigate their nature from the comparison between nucleosynthesis and the chemical abundances of extremely metal-poor (EMP) stars. We focus on the peculiar abundance pattern of EMP stars. For example, (Mn, Cr)/Fe decrease while (Zn, Co)/Fe increase toward smaller metallicity. Such an abundance pattern may stem from nucleosynthesis in Pop III stars.In the first year of this study, we calculated the evolution and explosions of Pop III stars for a wide range of stellar masses and explosion energies and found interesting features of their nucleosynthesis In the second year, we extended our study to the aspherical explosion models. Our findings are summarized as follows:1)We found that nucleosynthesis in Hypernova explosions can explain the above abundance patterns of EMP stars.2)Pair instability supernovae in 130-300 M_【of sun】 stars cannot explain the abundances of EMP stars.3)Among the EMP stars, many C and N-rich stars with quite large rations of (C, N)/Fe have been discovered. we showed that such large rations can be explained with the black-hole-forming supernovae.4)Variations among the C-rich EMP stars can be explained with the mixing and the fallback mechanism.5)This implies many black-holes were formed from the first generation supernovae.6)Bipolar explosions induce naturally the mixing-fallback like events.
第一代恒星,称为第三星族星,在宇宙中不包含重元素。在这项研究中,我们试图从核合成和极贫金属(EMP)星的化学丰度之间的比较来探讨它们的本质。我们专注于EMP星的特殊丰度模式。例如,(Mn,Cr)/Fe减小,而(Zn,Co)/Fe增加,朝向更小的金属丰度。在第一年的研究中,我们计算了Pop III星在不同质量和爆炸能量下的演化和爆炸,发现了它们核合成的有趣特征。第二年,我们将研究扩展到非球面爆炸模型。结果表明:(1)超新星爆发中的核合成可以解释EMP星的上述丰度分布;(2)130-300 M_[太阳]星中的对不稳定性超新星不能解释EMP星的丰度分布;(3)在EMP星中,发现了许多富C和富N星,它们的(C,N)/Fe比值相当大。我们表明,如此大的比例可以用黑洞形成超新星来解释。4)富碳电磁脉冲恒星之间的变化可以用混合和回落机制来解释。5)这意味着许多黑洞是由第一代超新星形成的。6)双极爆炸自然会诱发类似混合回落的事件。
项目成果
期刊论文数量(28)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Mazzali, P.A., Deng, J., Tominaga, N., Maeda, K., Nomoto, K., Matheson, T., Kawabata, K.S., Stanek, K.Z., Garnavich, P.M.: "The Type Ic Hypernova SN 2003dh/GRB 030329"Astrophys.J.. 599. L95-L98 (2003)
Mazzali, P.A.、Deng, J.、Tominaga, N.、Maeda, K.、Nomoto, K.、Matheson, T.、Kawabata, K.S.、Stanek, K.Z.、Garnavich, P.M.:“Ic 型超新星 SN 2003dh/GRB
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- 影响因子:0
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- 通讯作者:
Umeda, H., Nomoto, K.: "First-generation black-hole-forming supernovae and the metal abundance pattern of a very iron-poor star"Nature. 422. 871-873 (2003)
Umeda, H., Nomoto, K.:“第一代黑洞形成超新星和贫铁恒星的金属丰度模式”《自然》。
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Kawabata, K.S, Jeffery, D.J.Iye, M., Ohyama, Y., Kosugi, G., Kashikawa, N., Ebizuka, N., Sasaki, T., Sekiguchi, K., Nomoto, K., azzali, P.A., Eeng, j.,, k.: "Spectropolarimetry of SN 2002ap: A High Velocity Asymmetric Explosion"ApJ. 580. L39-L42 (2002)
川端,K.S,杰弗里,D.J.Iye,M.,Ohyama,Y.,小杉,G.,柏川,N.,Ebizuka,N.,佐佐木,T.,关口,K.,野本,K.,阿扎利,P.A.
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- 影响因子:0
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Nozawa, T., Kozasa, T., Umeda, H., Maeda, K., Nomoto, K.: "Dust in the Early Universe : Dust Formation in the Ejecta of Population III Supernovae"Astrophys.J.. 598. 785-803 (2003)
野泽 T.、小笠 T.、梅田 H.、前田 K.、野本 K.:“早期宇宙中的尘埃:第三族超新星喷射物中的尘埃形成”Astrophys.J. 598. 785
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Kinugasa, K., Kawakita, H., Ayani, K., Kawabata, T., Yamaoka, H., Deng, J., Mazzali, P.A., Maeda K., Nomoto, K.: "Early-Phase Spectra of "Hypernova" SN 2002ap"ApJ. 577. L97-L101 (2002)
Kinugasa, K.、Kawakita, H.、Ayani, K.、Kawabata, T.、Yamaoka, H.、Deng, J.、Mazzali, P.A.、Maeda K.、Nomoto, K.:“早期相光谱”
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NOMOTO Ken'ichi其他文献
NOMOTO Ken'ichi的其他文献
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{{ truncateString('NOMOTO Ken'ichi', 18)}}的其他基金
The first and second generations of population III supernovae and their nucleosynthesis
第一代和第二代III族超新星及其核合成
- 批准号:
23540262 - 财政年份:2011
- 资助金额:
$ 2.69万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Providing the initial mass function of the first-generation stars of the universe with a peculiar chemical abundance pattern of metal-poor stars
提供宇宙第一代恒星的初始质量函数以及贫金属恒星特有的化学丰度模式
- 批准号:
20540226 - 财政年份:2008
- 资助金额:
$ 2.69万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Typical Masses of First Stars and the Origin of the Peculiar Elemental Abundances in the Early Universe
第一代恒星的典型质量和早期宇宙中特殊元素丰度的起源
- 批准号:
18540231 - 财政年份:2006
- 资助金额:
$ 2.69万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Did Hypernova Explosions of the First Generation Stars Produce the Chemical Peculiarity of the Objects in Early Universe?
第一代恒星的超新星爆炸是否产生了早期宇宙物体的化学特性?
- 批准号:
16540229 - 财政年份:2004
- 资助金额:
$ 2.69万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Studies on the pulsar and circumstellar ring of the supernova 1987A
超新星1987A脉冲星和星周环的研究
- 批准号:
04640265 - 财政年份:1992
- 资助金额:
$ 2.69万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Co-operative Study of Compact and Diffuse Remnants in Supernova 1987A
1987A 超新星致密和弥散遗迹的合作研究
- 批准号:
02302024 - 财政年份:1990
- 资助金额:
$ 2.69万 - 项目类别:
Grant-in-Aid for Co-operative Research (A)
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