The Impact of Nova Outbursts on the Chemical Abundance of the Interstellar Medium

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外文摘要：Nova outbursts are the results of thermonuclear runaways,which occur when sufficient material accretes on the surfaces of white dwarfs(WDs).Using the MESA code,we construct a detailed grid for carbon-oxygen and oxygen-neon-magnesium novae.By employing population synthesis methods,we conduct a statistical analysis of the distribution of novae in the Milky Way.In our models,on average,a typical nova system may undergo about 8000 eruptions and the Galactic nova rate is ∼130 yr-1.The C,N,and O elements in nova ejecta are strongly affected by the mixing degree between WD core and accreted material.Our results show that the average value of 12C/13C in nova ejecta is about an order of magnitude lower than that on the surface of a red giant,that for 16O/17O is about 5 times lower,and that for 14N/15N is about 1.5 times lower.The annual yields of 13C,15N,and 17O from nova ejection are larger than those from AGB stars.This indicates that compared to a red giant,nova eruptions are a more important source of the odd-numbered nuclear elements of 13C,15N,and 17O in the Galactic interstellar medium.

外文关键词：

ISMabundances-(stars:)novae-cataclysmic variables-(stars:)white dwarfs

作者：

Guoli He、Chunhua Zhu、Guoliang Lü、Lin Li、Sufen Guo、Helei Liu、Jun Gao

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作者单位：

School of Physical Science and Technology,Xinjiang University,Urumqi 830017,China

Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China

基金：

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)science research grants from the China Manned Space ProjectNatural Science Foundation of XinjiangNatural Science Foundation of Xinjiang

项目编号：

12163005U203120412373038CMSCSST-2021-A102022D01D852022TSYCLJ0006

出版年：

2024

DOI：

10.1088/1674-4527/ad7899

天文和天体物理学研究

中国科学院国家天文台

天文和天体物理学研究

CSTPCD

影响因子：0.406

ISSN：1674-4527

年,卷(期)：2024.24(10)