没有星际物质吸积的V1719 Cyg: δ Scuti型恒星的化学成分

IF 0.6 Q4 ASTRONOMY & ASTROPHYSICS

Journal of Astronomy and Space Sciences Pub Date : 2020-09-01 DOI:10.5140/JASS.2020.37.3.157

A. Yushchenko, Chulhee Kim, Yeuncheol Jeong, D. Doikov, V. Yushchenko, S. V. Khrapatyi, A. Demessinova

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引用次数: 0

摘要

韩国宝贤山光学天文台1.8米望远镜对V1719 Cyg进行了高分辨率光谱观测。光谱分辨能力R= 45000，信噪比S/N>100。用光谱合成方法测定了从碳到镝的28种化学元素的丰度。氧、钛、钒和Z>30元素的丰度相对于太阳值超标0.2 ~ 0.9个指数。推导出的丰度与这些元素的冷凝温度和二次电离势的关系进行了讨论。来自星际环境的吸积可能的影响不像ρ Pup和其他具有相似温度的恒星那么强烈。没有吸积的迹象。化学成分与太阳系r-和s-过程丰度模式的比较表明s-过程元素对光球的增强作用。

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The Chemical Composition of V1719 Cyg: δ Scuti Type Star without the Accretion of Interstellar Matter

High resolution spectroscopic observation of V1719 Cyg were made at 1.8 meter telescope of Bohyunsan Optical Astronomy observatory in Korea. Spectral resolving power was R=45,000, signal to noise ratio S/N>100. The abundances of 28 chemical elements from carbon to dysprosium were found with the spectrum synthesis method. The abundances of oxygen, titanium, vanadium and elements with Z>30 are overabundant by 0.2–0.9 dex with respect to the solar values. Correlations of derived abundances with condensation temperatures and second ionization potentials of these elements are discussed. The possible influence of accretion from interstellar environment is not so strong as for ρ Pup and other stars with similar temperatures. The signs of accretion are absent. The comparison of chemical composition with solar system r- & s-process abundance patterns shows the enhancement of the photosphere by s-process elements.

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来源期刊

Journal of Astronomy and Space Sciences ASTRONOMY & ASTROPHYSICS-

CiteScore

1.30

自引率

20.00%

发文量

审稿时长

12 weeks

期刊介绍： JASS aims for the promotion of global awareness and understanding of space science and related applications. Unlike other journals that focus either on space science or on space technologies, it intends to bridge the two communities of space science and technologies, by providing opportunities to exchange ideas and viewpoints in a single journal. Topics suitable for publication in JASS include researches in the following fields: space astronomy, solar physics, magnetospheric and ionospheric physics, cosmic ray, space weather, and planetary sciences; space instrumentation, satellite dynamics, geodesy, spacecraft control, and spacecraft navigation. However, the topics covered by JASS are not restricted to those mentioned above as the journal also encourages submission of research results in all other branches related to space science and technologies. Even though JASS was established on the heritage and achievements of the Korean space science community, it is now open to the worldwide community, while maintaining a high standard as a leading international journal. Hence, it solicits papers from the international community with a vision of global collaboration in the fields of space science and technologies.