猎户座δ sct型脉动星V1162的三点光度监测:周期变化及其对前主序演化的意义

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Seung-Lee Kim, S. Cha, B. Lim, Jae Woo Lee, Chung-Uk Lee, Yongseok Lee, Dong Jin Kim, Dong-Joo Lee, J. Koo, K. Hong, Y. Ryu, Byeong-Gon Park
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引用次数: 1

摘要

从2014年12月中旬到2015年3月初,我们对δ Sct恒星V1162猎户座进行了49个晚上的广泛监测。这些观测是由安装在智利、南非和澳大利亚的3台KMTNet(韩国微透镜望远镜网络)1.6米望远镜完成的。对数据进行多频分析,结果清晰地检测出7个频率,没有混叠问题:5个已知频率和2个新频率,幅度较小,为1.2-1.7 mmag。除一个频率外,所有频率的振幅都与先前的结果有显著差异,证实了长期振幅变化的存在。我们利用从我们的数据和文献中收集到的最大光的时间,研究了大约30年来V1162 Ori的脉动时间变化。O−C(观测值减去计算值)时序图显示了一个周期递减率为(1/P)的向下抛物线型变化(dP/dt = - 4.22 × 10−6 year - 1)和一个周期约为2780天的周期变化。这种循环变化最可能的解释是由一个未知的双星伴星引起的光传播时间效应,它的最小质量为0.69 M⊙。猎户座V1162是第一颗δ sct型脉动星,其观测到的快周期减少可以解释为前主序星的演化效应,考虑到它是猎户座OB - 1c星协的成员。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-Site Photometric Monitoring of the δ Sct-Type Pulsating Star V1162 Orionis: Period Change and its Implications for Pre-Main Sequence Evolution
We present photometric results of the δ Sct star V1162 Ori, which is extensively monitored for a total of 49 nights from mid-December 2014 to early-March 2015. The observations are made with three KMTNet (Korea Microlensing Telescope Network) 1.6 m telescopes installed in Chile, South Africa, and Australia. Multiple frequency analysis is applied to the data and resulted in clear detection of seven frequencies without an alias problem: five known frequencies and two new ones with small amplitudes of 1.2-1.7 mmag. The amplitudes of all but one frequency are significantly different from previous results, confirming the existence of long-term amplitude changes. We examine the variations in pulsation timings of V1162 Ori for about 30 years by using the times of maximum light obtained from our data and collected from the literatures. The O − C (Observed minus Calculated) timing diagram shows a combination of a downward parabolic variation with a period decreasing rate of (1/P)dP/dt = −4.22 × 10 −6 year −1 and a cyclic change with a period of about 2780 days. The most probable explanation for this cyclic variation is the light-travel-time effect caused by an unknown binary companion, which has a minimum mass of 0.69 M ⊙ . V1162 Ori is the first δ Sct-type pulsating star of which the observed fast period decrease can be interpreted as an evolutionary effect of a pre-main sequence star, considering its membership of the Orion OB 1c association.
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来源期刊
Journal of the Korean Astronomical Society
Journal of the Korean Astronomical Society 地学天文-天文与天体物理
CiteScore
1.30
自引率
10.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.
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