{"title":"探测HD 137949振荡中的振幅调制和脉动能量再分布","authors":"C.N. Ofodum , P.N. Okeke , B.I. Okere","doi":"10.1016/j.newast.2023.102176","DOIUrl":null,"url":null,"abstract":"<div><p><span>We present the result of over 50-h of Johnson-B photometric observation of HD 137949. These high-speed photometric data were acquired between June 12 and August 19 2013 using the 0.5-m telescope of the South African Astronomical Observatory (SAAO). The result of our frequency analysis when compared with that of similar B-light photometric data obtained in 1981 and 1987 using the same telescope reveals the existence of a long-term stability in its principal frequency of oscillation at </span><span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>014781</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>000003</mn></mrow></math></span> mHz; even with the excitation of two new secondary oscillations (<span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>016787</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>000006</mn></mrow></math></span> mHz; <span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>012628</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>000009</mn></mrow></math></span> mHz). On the contrary, the signature of its principal amplitude of oscillation (<span><math><mi>A</mi></math></span>) was found to have changed drastically within a time-span of about three decades. However, the aggregate amplitude (<span><math><mrow><mo>∑</mo><mi>A</mi></mrow></math></span>) of all the detected oscillations was observed to have remained constant within the period under investigation. In addition, HD 137949 was observed to have undergone pulsational energy re-distribution within this time-span of about three decades; with a signature that is suggestive of non-conservation of its total energy (pulsational). We discuss the possible implications of the recently observed dynamics in the oscillation-signature of HD 137949.</p></div>","PeriodicalId":54727,"journal":{"name":"New Astronomy","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Probing the amplitude modulation and pulsational energy re-distribution in the oscillation of HD 137949\",\"authors\":\"C.N. Ofodum , P.N. Okeke , B.I. Okere\",\"doi\":\"10.1016/j.newast.2023.102176\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p><span>We present the result of over 50-h of Johnson-B photometric observation of HD 137949. These high-speed photometric data were acquired between June 12 and August 19 2013 using the 0.5-m telescope of the South African Astronomical Observatory (SAAO). The result of our frequency analysis when compared with that of similar B-light photometric data obtained in 1981 and 1987 using the same telescope reveals the existence of a long-term stability in its principal frequency of oscillation at </span><span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>014781</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>000003</mn></mrow></math></span> mHz; even with the excitation of two new secondary oscillations (<span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>016787</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>000006</mn></mrow></math></span> mHz; <span><math><mrow><msub><mrow><mi>ν</mi></mrow><mrow><mn>3</mn></mrow></msub><mo>=</mo><mn>2</mn><mo>.</mo><mn>012628</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>000009</mn></mrow></math></span> mHz). On the contrary, the signature of its principal amplitude of oscillation (<span><math><mi>A</mi></math></span>) was found to have changed drastically within a time-span of about three decades. However, the aggregate amplitude (<span><math><mrow><mo>∑</mo><mi>A</mi></mrow></math></span>) of all the detected oscillations was observed to have remained constant within the period under investigation. In addition, HD 137949 was observed to have undergone pulsational energy re-distribution within this time-span of about three decades; with a signature that is suggestive of non-conservation of its total energy (pulsational). We discuss the possible implications of the recently observed dynamics in the oscillation-signature of HD 137949.</p></div>\",\"PeriodicalId\":54727,\"journal\":{\"name\":\"New Astronomy\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.9000,\"publicationDate\":\"2023-12-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"New Astronomy\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S138410762300177X\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"New Astronomy","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S138410762300177X","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
摘要
我们展示了对 HD 137949 超过 50 小时的约翰逊-B 测光观测结果。这些高速测光数据是在2013年6月12日至8月19日期间利用南非天文台(SAAO)的0.5米望远镜获得的。我们的频率分析结果与 1981 年和 1987 年利用同一望远镜获得的类似 B 光光度测量数据进行了比较,发现其主振荡频率长期稳定在 ν1=2.014781±0.000003 mHz;即使激发了两个新的次级振荡(ν2=2.016787±0.000006 mHz;ν3=2.012628±0.000009 mHz)。相反,其主振幅(A)的特征在大约三十年的时间跨度内发生了急剧变化。然而,所有探测到的振荡的总振幅(∑A)在调查期内保持不变。此外,还观察到 HD 137949 在这大约三十年的时间跨度内经历了脉动能量的重新分配;其特征表明其总能量(脉动)并不守恒。我们将讨论最近观测到的动态对 HD 137949 的振荡特征可能产生的影响。
Probing the amplitude modulation and pulsational energy re-distribution in the oscillation of HD 137949
We present the result of over 50-h of Johnson-B photometric observation of HD 137949. These high-speed photometric data were acquired between June 12 and August 19 2013 using the 0.5-m telescope of the South African Astronomical Observatory (SAAO). The result of our frequency analysis when compared with that of similar B-light photometric data obtained in 1981 and 1987 using the same telescope reveals the existence of a long-term stability in its principal frequency of oscillation at mHz; even with the excitation of two new secondary oscillations ( mHz; mHz). On the contrary, the signature of its principal amplitude of oscillation () was found to have changed drastically within a time-span of about three decades. However, the aggregate amplitude () of all the detected oscillations was observed to have remained constant within the period under investigation. In addition, HD 137949 was observed to have undergone pulsational energy re-distribution within this time-span of about three decades; with a signature that is suggestive of non-conservation of its total energy (pulsational). We discuss the possible implications of the recently observed dynamics in the oscillation-signature of HD 137949.
期刊介绍:
New Astronomy publishes articles in all fields of astronomy and astrophysics, with a particular focus on computational astronomy: mathematical and astronomy techniques and methodology, simulations, modelling and numerical results and computational techniques in instrumentation.
New Astronomy includes full length research articles and review articles. The journal covers solar, stellar, galactic and extragalactic astronomy and astrophysics. It reports on original research in all wavelength bands, ranging from radio to gamma-ray.