Publications of the Astronomical Society of Japan最新文献_第10页

The additional pressure of white dwarf stars generated by net charges 白矮星由净电荷产生的额外压力

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-08-09 DOI: 10.1093/pasj/psad047

Ting-Han Pei

引用次数: 0

Plasma diagnostics and Alfvén wave heating of solar prominences by multiwavelength observations 多波长观测的等离子体诊断和太阳日珥的alfvsamn波加热

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-07-27 DOI: 10.1093/pasj/psad049

Yuki Hashimoto, K. Ichimoto, Yuwei Huang

{"title":"Plasma diagnostics and Alfvén wave heating of solar prominences by multiwavelength observations","authors":"Yuki Hashimoto, K. Ichimoto, Yuwei Huang","doi":"10.1093/pasj/psad049","DOIUrl":"https://doi.org/10.1093/pasj/psad049","url":null,"abstract":"\u0000 Solar prominences are cool and dense plasma supported by the magnetic field in the solar corona. They are composed of fine-scale structures called threads. Prominences are heated by the incident radiation from the solar atmosphere, but previous studies have shown that additional heating is necessary to maintain the temperature of prominences of about 104 K. This study aims to investigate quantitatively the mechanical heating of the prominences from observations. We performed spectroscopic observations of prominences in Hα (6563 Å), Hβ (4861 Å), and Ca ii IR (8542 Å) with the Domeless Solar Telescope at Hida observatory. The plasma parameters of the prominences are estimated by fittings of line profiles using the single-slab model and by solving the statistical equilibrium equation. By assuming that the turbulent motion is the manifestation of propagating Alfvén waves, net radiative losses and Alfvén wave energy flux in the prominences are estimated from these parameters. As a result, it was found that the energy flux by Alfvén waves is sufficient to compensate for the net radiative losses in most regions of the central part of the prominences. On the other hand, Alfvén wave energy flux tends to be insufficient at the outer part of prominences. In such regions, another heating mechanism such as enthalpy flux of mixing with coronal plasma needs to be considered.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74053385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retraction of: Transient jet ejections associated with limit-cycle behaviors in the very high state of black hole binaries 缩回:与黑洞双星极高状态极限环行为相关的瞬态喷射

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-07-26 DOI: 10.1093/pasj/psad045

引用次数: 0

Suzaku spectral analysis of an X-ray emitting plasma in the supernova remnant G352.7−0.1 超新星遗迹G352.7−0.1中x射线等离子体的Suzaku光谱分析

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-07-25 DOI: 10.1093/pasj/psad048

Asahi Fujishige, S. Yamauchi, K. Nobukawa, M. Nobukawa

引用次数: 0

A 3 mm molecular line survey toward the C-star envelope CIT 6 对c星包膜CIT 6的3毫米分子线测量

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-07-18 DOI: 10.1093/pasj/psad043

Kuilu Yang, Yong Zhang, J. Qiu, Yina Ao, Xiaohu Li

{"title":"A 3 mm molecular line survey toward the C-star envelope CIT 6","authors":"Kuilu Yang, Yong Zhang, J. Qiu, Yina Ao, Xiaohu Li","doi":"10.1093/pasj/psad043","DOIUrl":"https://doi.org/10.1093/pasj/psad043","url":null,"abstract":"\u0000 We present an unbiased molecular line survey toward the carbon-rich circumstellar envelope CIT 6 carried out between 90 and 116 GHz with the Arizona Radio Observatory 12 m telescope. A total of 42 lines assigned to 10 molecular species and four isotopologues are detected. Despite the absence of any newly identified circumstellar molecules, several transitions are freshly reported for this object. This work is a complement to our previous line survey toward CIT 6 in the frequency ranges of 36–49 GHz and 131–268 GHz. Based on the measurements and in combination with previously published data, we perform a rotation-diagram analysis to determine the column densities, excitation temperatures, and fractional abundances of the molecules. The excitation temperature varies along the radius. The abundance pattern of CIT 6 is broadly consistent with that of the prototype C-star IRC +10216 at the specified detection sensitivity, indicating that the molecular richness in IRC +10216 cannot be attributed to an interpretation of unusual chemistry. Nevertheless, subtle distinctions between the two C-stars are found. The higher abundance of carbon-chain molecules and lower 12C$/$13C ratio in CIT 6 compared to IRC +10216 imply that the former is more massive or in a more evolved phase than the latter.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90903460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Data processing pipeline for multiple-exposure photo-plate digital archives 多曝光照片底片数字档案的数据处理流水线

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-06-28 DOI: 10.1093/pasj/psad038

P. Jia, Zhimin Yang, Z. Shang, Yong Yu, Jianhai Zhao

{"title":"Data processing pipeline for multiple-exposure photo-plate digital archives","authors":"P. Jia, Zhimin Yang, Z. Shang, Yong Yu, Jianhai Zhao","doi":"10.1093/pasj/psad038","DOIUrl":"https://doi.org/10.1093/pasj/psad038","url":null,"abstract":"\u0000 Photo-plates are an invaluable historical legacy that have been used for over a hundred years to capture images of celestial objects. By digitizing these photo-plates and processing the images with digital image processing methods, scientists can study celestial objects that exhibit temporal variations. Multiple-exposure photo-plates are a unique type of observation data that can capture images of the same sky at different observation times in a single photo-plate. Such photo-plates can be used to discover flares or moving targets with rapid variations, but they are difficult to process automatically due to their complex observation strategies. This paper proposes a pipeline based on classical data-processing algorithms and machine-learning algorithms to detect flares or moving targets in multiple-exposure photo-plate images automatically. The pipeline was used to process several digitized multiple-exposure photo-plate images from the China Astronomical Plates Data, and preliminary results indicate that the pipeline is effective. In the future, we plan to use our method to discover more celestial objects with temporal variations from photo-plate digital archives.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78853412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cosmic-ray-driven enhancement of the C0/CO abundance ratio in W 51 C 宇宙射线驱动下w51 C中C0/CO丰度比的增强

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-06-28 DOI: 10.1093/pasj/psad046

M. Yamagishi, K. Furuya, H. Sano, Natsuko Izumi, T. Takekoshi, H. Kaneda, K. Nakanishi, T. Shimonishi

{"title":"Cosmic-ray-driven enhancement of the C0/CO abundance ratio in W 51 C","authors":"M. Yamagishi, K. Furuya, H. Sano, Natsuko Izumi, T. Takekoshi, H. Kaneda, K. Nakanishi, T. Shimonishi","doi":"10.1093/pasj/psad046","DOIUrl":"https://doi.org/10.1093/pasj/psad046","url":null,"abstract":"\u0000 We examine spatial variations of the C0$/$CO abundance ratio (XC/CO) in the vicinity of the γ-ray supernova remnant W 51 C, based on [C i] (3P1–3P0), 12CO(1–0), and 13CO(1–0) observations with the ASTE and Nobeyama 45 m telescopes. We find that XC/CO varies in a range of 0.02–0.16 (0.05 in median) inside the molecular clouds of AV > 100 mag, where photodissociation of CO by the interstellar UV is negligible. Furthermore, XC/CO is locally enhanced by a factor of up to four near the W 51 C center, depending on the projected distance from the W 51 C center. In high-AV molecular clouds, XC/CO is determined by the ratio of the cosmic-ray (CR) ionization rate to the H2 density, and we find no clear spatial variation of the H2 density against the projected distance. Hence, the high CR ionization rate may locally enhance XC/CO near the W 51 C center. We also find that the observed spatial extent of the enhanced XC/CO (∼17 pc) is consistent with the diffusion distance of CRs with an energy of 100 MeV. This fact suggests that the low-energy CRs accelerated in W 51 C enhance XC/CO. The CR ionization rate in the XC/CO-enhanced cloud is estimated to be 3 × 10−16 s−1 on the basis of time-dependent photodissociation region simulations of XC/CO, the value of which is 30 times higher than that in the standard Galactic environment. These results demonstrate that [C i] is a powerful probe to investigate the interaction between CRs and the interstellar medium for a wide area in the vicinity of supernova remnants.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87128191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Magnetic configurations related to the coronal heating and solar wind generation. II. Quantitative characterization of active-region magnetic structure based on the geometric property of force-free α 与日冕加热和太阳风产生有关的磁场结构。2基于无力α几何性质的有源区磁性结构定量表征

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-06-13 DOI: 10.1093/pasj/psad035

Yeonwoo Jang, Sibaek Yi, T. Magara

{"title":"Magnetic configurations related to the coronal heating and solar wind generation. II. Quantitative characterization of active-region magnetic structure based on the geometric property of force-free α","authors":"Yeonwoo Jang, Sibaek Yi, T. Magara","doi":"10.1093/pasj/psad035","DOIUrl":"https://doi.org/10.1093/pasj/psad035","url":null,"abstract":"\u0000 We investigate the geometric property of a scalar position function, the so-called force-free α, to see how it quantitatively characterizes the magnetic structure of solar active regions, which is reminiscent of the electrostatic potential whose geometric property provides information on the structure of electrified objects. Scatter plots of (α, ∇2α) show characteristic shapes representing twisted magnetic field configurations in two model active regions, one of which is formed by an emerging magnetic flux tube composed of strongly twisted field lines while the other is formed by a weakly twisted flux tube. By generalizing the concept of an axis field line in a uniformly twisted cylindrical flux tube, we introduce a topological object called the principal field line to represent magnetic structure reconstructed using a force-free field model. The principal field line and associated scatter plot of (α, ∇2α) provide a method reminiscent of active-region radiography, which could be used for quantitative classification of active regions with those magnetic configurations responsible for heating coronal plasmas, generating solar winds, and producing potentially harmful coronal explosive phenomena.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83536132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detection of six massive contact binaries with tertiary component candidates in the Small Magellanic Cloud 小麦哲伦星云中六个具有候选三级成分的大质量接触双星的探测

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-06-07 DOI: 10.1093/pasj/psad037

Chu-Qi Wu, S. Qian, Fu-Xing Li, Li-ying Zhu, E. Zhao, W. Liao

{"title":"Detection of six massive contact binaries with tertiary component candidates in the Small Magellanic Cloud","authors":"Chu-Qi Wu, S. Qian, Fu-Xing Li, Li-ying Zhu, E. Zhao, W. Liao","doi":"10.1093/pasj/psad037","DOIUrl":"https://doi.org/10.1093/pasj/psad037","url":null,"abstract":"\u0000 To study massive binaries in different evolution stages or environments, we use the Small Magellanic Cloud (SMC) as our target because the metallicity in the SMC is much lower than that in our Milky Way. The period change of early-type close binary systems in the SMC was studied based on OGLE collections. Six of these systems are found to have periodic period changes. Since all of them are of early type, the light-traveltime effect probably created by these massive binaries with third bodies is used to explain such a phenomenon. We use the Wilson–Devinney code (WD method) to analyze their I-band photometric light curves. The results show the six third bodies as having orbital periods from 6.41–24.65 yr and minimum masses from 0.31–4.11 M⊙. Among all six systems, three have a negative $dot{P}$, which means that their periods keep decreasing. In addition, from the WD result, we find there are three deep-contact binaries, one intermediate-contact binary, and two shallow-contact binaries. The fraction of companions in massive contact binaries is quite high based on this sample, which may demonstrate the notion of high multiplicity in massive binary stars. This might mean that additional components may play an important role in the evolution of massive close binaries.","PeriodicalId":20733,"journal":{"name":"Publications of the Astronomical Society of Japan","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82875234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nobeyama 45 m CO J = 1–0 observations of luminous type 1 AGNs at z ≈ 0.3 Nobeyama 45 m CO J = 1 - 0在z≈0.3处发光型AGNs的观测

IF 2.3 4区物理与天体物理

Publications of the Astronomical Society of Japan Pub Date : 2023-06-01 DOI: 10.1093/pasj/psad039

T. Michiyama, Ming-Yang Zhuang, J. Shangguan, Hassen M. Yesuf, H. Kaneko, L. Ho

引用次数: 0