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Issue Information: Astron. Nachr. 07/2024 发行信息:Astron.Nachr.07/2024
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-10-15 DOI: 10.1002/asna.20249007
{"title":"Issue Information: Astron. Nachr. 07/2024","authors":"","doi":"10.1002/asna.20249007","DOIUrl":"https://doi.org/10.1002/asna.20249007","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.20249007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cover Picture: Astron. Nachr. 8/2024 封面图片:Astron.Nachr.8/2024
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-10-15 DOI: 10.1002/asna.20249016
Hikmet Çakmak, Talar Yontan, Selçuk Bilir, Timothy S. Banks, Raúl Michel, Esin Soydugan, Seliz Koç, Hülya Erçay
{"title":"Cover Picture: Astron. Nachr. 8/2024","authors":"Hikmet Çakmak,&nbsp;Talar Yontan,&nbsp;Selçuk Bilir,&nbsp;Timothy S. Banks,&nbsp;Raúl Michel,&nbsp;Esin Soydugan,&nbsp;Seliz Koç,&nbsp;Hülya Erçay","doi":"10.1002/asna.20249016","DOIUrl":"https://doi.org/10.1002/asna.20249016","url":null,"abstract":"<p>Vector-Point Diagrams (left panels) and proper-motion component vectors (right panels) for identified member stars in the open clusters Ruprecht 1 and Ruprecht 171. These two previously little-studied open clusters, both at a distance of approximately 1.5 kpc, have been characterized and studied in some detail in the related paper by Çakmak and collaborators, published in this issue e240054.\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.20249016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
HX Velorum: Ellipsoidal/Rotational Binary With β Cep Type Component HX Velorum带有 β Cep 型成分的椭球/旋转双星
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-10-08 DOI: 10.1002/asna.20240028
B. Gürol
{"title":"HX Velorum: Ellipsoidal/Rotational Binary With β Cep Type Component","authors":"B. Gürol","doi":"10.1002/asna.20240028","DOIUrl":"https://doi.org/10.1002/asna.20240028","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;We present the Transiting Exoplanet Survey Satellite (TESS) light curve analysis of HX Velorum, located in the Southern Hemisphere, where one of the components is found for the first time to be a &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;β&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ beta $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; Cep (BCEP) type pulsator. The TESS observations of HX Velorum were published in a total of 6 sectors. Fourier analysis of the observations reveals that the frequencies can be divided into two categories, one of which is related to the orbital period and the other related to the &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;β&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ beta $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; Cep-type pulsation. Its non-eclipsing light curve was analyzed with the well-known Wilson–Devinney code, and we obtained the geometric and physical parameters of the components using published radial velocity and light curve data by making some assumptions. We obtained plausible masses and radii of the primary and secondary components as &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;9.48&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;0.27&lt;/mn&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;mo&gt;⊙&lt;/mo&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {M}_1=9.48pm 0.27{M}_{odot } $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;5.92&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;0.17&lt;/mn&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;M&lt;/mi&gt;\u0000 &lt;mo&gt;⊙&lt;/mo&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {M}_2=5.92pm 0.17{M}_{odot } $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;mn&gt;1&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;3.93&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;0.04&lt;/mn&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;R&lt;/mi&gt;\u0000 &lt;mo&gt;⊙&lt;/mo&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {R}_1=3.93pm 0.04{R}_{odot } $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 ","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443557","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
Red Quasars: Estimation of SMBH Spin, Mass, and Accretion Disk Inclination Angle 红色类星体估计SMBH自旋、质量和吸积盘倾角
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-10-06 DOI: 10.1002/asna.20240058
M. Yu. Piotrovich, S. D. Buliga, T. M. Natsvlishvili
{"title":"Red Quasars: Estimation of SMBH Spin, Mass, and Accretion Disk Inclination Angle","authors":"M. Yu. Piotrovich,&nbsp;S. D. Buliga,&nbsp;T. M. Natsvlishvili","doi":"10.1002/asna.20240058","DOIUrl":"https://doi.org/10.1002/asna.20240058","url":null,"abstract":"<div>\u0000 \u0000 <p>We estimated values of spin, mass, and inclination angle for sample of 42 red quasars. Our estimations show that two objects: F2MS J1113+1244 and F2MS J1434+0935 with the highest Eddington ratios may have geometrically thick disk. Six objects: SDSS J0036-0113, S82X 0040+0058, S82X 0118+0018, S82X 0303-0115, FBQS J1227+3214, S82X 2328-0028 may have “retrograde” rotation. Analysis of estimated spin values shows that red quasar population may contain Seyfert galaxies and NLS1.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443411","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
Photometric and Kinematic Studies of Open Clusters Ruprecht 1 and Ruprecht 171 开放星团 Ruprecht 1 和 Ruprecht 171 的光度和运动学研究
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-10-03 DOI: 10.1002/asna.20240054
Hikmet Çakmak, Talar Yontan, Selçuk Bilir, Timothy S. Banks, Raúl Michel, Esin Soydugan, Seliz Koç, Hülya Erçay
{"title":"Photometric and Kinematic Studies of Open Clusters Ruprecht 1 and Ruprecht 171","authors":"Hikmet Çakmak,&nbsp;Talar Yontan,&nbsp;Selçuk Bilir,&nbsp;Timothy S. Banks,&nbsp;Raúl Michel,&nbsp;Esin Soydugan,&nbsp;Seliz Koç,&nbsp;Hülya Erçay","doi":"10.1002/asna.20240054","DOIUrl":"https://doi.org/10.1002/asna.20240054","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;This study outlines a detailed investigation using CCD &lt;i&gt;UBV&lt;/i&gt; and &lt;i&gt;Gaia&lt;/i&gt; DR3 data sets of the two open clusters Ruprecht 1 (Rup-1) and Ruprecht 171 (Rup-171). Fundamental astrophysical parameters such as color excesses, photometric metallicities, ages, and isochrone distances were based on &lt;i&gt;UBV&lt;/i&gt;-data analyses, whereas membership probability calculations, structural and astrophysical parameters, as well as the kinematic analyses were based on &lt;i&gt;Gaia&lt;/i&gt; DR3-data. We identified 74 and 596 stars as the most probable cluster members with membership probabilities over 50% for Rup-1 and Rup-171, respectively. The color excesses &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;(&lt;/mo&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;B&lt;/mi&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mi&gt;V&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;)&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ Eleft(B-Vright) $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; were obtained as &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.166&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;0.022&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ 0.166pm 0.022 $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.301&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;0.027&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ 0.301pm 0.027 $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; mag for Rup-1 and Rup-171, respectively. Photometric metallicity analyses were performed by considering F-G type main-sequence member stars and found to be &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;[&lt;/mo&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Fe&lt;/mi&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;H&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;]&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;0.09&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 &lt;mn&gt;0.16&lt;/mn&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ left[mathrm{Fe}/mathrm{H}right]=-0.09pm 0.16 $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mo&gt;[&lt;/mo&gt;\u0000 &lt;mrow&gt;\u0000 &lt;mi&gt;Fe&lt;/mi&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;H&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;]&lt;/mo&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;0.20&lt;/mn&gt;\u0000 &lt;mo&gt;±&lt;/mo&gt;\u0000 ","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443404","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
Cover Picture: Astron. Nachr. 7/2024 封面图片:Astron.Nachr.7/2024
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-08-20 DOI: 10.1002/asna.20249015
Klaus G. Strassmeier, Ilya Ilyin, Manfred Woche, Frank Dionies, Michael Weber, Arto Järvinen, Carsten Denker, Ekaterina Dineva, Meetu Verma, Thomas Granzer, Wilbert Bittner, Svend-Marian Bauer, Jens Paschke, Hakan Önel
{"title":"Cover Picture: Astron. Nachr. 7/2024","authors":"Klaus G. Strassmeier,&nbsp;Ilya Ilyin,&nbsp;Manfred Woche,&nbsp;Frank Dionies,&nbsp;Michael Weber,&nbsp;Arto Järvinen,&nbsp;Carsten Denker,&nbsp;Ekaterina Dineva,&nbsp;Meetu Verma,&nbsp;Thomas Granzer,&nbsp;Wilbert Bittner,&nbsp;Svend-Marian Bauer,&nbsp;Jens Paschke,&nbsp;Hakan Önel","doi":"10.1002/asna.20249015","DOIUrl":"https://doi.org/10.1002/asna.20249015","url":null,"abstract":"<p>First-light spectra of the Sun as a star taken by SDI-POL, the Solar Disk Integration POLarimeter feeding the PEPSI night-time spectrograph at the LBT. The <i>top panel</i> shows the full wavelength range (383 - 907 nm) covered by SDI-POL. The color of the Stokes <i>I</i> spectra indicates the individual cross dispersers; dark blue (=CD 1) to dark red (=CD 6). The line at the bottom represents the normalized Stokes <i>V Q &amp; U</i> signal on the same intensity scale as Stokes <i>I</i>. The <i>bottom panel</i> is a zoom into the spectral region around the sodium D lines. The top spectrum is again Stokes <i>I</i> (plotted are dots per CCD pixel connected by a line), the bottom spectra are Stokes <i>V Q U</i> shifted by -0.10 in intensity and expanded by a factor 200 in scale with respect to Stokes <i>I</i>. The <i>I Q U</i> spectrum was taken on UT May 20, 2022, the <i>V</i>-spectrum on UT June 22, 2023. The first-light application detects a clear Stokes <i>V/I</i> profile indicative of a tiny but significant solar disk-averaged line-of-sight net magnetic field of +0.37±0.02 Gauß on Oct. 13, 2023, as reported in the article by Strassmeier <i>et al</i>., this issue, e240033.\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 6-7","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.20249015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142021732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Issue Information: Astron. Nachr. 07/2024 发行信息:Astron.Nachr.07/2024
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-08-20 DOI: 10.1002/asna.20249006
{"title":"Issue Information: Astron. Nachr. 07/2024","authors":"","doi":"10.1002/asna.20249006","DOIUrl":"https://doi.org/10.1002/asna.20249006","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 6-7","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.20249006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142021722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
What is the unknown “star” or “∼star” recorded in Korean historical books? 韩国史书中记载的不知名的 "星 "或"∼星 "是什么?
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-08-06 DOI: 10.1002/asna.20240068
Jaegeun Park, Junhyeok Jeon, Hongjun An
{"title":"What is the unknown “star” or “∼star” recorded in Korean historical books?","authors":"Jaegeun Park,&nbsp;Junhyeok Jeon,&nbsp;Hongjun An","doi":"10.1002/asna.20240068","DOIUrl":"10.1002/asna.20240068","url":null,"abstract":"<p>This study discusses historical records of Korea that mention “stars” possibly related to astronomical transient events. We selected 19 such records and scrutinized them by cross-checking with records of other countries to identify those events. Ten events were identified as comets based on their described motions and tails. We further confirmed this by comparing them with records from other countries. Five events were classified as meteors based on descriptions of their movements, sizes, and shapes. We speculate that two recordings about “big stars” (大星) are typographical errors for “Mars” (火星), as the descriptions of these big stars seem to be consistent with the properties of the latter. This leaves two unidentified events, and we search lists of astronomical transients for their counterparts. Our work emphasizes the uncertainties and challenges caused by the limited information in the historical records while exploring the usefulness of historical records to enhance the understanding of astrophysical transient events.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946843","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
Toward an efficient second-order method for computing the surface gravitational potential on spherical-polar meshes 在球极网格上计算表面引力势的高效二阶方法
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-08-06 DOI: 10.1002/asna.20240056
Oliver Gressel, Udo Ziegler
{"title":"Toward an efficient second-order method for computing the surface gravitational potential on spherical-polar meshes","authors":"Oliver Gressel,&nbsp;Udo Ziegler","doi":"10.1002/asna.20240056","DOIUrl":"10.1002/asna.20240056","url":null,"abstract":"<p>Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self-gravity. In the context of circumstellar discs, this can, for instance, cause fragmentation of the disc gas, and—under suitable conditions—lead to the direct formation of gas-giant planets. If one wants to study these phenomena, the disc's gravitational potential needs to be obtained by solving the Poisson equation. This requires to specify suitable boundary conditions. In the case of a spherical-polar computational mesh, a standard multipole expansion for obtaining boundary values is not practicable. We hence compare two alternative methods for overcoming this limitation. The first method is based on a known Green's function expansion (termed “CCGF”) of the potential, while the second (termed “James' method”) uses a surface screening mass approach with a suitable discrete Green's function. We demonstrate second-order convergence for both methods and test the weak scaling behavior when using thousands of computational cores. Overall, James' method is found superior owing to its favorable algorithmic complexity of <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mi>O</mi>\u0000 <mfenced>\u0000 <msup>\u0000 <mi>n</mi>\u0000 <mn>3</mn>\u0000 </msup>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation>$$ sim mathcal{O}left({n}^3right) $$</annotation>\u0000 </semantics></math> compared with the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mi>O</mi>\u0000 <mfenced>\u0000 <msup>\u0000 <mi>n</mi>\u0000 <mn>4</mn>\u0000 </msup>\u0000 </mfenced>\u0000 </mrow>\u0000 <annotation>$$ sim mathcal{O}left({n}^4right) $$</annotation>\u0000 </semantics></math> scaling of the CCGF method.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"345 8","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.20240056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141946842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Does the Nebra Sky Disk encode an early Bronze Age report of a galactic supernova? 尼布拉天盘是否编码了青铜时代早期关于银河系超新星的报告?
IF 1.1 4区 物理与天体物理
Astronomische Nachrichten Pub Date : 2024-08-01 DOI: 10.1002/asna.20240042
Nikolaus Vogt, Juan Crocco
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