Astronomische Nachrichten最新文献

{"title":"Cover Picture: Astron. Nachr. 3/2025","authors":"J. E. Horvath","doi":"10.1002/asna.70013","DOIUrl":"https://doi.org/10.1002/asna.70013","url":null,"abstract":"<p>The wide variety of topics discussed at the IWARA 2014 workshop in Machu Picchu, Peru, and their relation to a large range of disciplines from archaeology to cosmology is illustrated schematically in this artwork. Names point out authors among the IWARA participants who wrote scientific contributions in the respective field of research. The chart may be taken as a guide to explore the publications in this Special Issue of AN. Some interesting philosophical comments about the science discussed (and not discussed) at the workshop can be found in the Concluding Remarks by J.E. Horvath (e240137).\u0000\u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 3-4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206590","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}

{"title":"Issue Information: Astron. Nachr. 3/2025","authors":"","doi":"10.1002/asna.70012","DOIUrl":"https://doi.org/10.1002/asna.70012","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 3-4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206733","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}

{"title":"MOND and Isolated Elliptical Galaxies—NGC 6411","authors":"Tom Richtler,&nbsp;Juan-Pablo Caso,&nbsp;Lilia P. Bassino,&nbsp;Michael Hilker,&nbsp;Neil Nagar","doi":"10.1002/asna.70011","DOIUrl":"https://doi.org/10.1002/asna.70011","url":null,"abstract":"<div>\u0000 \u0000 <p>NGC 6411, an isolated elliptical galaxy, appears in the literature with an intermediate age of 3.5 Gyr. Its globular cluster system (GCS), on the other hand, has all the properties of a very old age. The knowledge of the stellar <i>M</i>/<i>L</i> ratio is necessary to evaluate its mass discrepancy. NGC 6411 has a low central surface brightness, which makes it a valuable test object for Modified Newtonian Dynamics (MOND). We reconsider the conflict between age and GCS properties. We perform a stellar population analysis to constrain its baryonic mass and do a kinematical analysis to constrain the total mass. We use data cubes from the CALIFA (Calar Alto Legacy Integral Field Area) survey to investigate the stellar population and measure velocity dispersions of NGC 6411, employing the spectral synthesis codes Starlight and ppxf. The dynamical analysis is based on spherical Jeans models. Using Starlight, an intermediate age of NGC 6411 results only as a Single Stellar Population (SSP) age with a fixed reddening. This seems to be caused by a slightly erroneous continuum slope. ppxf, which does not fit the continuum, gives an SSP age of 12 Gyr. A simple isotropic MOND model reproduces the projected velocity dispersions well. NGC 6411 joins the list of early-type galaxies for which MOND makes a successful prediction. It is special in the sense that due to its low surface brightness, MOND effects become visible at smaller radii than in other elliptical galaxies.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843575","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}

{"title":"Structure of Quark Stars in f(R) Gravity","authors":"Takashi Katayama,&nbsp;Fridolin Weber","doi":"10.1002/asna.70010","DOIUrl":"https://doi.org/10.1002/asna.70010","url":null,"abstract":"<div>\u0000 \u0000 <p>We explore <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>R</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$$ f(R) $$</annotation>\u0000 </semantics></math> gravity, a classical extension of general relativity, and evaluate its applicability to compact stars. As a modification of Einstein's theory, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>R</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$$ f(R) $$</annotation>\u0000 </semantics></math> gravity serves as a useful framework for investigating gravitational effects in ultra-relativistic regimes where (standard) general relativity may break down, while remaining consistent with it in weak-field limits. In this work, we derive a second-order modified Tolman–Oppenheimer–Volkoff (MTOV) system, consisting of four coupled second-order differential equations, for general <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>R</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$$ f(R) $$</annotation>\u0000 </semantics></math> gravity. This formulation is applied to static, spherically symmetric strange quark stars modeled using the MIT Bag equation of state. We propose two <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>R</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$$ f(R) $$</annotation>\u0000 </semantics></math> models, each incorporating a single parameter that governs the deviation from general relativity. The MTOV equations are solved numerically using the Runge–Kutta-Fehlberg method, and the results are compared to those obtained in general relativity. Our findings demonstrate that <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>f</mi>\u0000 <mrow>\u0000 <mo>(</mo>\u0000 <mi>R</mi>\u0000 <mo>)</mo>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation>$$ f(R) $$</annotation>\u0000 </semantics></math> gravity can yield distinct and physically meaningful modifications to the properties of compact stars. We further examine the contributions of second- and higher-order corrections in the scalar-tensor sector of the gravitational action.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135702","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}

{"title":"Can We Draw Conclusions on Supernova Shock Wave Propagation Using Short-Lived Radioactive Isotopes?","authors":"Benjamin Wehmeyer,&nbsp;Andrés Yagüe López,&nbsp;Benoit Côté,&nbsp;Maria K. Petö,&nbsp;Chiaki Kobayashi,&nbsp;Maria Lugaro","doi":"10.1002/asna.70002","DOIUrl":"https://doi.org/10.1002/asna.70002","url":null,"abstract":"<p>We run a three-dimensional Galactic chemical evolution (GCE) model to follow the propagation of ⁵³Mn (exclusively produced from type Ia supernovae, SNIa), ⁶⁰Fe (exclusively produced from core-collapse supernovae, CCSNe), ¹⁸²Hf (exclusively produced from intermediate mass stars, IMSs), and ²⁴⁴Pu (exclusively produced from neutron star mergers, NSMs). By comparing the predictions from our three-dimensional GCE model to recent detections of ⁵³Mn, ⁶⁰Fe, and ²⁴⁴Pu on the deep-sea floor, we draw conclusions about their propagation in the interstellar medium.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 3-4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206991","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}

{"title":"On the Age Distribution of Classical Cepheids in the Galaxy","authors":"Friedrich Anders,&nbsp;Chloé Padois,&nbsp;Marc Vilanova Sar,&nbsp;Marcin Semczuk,&nbsp;Marc del Alcázar-Julià,&nbsp;Francesca Figueras","doi":"10.1002/asna.70009","DOIUrl":"https://doi.org/10.1002/asna.70009","url":null,"abstract":"<p>We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter-intuitive in the context of inside-out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with stellar evolutionary models. We then select Classical Cepheids from this simulation and test in qualitative terms which ingredients are necessary to find agreement with the observational data. We show that the interplay of the Galactic disc's metallicity gradient and the metallicity dependence of the Cepheids' life-time in the instability strip results in a pronounced positive age-Galactocentric distance relation. This renders a reconstruction of the recent star-formation history based on Classical Cepheids unrealistic. It also has important consequences on our interpretation of the observed scatter about the radial metallicity gradient measured with Galactic Classical Cepheids.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 5","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482016","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}

{"title":"Stochastic Quantum Mechanics in Curved Spaces: Application to Schwarzschild Black Holes","authors":"Juan S. Jerez-Rodriguez,&nbsp;Tonatiuh Matos","doi":"10.1002/asna.70007","DOIUrl":"https://doi.org/10.1002/asna.70007","url":null,"abstract":"<p>In this work, we start from the hypothesis that the universe lives in a Gravitational Wave Background (GWB). From this hypothesis, it follows that space–time is not locally flat because we have to take into account the fluctuations of the GWB in space–time. This implies that sufficiently small particles will feel these oscillations, preventing them from following geodesic trajectories. Thus, in a previous work, it was shown that if these particles follow the geodesic trajectories plus a stochastic term due to space–time fluctuations, the field equation for these quantum particles is simply the Klein–Gordon equation in this arbitrary curved space–time. In this work, we analyze these geodesics plus the stochastic trajectories in a Schwarzschild black hole.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 3-4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206801","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}

{"title":"Archaeoastronomy and Cognition: La Mink'a and La Mit'a From the Logic of Relations's Perspective","authors":"Mônica Estrázulas","doi":"10.1002/asna.70001","DOIUrl":"https://doi.org/10.1002/asna.70001","url":null,"abstract":"<div>\u0000 \u0000 <p>To understand the contributions of ancient civilizations to the evolution of knowledge in the fields of archaeoastronomy and/or science in general, through a cognitive perspective, we seek to identify conceptual elements that are consonant and converge with science. All of them come from a cognitive processes in which the subject and the object of knowledge collaborate in a progressive constitution, according to Genetic Epistemology. It is necessary to identify the presence of logic as a mental structure that allows the subject to be capable of supporting the scientific work. In this article, we analyze dates that come from the inca's concept of Ayni which permeates the activities La Mint'a and La Mink'a and demonstrates the presence of the same cognitive structure—the logical—required by scientific work.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 3-4","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144206826","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}

{"title":"Gaia Search for Stellar Companions of TESS Objects of Interest V","authors":"Markus Mugrauer,&nbsp;Ann-Kathrin Kollak,&nbsp;Lara Pietsch,&nbsp;Kai-Uwe Michel","doi":"10.1002/asna.70005","DOIUrl":"https://doi.org/10.1002/asna.70005","url":null,"abstract":"<p>In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties. A total of 92 binary and two hierarchical triple star systems are identified among the 745 target stars whose multiplicity is explored in this study, all at distances of less than 500 pc around the Sun. As expected for components of gravitationally bound star systems, the targets and the detected companions are at the same distance and share a common proper motion, as shown by their accurate Gaia astrometry. The companions have masses of about 0.12 to 1.6 <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mo>⊙</mo>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {M}_{odot } $$</annotation>\u0000 </semantics></math> and are most frequently found in the mass range up to 0.6 <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>M</mi>\u0000 <mo>⊙</mo>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {M}_{odot } $$</annotation>\u0000 </semantics></math>. The companions have projected separations from the targets between about 110 and 9600 au. Their frequency is highest and constant from about 300 to 800 au, decreasing at larger projected separations. In addition to main sequence stars, five white dwarf companions are detected in this study, whose true nature is unveiled by their photometric properties.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 5","pages":""},"PeriodicalIF":1.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144482090","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}

{"title":"Compressibility Function and Speed of Sound in the Non-Commutative Quantum Hadrodynamics Type-I Model for Neutron Stars","authors":"João Gabriel Galli Gimenez,&nbsp;Dimiter Hadjimichef,&nbsp;César A. Zen Vasconcellos","doi":"10.1002/asna.70008","DOIUrl":"https://doi.org/10.1002/asna.70008","url":null,"abstract":"<p>We investigate the effects of a minimal measurable length on neutron stars, within the quantum hadrodynamics (QHD-I) model modified by the Generalized Uncertainty Principle (GUP). Working in a deformed Poisson algebra framework, we incorporate GUP effects via a time-invariant transformation of the phase space volume, effectively reducing the number of accessible quantum states at high momentum. We focus specifically on two observables critical to this star physics, the compressibility, which encapsulates how stiff EOS become, and the speed of sound, which imposes a causality constraint. Using this model as an exploratory study, due to its simplicity and structured description, we perform a preliminary analysis of GUP effects with a minimum spacetime length on these compact objects. This deformation increases the speed of sound while decreasing the compressibility, and we identify critical values of the Fermi momentum beyond which both quantities become nonphysical. These results underscore the potential role of a minimal length scale in shaping the bulk properties and possible phase structures of dense matter in neutron stars.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"346 7-8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145135193","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}