Astronomische Nachrichten最新文献

{"title":"Validation and Spin of the Bright Part of Gaia DR2 and DR3","authors":"G. Damljanović, F. Taris","doi":"10.1002/asna.70120","DOIUrl":"https://doi.org/10.1002/asna.70120","url":null,"abstract":"<div>\u0000 \u0000 <p>The Gaia Data Release 3 (DR3) is an important step in the realization of the future Gaia reference frame. Ideally, across G magnitudes from 3 to 21, the Gaia DR2 and DR3 objects with their positions (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>α</mi>\u0000 </mrow>\u0000 <annotation>$$ alpha $$</annotation>\u0000 </semantics></math>, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>δ</mi>\u0000 </mrow>\u0000 <annotation>$$ delta $$</annotation>\u0000 </semantics></math>) and proper motions (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>μ</mi>\u0000 <mi>α</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {mu}_{alpha } $$</annotation>\u0000 </semantics></math>, <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>μ</mi>\u0000 <mi>δ</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {mu}_{delta } $$</annotation>\u0000 </semantics></math>) should be expressed in a nonrotating reference frame relative to distant extragalactic sources (mostly quasars—QSOs) and in accordance with the International Celestial Reference System (ICRS). There are comparison data for <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>G</mi>\u0000 <mo>></mo>\u0000 <mn>16</mn>\u0000 </mrow>\u0000 <annotation>$$ G>16 $$</annotation>\u0000 </semantics></math> mag objects using Gaia's observations of QSOs, but it is not possible for brighter objects. The QSOs are faint objects in optical domain (just small amount of QSOs for mag) and the validation of the bright part of Gaia reference frame is difficult. We did it and investigated a spin <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>ω</mi>\u0000 </mrow>\u0000 <annotation>$$ omega $$</annotation>\u0000 </semantics></math> of the indicated rotation of the Gaia bright star reference frame. It is <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>ω</mi>\u0000 <mi>Z</mi>\u0000 </msub>\u0000 <mo>≈</mo>\u0000 <mn>0</mn>\u0000 </mrow>\u0000 <annotation>$$ {omega}_Zapprox 0 $$</annotation>\u0000 </semantics></math> mas year<sup>−1</sup> from the other papers. We determined two spin components (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>ω</mi>\u0000 <mi>X</mi>\u0000 </msub>\u0000 </mrow>\u0000 <annotation>$$ {omega}_X $$</annotation>\u0000 ","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823208","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":"Revisiting Variable Stars Toward the Globular Cluster NGC 6496 With ATLAS and Gaia Photometry","authors":"Madison E. Martin,&nbsp;Andrew Layden,&nbsp;Andrew McNeill","doi":"10.1002/asna.70116","DOIUrl":"https://doi.org/10.1002/asna.70116","url":null,"abstract":"<p>We revisit 13 variable stars in the field of the metal-rich globular cluster NGC 6496, discovered by Abbas et al. (2015; <i>Astronomical Journal</i> 149:40) (hereafter referred to as “MA15”) via time-series data, spanning 2 years. We improve upon the MA15 characterization of the variables using ATLAS time-series photometry data, spanning 8 years, in the survey's custom cyan and orange filters. We search the Gaia Data Release 3 Variability Catalogue (2022) for additional variable objects within the 4.8-arcmin tidal radius of the cluster, finding that 11 of the 13 MA15 variables appear, along with 14 new “Gaia” variables. We access the Gaia proper motions in RA and Dec, the color index, the mean magnitude, and the radial velocity for each of the variables to assess cluster membership, finding that six variable stars are members and one is a possible member of NGC 6496. Finally, we report updated photometry, periods, and classifications of the variables discussed.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70116","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823228","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":"The ORCA-TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory","authors":"Martin M. Roth,&nbsp;Paško Roje,&nbsp;Stella Vješnica,&nbsp;Stefan Cikota,&nbsp;Alex J. Brown,&nbsp;Mike Kretlow,&nbsp;Marco Azzaro,&nbsp;Santiago Reinhart,&nbsp;Jesús Aceituno,&nbsp;Harry Dawson,&nbsp;Carsten Denker,&nbsp;Torsten Enßlin,&nbsp;Stephan Geier,&nbsp;Thomas Granzer,&nbsp;Thomas Kupfer,&nbsp;Gianluca Li Causi,&nbsp;Samaya Nissanke,&nbsp;José Luis Ortiz,&nbsp;Fernando Pedichini,&nbsp;Katja Poppenhäger,&nbsp;Axel Schwope","doi":"10.1002/asna.70110","DOIUrl":"https://doi.org/10.1002/asna.70110","url":null,"abstract":"<p>We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub-electron readout noise. Moreover, synchronized observations from two remote telescope sites will be used to explore new approaches for measuring Solar System bodies, precision stellar photometry, and speckle imaging. A fast-track installation of an ORCA-Quest 2 camera at the Calar Alto Observatory 1.23 m telescope has demonstrated the potential of the qCMOS technology for time domain astronomy. Numerical simulations suggest that owing to sub-electron readout noise, qCMOS sensors outperform classical CCDs for high-cadence imaging on 1 m-class telescopes. The small penalty for post-readout binning, that is almost insignificant in comparison to higher readout noise detectors, opens interesting applications for scene-dependent data processing in direct imaging, and potentially even for spectroscopy.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823247","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":"A Citizen Science Search for Compact Emission Line Nebulae","authors":"Bringfried Stecklum,&nbsp;Peter Bresseler","doi":"10.1002/asna.70121","DOIUrl":"https://doi.org/10.1002/asna.70121","url":null,"abstract":"<div>\u0000 \u0000 <p>In recent years, citizen science became an integral part of astronomy. Numerous projects contribute to important studies by involving large communities. While these are getting quite some attention, there are also individual efforts, which are nevertheless very valuable. Here, we report on results of a search for compact optical emission line nebulae, which are signposts of both young and evolved stars. The increased brightness in red photometric bands due to the contribution of shock-excited emission lines has been used as a tracer when examining optical broadband surveys. With the help of public databases, we identified and characterized associated sources if possible. Most of them are young stellar objects (YSOs).</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823338","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":"Issue Information: Astron. Nachr. 07/2026","authors":"","doi":"10.1002/asna.70130","DOIUrl":"https://doi.org/10.1002/asna.70130","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70130","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823334","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":"Speckle Observations With PISCO in Calern (France): III. Astrometric Measurements of Visual Double Stars in 2019 and New or Revised Orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB","authors":"J.-L. Prieur,&nbsp;M. Scardia,&nbsp;J.-P. Rivet,&nbsp;E. Aristidi,&nbsp;J. F. Ling,&nbsp;L. Piccotti,&nbsp;L. Pansecchi,&nbsp;R. W. Argyle,&nbsp;L. Abe,&nbsp;P. Bendjoya,&nbsp;L. Maccarini,&nbsp;D. Vernet","doi":"10.1002/asna.70115","DOIUrl":"https://doi.org/10.1002/asna.70115","url":null,"abstract":"<p>We present relative astrometric measurements of visual double stars, made in 2019 with the speckle camera PISCO at the 1-m Epsilon telescope of the C2PU facility (Observatoire de la Côte d'Azur, Calern site). Our observing list contains orbital couples as well as double stars whose motion is still uncertain. From our observations of 698 multiple stars, we obtained 679 new measurements with angular separations in the range 0″.1–7″.5, and an average accuracy of 0″.007. The mean error on the position angles is 0°.5. Most of the position angles were determined without the usual 180° ambiguity with the application of the direct vector method, the restricted correlation technique, and/or by inspection of the long integration files. We present new and revised orbits for STT531 AB, STT77 AB, STF1338 AB, COU1746, STT260, A1109 AB, HU1291, and A632 AB, partly derived from our PISCO observations. The corresponding estimated values for the masses of those systems are compatible with the spectral types.</p>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823155","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":"Magnetic Modulation Beneath the Period Gap: Evidence Through ER UMa Dwarf Nova Supercycles","authors":"Indika Medagangoda,&nbsp;Theekshana Piyadasa,&nbsp;Janaka Adassuriya,&nbsp;K. P. S. Chandana Jayaratne","doi":"10.1002/asna.70107","DOIUrl":"https://doi.org/10.1002/asna.70107","url":null,"abstract":"<div>\u0000 \u0000 <p>We analyzed long-term periodic variations of the supercycle (the interval between two superoutbursts) of four ER UMa-type dwarf novae (ER UMa, V1159 Ori, DI UMa, and IX Dra). Using multi-year V-band and visual (vis) photometry obtained from AAVSO, we constructed light curves, identified the epochs of individual superoutbursts, derived their ephemerides, and constructed O–C diagrams. The O–C residuals follow a structured, repeating pattern (quasi-periodic) across all four of the above-mentioned dwarf novae, indicating systematic modulation of the timing of the O–C residuals. Multi-year cycles were detected using a generalized Lomb-Scargle periodogram. This long-term periodic variation in ER UMa systems is consistent with a cycle similar to the solar activity cycle, likely generated by the dynamo effect in the secondary star. This Magnetic activity–driven phases changes in Roche-lobe filling can explain the enhanced mass-transfer rates and shortened supercycles in ER UMa systems. The results of magnetic activity in the donor also support the persistence of residual donor magnetic braking below the period gap in cataclysmic variables, challenging evolutionary models in which angular momentum loss (AML) declines abruptly across the fully convective boundary at the upper edge (∼3 h) of the period gap rather than undergoing a smooth transition.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 7","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823336","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":"Giants of the Universe: GRBs and the Cosmic Web","authors":"Istvan I. Racz,&nbsp;Istvan Horvath","doi":"10.1002/asna.70114","DOIUrl":"https://doi.org/10.1002/asna.70114","url":null,"abstract":"<div>\u0000 \u0000 <p>This presentation explores the cosmic giant structures revealed by gamma-ray bursts (GRBs). The spatial distribution of GRBs allows the identification of massive cosmic walls and clusters, challenging standard cosmological models. This analysis confirm the Hercules–Corona Borealis Great Wall, whose extent is significantly larger than previously thought. New data suggests the wall may span a redshift range of 0.33–2.43. Also there is a significant small group contains 4 GRBs around redshift 0.6. GRB clustering is a valuable tool for probing the cosmic large-scale structure, complementing galaxy and quasar observations. This presentation demonstrates how GRBs help us understand the Universe's greatest mysteries.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148753464","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":"Issue Information: Astron. Nachr. 06/2026","authors":"","doi":"10.1002/asna.70127","DOIUrl":"https://doi.org/10.1002/asna.70127","url":null,"abstract":"","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/asna.70127","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148753922","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":"Density Estimation of the GRBs' Redshift Distribution and Its Connection to Cosmic Star Formation History","authors":"Zsolt Bagoly,&nbsp;István I. Rácz,&nbsp;Lajos G. Balazs","doi":"10.1002/asna.70081","DOIUrl":"https://doi.org/10.1002/asna.70081","url":null,"abstract":"<div>\u0000 \u0000 <p>We analyze the Gamma-Ray Burst (GRB) redshift distribution using various density estimation methods. Several density estimators for one-dimensional point processes were tested for different sample sizes up to 1200 events. Our goal was to identify the “best” non-parametric radial density estimator for GRBs, and we found that Poisson noise significantly influences results. We identified Boundary Corrected Kernel Density Estimation as the most suitable method and applied it to a dataset of 542 GRBs with spectroscopic redshifts and reconstructed the GRB density function for different distances/redshifts. The relationship between the observed GRB redshift distribution and the cosmic star formation history is briefly discussed.</p>\u0000 </div>","PeriodicalId":55442,"journal":{"name":"Astronomische Nachrichten","volume":"347 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2026-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148754088","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}