A
Alex Lobel
Researcher at Royal Observatory of Belgium
Publications - 96
Citations - 10384
Alex Lobel is an academic researcher from Royal Observatory of Belgium. The author has contributed to research in topics: Stars & Astrometry. The author has an hindex of 24, co-authored 96 publications receiving 7696 citations.
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Journal ArticleDOI
Modeling Ultraviolet Wind Line Variability in Massive Hot Stars
Alex Lobel,Ronny Blomme +1 more
TL;DR: In this paper, the authors model the detailed time-evolution of discrete absorption components (DACs) observed in P Cygni profiles of the Si IV λ 1400 resonance doublet lines of the fast-rotating supergiant HD 64760 (B0.5 Ib).
Journal ArticleDOI
Gaia Early Data Release 3. Structure and properties of the Magellanic Clouds
Xavier Luri,Laurent Chemin,Gisella Clementini,H. E. Delgado,Paul J. McMillan,M. Romero-Gómez,E. Balbinot,Alfred Castro-Ginard,R. Mor,Vincenzo Ripepi,L. M. Sarro,Maria-Rosa L. Cioni,C. Fabricius,A. Garofalo,Amina Helmi,Tatiana Muraveva,Anthony G. A. Brown,Antonella Vallenari,Timo Prusti,J. H. J. de Bruijne,Carine Babusiaux,Carine Babusiaux,M. Biermann,O. L. Creevey,D. W. Evans,L. Eyer,A. Hutton,F. A. Jansen,Carme Jordi,Sergei A. Klioner,Uwe Lammers,Lennart Lindegren,Francois Mignard,C. Panem,Dimitri Pourbaix,Sofia Randich,P. Sartoretti,Caroline Soubiran,N. A. Walton,Frédéric Arenou,Coryn A. L. Bailer-Jones,Ulrich Bastian,Mark Cropper,R. Drimmel,D. Katz,M. G. Lattanzi,M. G. Lattanzi,F. van Leeuwen,J. Bakker,J. Castañeda,F. De Angeli,C. Ducourant,Morgan Fouesneau,Yves Fremat,Raphael Guerra,A. Guerrier,J. Guiraud,A. Jean-Antoine Piccolo,Eduard Masana,R. Messineo,Nami Mowlavi,C. Nicolas,Krzysztof Nienartowicz,F. Pailler,P. Panuzzo,F. Riclet,W. Roux,George M. Seabroke,Rosanna Sordo,Paolo Tanga,F. Thévenin,G. Gracia-Abril,Jordi Portell,David Teyssier,Martin Altmann,Martin Altmann,Rene Andrae,I. Bellas-Velidis,Kevin Benson,Jérôme Berthier,R. Blomme,E. Brugaletta,P. Burgess,G. Busso,Benoit Carry,Alberto Cellino,N. Cheek,Yassine Damerdji,Michael Davidson,Ludovic Delchambre,Aldo Dell'Oro,J. Fernández-Hernández,Laurent Galluccio,Pedro García-Lario,M. Garcia-Reinaldos,J. González-Núñez,J. González-Núñez,Eric Gosset,R. Haigron,J. L. Halbwachs,Nigel Hambly,D. L. Harrison,Despina Hatzidimitriou,Ulrike Heiter,Jose M Hernandez,Daniel Hestroffer,Simon Hodgkin,B. Holl,K. Janßen,G. Jevardat de Fombelle,Stefan Jordan,Alberto Krone-Martins,Alberto Krone-Martins,A. C. Lanzafame,A. C. Lanzafame,W. Löffler,A. Lorca,Minia Manteiga,O. Marchal,P. M. Marrese,P. M. Marrese,André Moitinho,A. Mora,Karri Muinonen,Karri Muinonen,P. Osborne,Elena Pancino,Elena Pancino,T. Pauwels,Alejandra Recio-Blanco,P. J. Richards,M. Riello,Lorenzo Rimoldini,Annie C. Robin,T. Roegiers,Jan Rybizki,Christos Siopis,Mike Smith,Alessandro Sozzetti,Ana Ulla,E. Utrilla,M. van Leeuwen,W. van Reeven,Ummi Abbas,A. Abreu Aramburu,S. Accart,Conny Aerts,Conny Aerts,Conny Aerts,J. J. Aguado,M. Ajaj,G. Altavilla,G. Altavilla,M. A. Álvarez,J. Álvarez Cid-Fuentes,João Alves,Richard I. Anderson,E. Anglada Varela,Teresa Antoja,Marc Audard,D. Baines,S. G. Baker,L. Balaguer-Núñez,Zoltan Balog,Zoltan Balog,C. Barache,D. Barbato,D. Barbato,M. Barros,Martin A. Barstow,S. Bartolomé,J.-L. Bassilana,N. Bauchet,A. Baudesson-Stella,Ugo Becciani,Michele Bellazzini,M. Bernet,Stefano Bertone,Stefano Bertone,Stefano Bertone,Luciana Bianchi,Sergi Blanco-Cuaresma,T. Boch,Alex Bombrun,Diego Bossini,S. Bouquillon,Angela Bragaglia,L. Bramante,Elmé Breedt,Alessandro Bressan,N. Brouillet,Beatrice Bucciarelli,A. Burlacu,Deborah Busonero,A. G. Butkevich,R. Buzzi,Elisabetta Caffau,Rossella Cancelliere,Hector Canovas,Tristan Cantat-Gaudin,Ruth Carballo,T. Carlucci,M. I. Carnerero,J. M. Carrasco,Laia Casamiquela,Marco Castellani,P. Castro Sampol,L. Chaoul,Patrick Charlot,Andrea Chiavassa,Giovanni Comoretto,W. J. Cooper,W. J. Cooper,T. Cornez,S. Cowell,F. Crifo,Mariateresa Crosta,C. Crowley,Carlos Dafonte,A. Dapergolas,M. David,P. David,P. de Laverny,F. De Luise,R. De March,J. De Ridder,R. E. de Souza,P. de Teodoro,A. de Torres,E. F. del Peloso,E. del Pozo,A. Delgado,J.-B. Delisle,P. Di Matteo,S. Diakite,C. Diener,Elisa Distefano,C. Dolding,D. Eappachen,D. Eappachen,Harry Enke,P. Esquej,C. Fabre,M. Fabrizio,M. Fabrizio,Simchon Faigler,Grigori Fedorets,Grigori Fedorets,Pierre Fernique,Pierre Fernique,Agnes Fienga,Agnes Fienga,Francesca Figueras,C. Fouron,Francesca Fragkoudi,E. Fraile,Felix Franke,Mario Gai,D. Garabato,A. Garcia-Gutierrez,Miguel García-Torres,P. Gavras,E. Gerlach,R. Geyer,Paolo Giacobbe,Gerry Gilmore,S. Girona,G. Giuffrida,Ángel Gómez,I. Gonzalez-Santamaria,J. J. González-Vidal,Mikael Granvik,Mikael Granvik,R. Gutiérrez-Sánchez,Leanne P. Guy,M. Hauser,M. Haywood,Sebastian L. Hidalgo,Sebastian L. Hidalgo,Thomas Hilger,N. Hładczuk,David Hobbs,G. Holland,H. E. Huckle,Gérard Jasniewicz,Peter G. Jonker,Peter G. Jonker,J. Juaristi Campillo,F. Julbe,L. Karbevska,Pierre Kervella,Sanjeev Khanna,A. Kochoska,M. Kontizas,Georges Kordopatis,Andreas Korn,Z. Kostrzewa-Rutkowska,Z. Kostrzewa-Rutkowska,K. Kruszyńska,Sébastien Lambert,A. F. Lanza,Y. Lasne,J. F. Le Campion,Y. Le Fustec,Y. Lebreton,Y. Lebreton,T. Lebzelter,Silvio Leccia,N. Leclerc,Isabelle Lecoeur-Taïbi,S. Liao,E. Licata,H. E. P. Lindstrøm,H. E. P. Lindstrøm,T. A. Lister,E. Livanou,Alex Lobel,P. Madrero Pardo,S. Managau,Robert G. Mann,Jon Marchant,Marcella Marconi,M. M. S. Marcos Santos,S. Marinoni,S. Marinoni,Federico Marocco,Douglas J. Marshall,L. Martin Polo,J. M. Martín-Fleitas,A. Masip,Davide Massari,Alessandra Mastrobuono-Battisti,Tsevi Mazeh,Sergio Messina,Daniel Michalik,N. R. Millar,Alexey Mints,D. Molina,Roberto Molinaro,László Molnár,László Molnár,Paolo Montegriffo,Roberto Morbidelli,Thierry Morel,Derek W. Morris,A. F. Mulone,D. Munoz,C. P. Murphy,Ilaria Musella,L. Noval,C. Ordénovic,G. Orrù,J. Osinde,C. Pagani,Isabella Pagano,L. Palaversa,P. A. Palicio,A. Panahi,Michał Pawlak,Michał Pawlak,X. Peñalosa Esteller,Antti Penttilä,A. M. Piersimoni,F. X. Pineau,Emese Plachy,Emese Plachy,G. Plum,E. Poggio,Ennio Poretti,E. Poujoulet,Andrej Prsa,L. Pulone,E. Racero,E. Racero,S. Ragaini,Monica Rainer,C. M. Raiteri,Nicolas Rambaux,P. Ramos,M. Ramos-Lerate,P. Re Fiorentin,S. Regibo,Céline Reylé,Alberto Riva,Guy Rixon,N. Robichon,C. Robin,Maroussia Roelens,L. Rohrbasser,Nicholas Rowell,F. Royer,Krzysztof A. Rybicki,G. Sadowski,A. Sagristà Sellés,Johannes Sahlmann,Jesus Salgado,E. Salguero,N. Samaras,V. Sanchez Gimenez,Nicoletta Sanna,R. Santoveña,M. Sarasso,Mathias Schultheis,Eva Sciacca,M. Segol,J. C. Segovia,Damien Ségransan,D. Semeux,H. I. Siddiqui,Arnaud Siebert,Arnaud Siebert,L. Siltala,Eric Slezak,R. L. Smart,Enrique Solano,F. Solitro,D. Souami,D. Souami,J. Souchay,Alessandro Spagna,Federica Spoto,Iain A. Steele,H. Steidelmüller,C. A. Stephenson,Maria Süveges,Maria Süveges,Maria Süveges,Laszlo Szabados,E. Szegedi-Elek,F. Taris,G. Tauran,Mark Taylor,Ramachrisna Teixeira,William Thuillot,N. Tonello,F. Torra,J. Torra,C. Turon,N. Unger,M. Vaillant,E. van Dillen,O. Vanel,Alberto Vecchiato,Y. Viala,D. Vicente,S. Voutsinas,M. Weiler,Thomas Wevers,Łukasz Wyrzykowski,A. Yoldas,P. Yvard,H. Zhao,Juan Zorec,Shay Zucker,C. Zurbach,Tomaz Zwitter +455 more
Abstract: Context. This work is part of the Gaia Data Processing and Analysis Consortium papers published with the Gaia Early Data Release 3 (EDR3). It is one of the demonstration papers aiming to highlight the improvements and quality of the newly published data by applying them to a scientific case.Aims. We use the Gaia EDR3 data to study the structure and kinematics of the Magellanic Clouds. The large distance to the Clouds is a challenge for the Gaia astrometry. The Clouds lie at the very limits of the usability of the Gaia data, which makes the Clouds an excellent case study for evaluating the quality and properties of the Gaia data.Methods. The basis of our work are two samples selected to provide a representation as clean as possible of the stars of the Large Magellanic Cloud (LMC) and the Small Magellanic Cloud (SMC). The selection used criteria based on position, parallax, and proper motions to remove foreground contamination from the Milky Way, and allowed the separation of the stars of both Clouds. From these two samples we defined a series of subsamples based on cuts in the colour-magnitude diagram; these subsamples were used to select stars in a common evolutionary phase and can also be used as approximate proxies of a selection by age.Results. We compared the Gaia Data Release 2 and Gaia EDR3 performances in the study of the Magellanic Clouds and show the clear improvements in precision and accuracy in the new release. We also show that the systematics still present in the data make the determination of the 3D geometry of the LMC a difficult endeavour; this is at the very limit of the usefulness of the Gaia EDR3 astrometry, but it may become feasible with the use of additional external data. We derive radial and tangential velocity maps and global profiles for the LMC for the several subsamples we defined. To our knowledge, this is the first time that the two planar components of the ordered and random motions are derived for multiple stellar evolutionary phases in a galactic disc outside the Milky Way, showing the differences between younger and older phases. We also analyse the spatial structure and motions in the central region, the bar, and the disc, providing new insightsinto features and kinematics. Finally, we show that the Gaia EDR3 data allows clearly resolving the Magellanic Bridge, and we trace the density and velocity flow of the stars from the SMC towards the LMC not only globally, but also separately for young and evolved populations. This allows us to confirm an evolved population in the Bridge that is slightly shift from the younger population. Additionally, we were able to study the outskirts of both Magellanic Clouds, in which we detected some well-known features and indications of new ones.
Journal ArticleDOI
Gaia Early Data Release 3: Structure and properties of the Magellanic Clouds
Xavier Luri,L. Chemin,G. Clementini,H. E. Delgado,Paul J. McMillan,M. Romero-Gómez,Eduardo Balbinot,Alfred Castro-Ginard,R. Mor,V. Ripepi,L. M. Sarro,M. R. L. Cioni,C. Fabricius,A. Garofalo,Amina Helmi,Tatiana Muraveva,Anthony G. A. Brown,Antonella Vallenari,Timo Prusti,J.H.J. de,Carine Babusiaux,M. Biermann,O. L. Creevey,D. W. Evans,L. Eyer,A. Hutton,F. A. Jansen,Carme Jordi,Sergei A. Klioner,Uwe Lammers,Lennart Lindegren,Francois Mignard,C. Panem,Dimitri Pourbaix,Sofia Randich,P. Sartoretti,Caroline Soubiran,N. A. Walton,Frédéric Arenou,Coryn A. L. Bailer-Jones,Ulrich Bastian,Mark Cropper,R. Drimmel,D. Katz,Massimiliano Lattanzi,F.E. van Leeuwen,Joost M. Bakker,J. Castañeda,F. De,C. Ducourant,Morgan Fouesneau,Yves Fremat,Raphael Guerra,A. Guerrier,J. Guiraud,A. Jean-Antoine,Eduard Masana,R. Messineo,Nami Mowlavi,C. Nicolas,Krzysztof Nienartowicz,F. Pailler,P. Panuzzo,F. Riclet,W. Roux,George M. Seabroke,Rosanna Sordo,Paolo Tanga,F. Thévenin,G. Gracia-Abril,Jordi Portell,D. Teyssier,M. Altmann,Rene Andrae,I. Bellas-Velidis,Kevin Benson,Jérôme Berthier,R. Blomme,E. Brugaletta,Paul W. Burgess,G. Busso,Benoit Carry,A. Cellino,N. Cheek,Yassine Damerdji,Michael Davidson,Ludovic Delchambre,Aldo Dell'Oro,J. Fernández-Hernández,Laurent Galluccio,Pedro García-Lario,M. Garcia-Reinaldos,J. González-Núñez,E. Gosset,R. Haigron,J. L. Halbwachs,Nigel Hambly,D. L. Harrison,Despina Hatzidimitriou,Ulrike Heiter,Jonay I. González Hernández,Daniel Hestroffer,S. T. Hodgkin,B. Holl,K. Janßen,G. Jevardat de Fombelle,Stefan Jordan,Alberto Krone-Martins,A. C. Lanzafame,W. Löffler,A. Lorca,Minia Manteiga,O. Marchal,P. M. Marrese,André Moitinho,A. Mora,Karri Muinonen,P. Osborne,E. Pancino,T. Pauwels,A. Recio-Blanco,P. J. Richards,M. Riello,L. Rimoldini,Annie C. Robin,T. Roegiers,Jan Rybizki,Christos Siopis,M. N. K. Smith,Alessandro Sozzetti,Ana Ulla,E. Utrilla,M. van Leeuwen,W. van Reeven,Ummi Abbas,A. Abreu,S. Accart,Conny Aerts,J.J. Aguado,M. Ajaj,G. Altavilla,M. A. Álvarez,J. Álvarez Cid-Fuentes,Joao Alves,Richard I. Anderson,E. Anglada Varela,Teresa Antoja,Marc Audard,D. Baines,S. G. Baker,L. Balaguer-Núñez,Zoltan Balog,Christophe Barache,D. Barbato,M. Barros,Martin A. Barstow,S. Bartolomé,J.-L. Bassilana,N. Bauchet,A. Baudesson-Stella,Ugo Becciani,M. Bellazzini,M. Bernet,Stefano Bertone,Luciana Bianchi,S. Blanco-Cuaresma,T. Boch,Alex Bombrun,Diego Bossini,S. Bouquillon,A. Bragaglia,L. Bramante,Elmé Breedt,A. Bressan,N. Brouillet,B. Bucciarelli,A. Burlacu,Deborah Busonero,A. G. Butkevich,R. Buzzi,Elisabetta Caffau,Rossella Cancelliere,Hector Canovas,Tristan Cantat-Gaudin,Ruth Carballo,T. Carlucci,M. I. Carnerero,J. M. Carrasco,Laia Casamiquela,Marco Castellani,P. Castro Sampol,L. Chaoul,Patrick Charlot,Andrea Chiavassa,Giovanni Comoretto,W. J. Cooper,T. Cornez,S. Cowell,F. Crifo,M. Crosta,C. Crowley,Carlos Dafonte,A. Dapergolas,Mario David,P. David,P. de Laverny,F. De Luise,R. De March,J. De Ridder,R. E. de Souza,P. de Teodoro,A. de Torres,E. F. del Peloso,E. del Pozo,Antonio Delgado,J.-B. Delisle,P. Di Matteo,S. Diakite,C. Diener,Elisa Distefano,C. Dolding,D. Eappachen,Harry Enke,P. Esquej,C. Fabre,M. Fabrizio,Simchon Faigler,Grigori Fedorets,Pierre Fernique,Agnes Fienga,Francesca Figueras,C. Fouron,Francesca Fragkoudi,E. Fraile,Felix Franke,Mario Gai,D. Garabato,A. Garcia-Gutierrez,Miguel García-Torres,P. Gavras,E. Gerlach,R. Geyer,P. Giacobbe,Gerry Gilmore,S. Girona,G. Giuffrida,A. E. Gomez,I. Gonzalez-Santamaria,J.J. González-Vidal,Mikael Granvik,R. Gutiérrez-Sánchez,Leanne P. Guy,M. Hauser,Misha Haywood,Sebastian L. Hidalgo,Thomas Hilger,N. Hładczuk,David Hobbs,G. Holland,H. E. Huckle,G. Jasniewicz,P.G. Jonker,J. Juaristi,F. Julbe,L. Karbevska,Pierre Kervella,Sanjeev Khanna,A. Kochoska,M. Kontizas,G. Kordopatis,Andreas Korn,Z. Kostrzewa-Rutkowska,K. Kruszyńska,Sébastien Lambert,A. F. Lanza,Y. Lasne,J. F. Le Campion,Y. Le Fustec,Yveline Lebreton,T. Lebzelter,S. Leccia,N. Leclerc,Isabelle Lecoeur-Taïbi,Shilong Liao,E. Licata,H. E. P. Lindstrøm,T. A. Lister,E. Livanou,Alex Lobel,P. Madrero,S. Managau,Robert G. Mann,Jon Marchant,Marcella Marconi,M.M.S. Marcos,S. Marinoni,Federico Marocco,D. J. Marshall,L. Martin Polo,J. M. Martín-Fleitas,A. Masip,Davide Massari,Alessandra Mastrobuono-Battisti,Tsevi Mazeh,S. Messina,Daniel Michalik,N.R. Millar,Alexey Mints,D. Molina,Roberto Molinaro,László Molnár,Paolo Montegriffo,R. Morbidelli,Thierry Morel,Derek W. Morris,A.F. Mulone,D. Munoz,C. P. Murphy,Ilaria Musella,L. Noval,C. Ordenovic,G. Orrù,J. Osinde,C. Pagani,I. Pagano,L. Palaversa,P. A. Palicio,A. Panahi,Michał Pawlak,X. Peñalosa,Antti Penttilä,A. M. Piersimoni,F. X. Pineau,Emese Plachy,G. Plum,E. Poggio,E. Poretti,E. Poujoulet,Andrej Prsa,L. Pulone,E. Racero,S. Ragaini,M. Rainer,C. M. Raiteri,Nicolas Rambaux,P. Ramos,M. Ramos-Lerate,P. Re,S. Regibo,Céline Reylé,Alberto Riva,Guy Rixon,N. Robichon,C. Robin,Maroussia Roelens,L. Rohrbasser,Nicholas Rowell,Frédéric Royer,Krzysztof A. Rybicki,G. Sadowski,A. Sagristà,Johannes Sahlmann,Jesus Salgado,E. Salguero,N. Samaras,V. Sanchez,Nicoletta Sanna,R. Santoveña,M. Sarasso,M. Schultheis,Eva Sciacca,M. Segol,J. C. Segovia,D. Segransan,D. Semeux,H. Siddiqui,A. Siebert,L. Siltala,Eric Slezak,R. L. Smart,E. Solano,F. Solitro,D. Souami,J. Souchay,A. Spagna,F. Spoto,Iain A. Steele,H. Steidelmüller,C.A. Stephenson,Maria Süveges,László Szabados,E. Szegedi-Elek,Francois Taris,G. Tauran,Mark Taylor,Ramachrisna Teixeira,William Thuillot,N. Tonello,F. Torra,J. Torra,C. Turon,N. Unger,M. Vaillant,E. van,O. Vanel,Alberto Vecchiato,Y. Viala,D. Vicente,S. Voutsinas,M. Weiler,Thomas Wevers,Łukasz Wyrzykowski,A. Yoldas,P. Yvard,H. Zhao,J. Zorec,Shay Zucker,C. Zurbach,Tomaz Zwitter +418 more
TL;DR: In this paper, the authors compare Gaia DR2 and Gaia EDR3 performances in the study of the Magellanic Clouds and show the clear improvements in precision and accuracy in the new release.
Journal ArticleDOI
The gaia -ESO survey : Calibration strategy
Elena Pancino,Elena Pancino,Carmela Lardo,G. Altavilla,S. Marinoni,S. Marinoni,S. Ragaini,G. Cocozza,Michele Bellazzini,Elena Sabbi,Manuela Zoccali,Manuela Zoccali,P. Donati,P. Donati,Ulrike Heiter,Sergey E. Koposov,R. Blomme,Thierry Morel,Sergio Simón-Díaz,Sergio Simón-Díaz,Alex Lobel,Caroline Soubiran,Josefina Montalbán,Josefina Montalbán,Marica Valentini,Andrew R. Casey,S. Blanco-Cuaresma,Paula Jofre,Paula Jofre,Clare Worley,Laura Magrini,A. Hourihane,P. Francois,P. Francois,Sofia Feltzing,Gerard Gilmore,Sofia Randich,Martin Asplund,Piercarlo Bonifacio,Janet E. Drew,R. D. Jeffries,Giuseppina Micela,Antonella Vallenari,Emilio J. Alfaro,C. Allende Prieto,C. Allende Prieto,C. Babusiaux,Thomas Bensby,Angela Bragaglia,Ettore Flaccomio,Nigel Hambly,Andreas Korn,A. C. Lanzafame,A. C. Lanzafame,Rodolfo Smiljanic,S. Van Eck,Nicholas A. Walton,Amelia Bayo,Giovanni Carraro,M. T. Costado,Francesco Damiani,Bengt Edvardsson,E. Franciosini,Antonio Frasca,James R. Lewis,Lorenzo Monaco,L. Morbidelli,L. Prisinzano,G. G. Sacco,Luca Sbordone,Luca Sbordone,Luca Sbordone,S. G. Sousa,Simone Zaggia,Andreas Koch +74 more
TL;DR: In this paper, the authors present the strategy behind the selection of astrophysical calibration targets, ensuring that all Gaia-ESO results on radial velocities, atmospheric parameters, and chemical abundance ratios will be both internally consistent and easily comparable with other literature results.
Journal ArticleDOI
Galactic spiral structure revealed by Gaia EDR3
E. Poggio,E. Poggio,Ronald Drimmel,Tristan Cantat-Gaudin,P. Ramos,Vincenzo Ripepi,E. Zari,Rene Andrae,R. Blomme,Laurent Chemin,Gisella Clementini,F. Figueras,Morgan Fouesneau,Yves Fremat,Alex Lobel,D. J. Marshall,D. J. Marshall,T. Muraveva,M. Romero-Gómez +18 more
TL;DR: In this paper, the authors derived maps of relative over-and under-dense regions for UMS stars in the Galactic disc using both bivariate kernel density estimators and wavelet transformations.