Spectroscopic and evolutionary analyses of the binary system AzV 14 outline paths toward the WR stage at low metallicity
D. K. Pauli,Lidia M. Oskinova,W.-R. Hamann,Dominic M. Bowman,Helge Todt,Tomer Shenar,Angelika Sander,C. Erba,V. M. A. G'omez-Gonz'alez,C. Kehrig,J. Klencki,Rolf Kuiper,Angela C. Mehner,S. E. de Mink,M. S. Oey,Varsha Ramachandran,A. Schootemeijer,S. R. Serantes,Aida Wofford +18 more
- Vol. 673, pp A40-A40
TLDR
In this paper , an analysis of the massive O star AzV 14 was conducted to determine its fundamental and stellar wind parameters, which were then used to investigate evolutionary paths from the O-type to the Wolf-Rayet stage with stellar evolutionary models.Abstract:
The origin of the observed population of Wolf-Rayet (WR) stars in low-metallicity (low-Z) galaxies, such as the Small Magellanic Cloud (SMC), is not yet understood. Standard, single-star evolutionary models predict that WR stars should stem from very massive O-type star progenitors, but these are very rare. On the other hand, binary evolutionary models predict that WR stars could originate from primary stars in close binaries. We conduct an analysis of the massive O star, AzV 14, to spectroscopically determine its fundamental and stellar wind parameters, which are then used to investigate evolutionary paths from the O-type to the WR stage with stellar evolutionary models. Multi-epoch UV and optical spectra of AzV 14 are analyzed using the non-LTE stellar atmosphere code PoWR. An optical TESS light curve was extracted and analyzed using the PHOEBE code. The obtained parameters are put into an evolutionary context, using the MESA code. AzV 14 is a close binary system consisting of two similar main sequence stars with masses of 32 Msol. Both stars have weak stellar winds with mass-loss rates of log $\dot{M}$ = -7.7. Binary evolutionary models can explain the empirically derived stellar and orbital parameters. The model predicts that the primary will evolve into a WR star with T = 100 kK, while the secondary, which will accrete significant amounts of mass during the first mass transfer phase, will become a cooler WR star with T = 50 kK and are predicted to have compared to other WR stars increased oxygen abundances. This model prediction is supported by a spectroscopic analysis of a WR star in the SMC. We hypothesize that the populations of WR stars in low-Z galaxies may have bimodal temperature distributions. Hotter WR stars might originate from primary stars, while cooler WR stars are the evolutionary descendants of the secondary stars if they accreted a significant amount of mass.read more
Citations
More filters
Journal ArticleDOI
A low-metallicity massive contact binary undergoing slow Case A mass transfer: A detailed spectroscopic and orbital analysis of SSN 7 in NGC 346 in the SMC
M.J. Rickard,D. K. Pauli +1 more
TL;DR: In this paper , a consistent spectral and orbital analysis of the early-type massive binary SSN 7 hosting a ON If$^\ast$+O5.5 V((f)) star is presented.
References
More filters
Journal ArticleDOI
emcee: The MCMC Hammer
TL;DR: The emcee algorithm as mentioned in this paper is a Python implementation of the affine-invariant ensemble sampler for Markov chain Monte Carlo (MCMC) proposed by Goodman & Weare (2010).
Journal ArticleDOI
emcee: The MCMC Hammer
TL;DR: This document introduces a stable, well tested Python implementation of the affine-invariant ensemble sampler for Markov chain Monte Carlo (MCMC) proposed by Goodman & Weare (2010).
Journal ArticleDOI
The Gaia mission
T. Prusti,J. H. J. de Bruijne,Anthony G. A. Brown,Antonella Vallenari,C. Babusiaux,C. A. L. Bailer-Jones,Ulrich Bastian,M. Biermann,D. W. Evans,L. Eyer,F. A. Jansen,Carme Jordi,Sergei A. Klioner,Uwe Lammers,Lennart Lindegren,Xavier Luri,Francois Mignard,D. J. Milligan,C. Panem,V. Poinsignon,Dimitri Pourbaix,Sofia Randich,G. Sarri,P. Sartoretti,H. I. Siddiqui,Caroline Soubiran,V. Valette,F. van Leeuwen,N. A. Walton,Conny Aerts,Frédéric Arenou,Mark Cropper,R. Drimmel,Erik Høg,D. Katz,Mario G. Lattanzi,W. O'Mullane,Eva K. Grebel,Andrew D. Holland,C. Huc,X. Passot,L. Bramante,Carla Cacciari,J. Castañeda,L. Chaoul,N. Cheek,F. De Angeli,C. Fabricius,Raphael Guerra,Jose M Hernandez,A. Jean-Antoine-Piccolo,Eduard Masana,R. Messineo,Nami Mowlavi,Krzysztof Nienartowicz,D. Ordóñez-Blanco,Pasquale Panuzzo,Jordi Portell,P. J. Richards,M. Riello,George M. Seabroke,Paolo Tanga,F. Thévenin,J. Torra,Sebastian Els,G. Gracia-Abril,G. Comoretto,M. Garcia-Reinaldos,T. Lock,E. Mercier,Martin Altmann,Rene Andrae,Tri L. Astraatmadja,I. Bellas-Velidis,Kevin Benson,Jérôme Berthier,R. Blomme,G. Busso,Benoit Carry,Alberto Cellino,Gisella Clementini,S. Cowell,O. L. Creevey,J. Cuypers,Michael Davidson,J. De Ridder,A. de Torres,Ludovic Delchambre,Aldo Dell'Oro,C. Ducourant,Yves Fremat,Miguel García-Torres,Eric Gosset,J. L. Halbwachs,Nigel Hambly,D. L. Harrison,M. Hauser,Daniel Hestroffer,Simon Hodgkin,H. E. Huckle,A. Hutton,Gérard Jasniewicz,Stefan Jordan,M. Kontizas,Andreas Korn,A. C. Lanzafame,Minia Manteiga,André Moitinho,Karri Muinonen,J. Osinde,Elena Pancino,T. Pauwels,J. M. Petit,Alejandra Recio-Blanco,Annie C. Robin,L. M. Sarro,Christos Siopis,M. J. S. Smith,K. W. Smith,Alessandro Sozzetti,William Thuillot,W. van Reeven,Y. Viala,Ummi Abbas,A. Abreu Aramburu,S. Accart,J. J. Aguado,P. M. Allan,Walter Allasia,G. Altavilla,M. A. Álvarez,João Alves,Richard I. Anderson,Alexandre Humberto Andrei,E. Anglada Varela,E. Antiche,Teresa Antoja,Sonia Anton,Bernardino Arcay,A. Atzei,L. Ayache,N. Bach,S. G. Baker,L. Balaguer-Núñez,Christophe Barache,C. Barata,Antoine Barbier,F. Barblan,M. Baroni,D. Barrado y Navascués,M. Barros,Martin A. Barstow,Ugo Becciani,Michele Bellazzini,G. Bellei,A. Bello García,Vasily Belokurov,Philippe Bendjoya,A. Berihuete,Luciana Bianchi,Olivier Bienaymé,F. Billebaud,Nadejda Blagorodnova,S. Blanco-Cuaresma,T. Boch,Alex Bombrun,R. Borrachero,S. Bouquillon,G. Bourda,Hervé Bouy,Angela Bragaglia,Maarten A. Breddels,N. Brouillet,T. Brüsemeister,Beatrice Bucciarelli,F. Budnik,P. Burgess,R. Burgon,A. Burlacu,Deborah Busonero,R. Buzzi,Elisabetta Caffau,J. Cambras,Heather Campbell,Rossella Cancelliere,Tristan Cantat-Gaudin,T. Carlucci,J. M. Carrasco,Marco Castellani,P. Charlot,J. Charnas,P. Charvet,F. Chassat,Andrea Chiavassa,M. Clotet,G. Cocozza,Ross Collins,P. Collins,G. Costigan,F. Crifo,Nicholas Cross,Mariateresa Crosta,C. Crowley,Carlos Dafonte,Yassine Damerdji,A. Dapergolas,P. David,M. David,P. De Cat,F. de Felice,P. de Laverny,F. De Luise,R. De March,D. de Martino,R. E. de Souza,Jonas Debosscher,E. del Pozo,Marco Delbo,A. Delgado,H. E. Delgado,F. di Marco,P. Di Matteo,S. Diakite,Elisa Distefano,C. Dolding,S. dos Anjos,P. Drazinos,J. Durán,Y. Dzigan,E. Ecale,Bengt Edvardsson,Harry Enke,M. Erdmann,D. Escolar,M. Espina,Nick Evans,G. Eynard Bontemps,C. Fabre,M. Fabrizio,Simchon Faigler,A. J. Falcão,M. Farràs Casas,F. Faye,Luciana Federici,Grigori Fedorets,J. Fernández-Hernández,Pierre Fernique,Agnes Fienga,Francesca Figueras,F. Filippi,K. Findeisen,A. Fonti,Morgan Fouesneau,E. Fraile,Morgan Fraser,J. Fuchs,R. Furnell,Mario Gai,S. Galleti,Laurent Galluccio,D. Garabato,F. García-Sedano,P. Gare,A. Garofalo,N. Garralda,P. Gavras,J. Gerssen,R. Geyer,Gerry Gilmore,S. Girona,G. Giuffrida,M. Gomes,Ana González-Marcos,J. González-Núñez,J. J. González-Vidal,Mikael Granvik,A. Guerrier,Patrick Guillout,J. Guiraud,A. Gúrpide,R. Gutiérrez-Sánchez,Leanne P. Guy,R. Haigron,Despina Hatzidimitriou,Misha Haywood,Ulrike Heiter,Amina Helmi,David Hobbs,W. Hofmann,B. Holl,G. Holland,Julie Ann Hunt,A. Hypki,V. Icardi,Mike Irwin,G. Jevardat de Fombelle,Paula Jofre,Peter G. Jonker,Alain Jorissen,F. Julbe,A. Karampelas,A. Kochoska,R. Kohley,Katrien Kolenberg,E. Kontizas,Sergey E. Koposov,Georges Kordopatis,P. Koubsky,A. Kowalczyk,Alberto Krone-Martins,M. Kudryashova,I. Kull,R. K. Bachchan,F. Lacoste-Seris,Antonino F. Lanza,J.-B. Lavigne,C. Le Poncin-Lafitte,Yveline Lebreton,T. Lebzelter,Silvio Leccia,N. Leclerc,Isabelle Lecoeur-Taïbi,Vincent Lemaitre,H. Lenhardt,F. Leroux,Shilong Liao,E. Licata,H. E. P. Lindstrøm,T. A. Lister,E. Livanou,Alex Lobel,W. Löffler,M. López,A. Lopez-Lozano,D. Lorenz,T. Loureiro,I. MacDonald,T. Magalhães Fernandes,S. Managau,Robert G. Mann,G. Mantelet,O. Marchal,Jon Marchant,Marcella Marconi,J. Marie,S. Marinoni,P. M. Marrese,G. Marschalkó,D. J. Marshall,J. M. Martín-Fleitas,M. Martino,Nicolas Mary,Gal Matijevic,Tsevi Mazeh,Paul J. McMillan,S. Messina,A. Mestre,Daniel Michalik,N. R. Millar,B. M. H. Miranda,D. Molina,Roberto Molinaro,Marco Molinaro,László Molnár,M. Moniez,Paolo Montegriffo,D. Monteiro,R. Mor,A. Mora,Roberto Morbidelli,Thierry Morel,Stephan Morgenthaler,T. Morley,Derek W. Morris,A. F. Mulone,Tatiana Muraveva,Ilaria Musella,J. Narbonne,Gijs Nelemans,Luciano Nicastro,L. Noval,C. Ordenovic,Joaquín Ordieres-Meré,P. Osborne,C. Pagani,Isabella Pagano,F. Pailler,H. Palacin,L. Palaversa,P. Parsons,T. Paulsen,M. Pecoraro,R. Pedrosa,H. Pentikäinen,J. Pereira,B. Pichon,A. M. Piersimoni,F. X. Pineau,Emese Plachy,G. Plum,E. Poujoulet,Andrej Prsa,L. Pulone,S. Ragaini,S. Rago,Nicolas Rambaux,M. Ramos-Lerate,Piero Ranalli,Grégor Rauw,A. M. Read,S. Regibo,F. Renk,Céline Reylé,Rita A. Ribeiro,Lorenzo Rimoldini,Vincenzo Ripepi,Alberto Riva,Guy Rixon,Maroussia Roelens,M. Romero-Gómez,Nicholas Rowell,Frédéric Royer,Anja Rudolph,L. Ruiz-Dern,G. Sadowski,T. Sagristà Sellés,Johannes Sahlmann,Jesus Salgado,E. Salguero,M. Sarasso,H. Savietto,A. Schnorhk,M. Schultheis,Eva Sciacca,M. Segol,J. C. Segovia,Damien Ségransan,E. Serpell,I.-C. Shih,Riccardo Smareglia,Richard L. Smart,Caleb Smith,Enrique Solano,F. Solitro,Rosanna Sordo,Sonia Nieto,J. Souchay,Alessandro Spagna,Federica Spoto,U. Stampa,Iain A. Steele,H. Steidelmüller,C.A. Stephenson,H. Stoev,F. F. Suess,Maria Süveges,Jean Surdej,László Szabados,E. Szegedi-Elek,D. Tapiador,F. Taris,G. Tauran,Mark Taylor,Ramachrisna Teixeira,D. Terrett,Brandon Tingley,Scott Trager,C. Turon,Ana Ulla,E. Utrilla,Gaetano Valentini,A. van Elteren,E. Van Hemelryck,M. van Leeuwen,M. Varadi,Alberto Vecchiato,Jovan Veljanoski,T. Via,D. Vicente,Steven S. Vogt,Holger Voss,Viktor Votruba,S. Voutsinas,G. Walmsley,M. Weiler,K. Weingrill,D. Werner,Thomas Wevers,G. Whitehead,Łukasz Wyrzykowski,A. Yoldas,M. Žerjal,Shay Zucker,C. Zurbach,Tomaz Zwitter,A. Alecu,M. Allen,C. Allende Prieto,António Amorim,Guillem Anglada-Escudé,V. Arsenijevic,S. Azaz,P. Balm,M. Beck,H.-H. Bernstein,Lionel Bigot,Albert Bijaoui,C. Blasco,M. Bonfigli,Giuseppe Bono,Steve Boudreault,Alessandro Bressan,S. Brown,P.-M. Brunet,P. S. Bunclark,R. Buonanno,A. G. Butkevich,C. Carret,C. Carrion,Laurent Chemin,F. Chéreau,Leonardo Corcione,E. Darmigny,K. S. de Boer,P. de Teodoro,P. T. de Zeeuw,C. Delle Luche,Catherine Dominguès,Pierre Dubath,F. Fodor,B. Frézouls,A. Fries,Diego Fustes,D. Fyfe,E. Gallardo,J. Gallegos,Daniele Gardiol,M. Gebran,A. Gomboc,A. E. Gomez,E. Grux,A. Gueguen,A. Heyrovsky,J. Hoar,G. Iannicola,Y. Isasi Parache,A.-M. Janotto,E. Joliet,A. Jonckheere,R. Keil,Dae-Won Kim,Peter Klagyivik,Joakim Klar,J. Knude,Oleg Kochukhov,I. Kolka,Janez Kos,A. Kutka,Valéry Lainey,D. LeBouquin,Chao Liu,Davide Loreggia,Valeri V. Makarov,M. Marseille,Christophe Martayan,O. Martinez-Rubi,B. Massart,F. Meynadier,Shan Mignot,Ulisse Munari,A.-T. Nguyen,Thomas Nordlander,P. Ocvirk,K. S. O'Flaherty,A. Olias Sanz,P. Ortiz,J. Osorio,Dagmara Oszkiewicz,A. Ouzounis,M. Palmer,P. Park,Ester Pasquato,C. Peltzer,J. Peralta,F. Péturaud,T. Pieniluoma,E. Pigozzi,J. Poels,G. Prat,Thibaut Prod'homme,F. Raison,José Manuel Rebordão,D. Risquez,Brigitte Rocca-Volmerange,Simon Rosen,M. I. Ruiz-Fuertes,Federico Russo,Steven Sembay,I. Serraller Vizcaino,A. Short,A. Siebert,H. Silva,D. Sinachopoulos,Eric Slezak,Michael Soffel,Danuta Sosnowska,V. Straižys,M. ter Linden,Dirk Terrell,Stephan Theil,C. Tiede,L. Troisi,P. Tsalmantza,D. Tur,Mattia Vaccari,Frédéric Vachier,P. Valles,W. Van Hamme,L. Veltz,Jenni Virtanen,J.-M. Wallut,R. Wichmann,Mark I. Wilkinson,H. Ziaeepour,Sven Zschocke +624 more
TL;DR: Gaia as discussed by the authors is a cornerstone mission in the science programme of the European Space Agency (ESA). The spacecraft construction was approved in 2006, following a study in which the original interferometric concept was changed to a direct-imaging approach.
Journal ArticleDOI
Modules for Experiments in Stellar Astrophysics (MESA)
Bill Paxton,Lars Bildsten,Aaron Dotter,Aaron Dotter,Falk Herwig,Pierre Lesaffre,Francis Timmes +6 more
TL;DR: Modules for Experiments in Stellar Astrophysics (MESA) as mentioned in this paper is a suite of open source, robust, efficient, thread-safe libraries for a wide range of applications in computational stellar astrophysics.