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Autor:
Luca Sbordone, M. Spite, P. Di Matteo, Elisabetta Caffau, T. Sivarani, Francois Spite, A. M. Matas Pinto, Matthias Steffen, P. Francois, P. Bonifacio
Publikováno v:
Astronomy & Astrophysics. 654:A170
Context. The study of old, metal-poor stars deepens our knowledge on the early stages of the universe. In particular, the study of these stars gives us a valuable insight into the masses of the first massive stars and their emission of ionising photo
Autor:
N. Rothbart, Z. Makai, M. Roellig, F. Comerón, Edward Polehampton, Rolf Guesten, Christof Buchbender, Nicola Schneider, Yoko Okada, A. Parikka, Sylvain Bontemps, A. A. Djupvik, R. Simon, Glenn J. White
Publikováno v:
Astronomy & Astrophysics. 653:A108
IRAS 20319+3958 in Cygnus X South is a rare example of a free-floating globule (mass ~240 Msun, length ~1.5 pc) with an internal HII region created by the stellar feedback of embedded intermediate-mass stars, in particular, one Herbig Be star. Here,
Publikováno v:
Astronomy & Astrophysics. 653:A28
Context. Observations of young, low-mass, main-sequence, and zero-age main-sequence stars show evidence of a correlation between lithium abundance and chromospheric activity, albeit with a very large scatter. Fast rotation stars (including T Tauri st
Publikováno v:
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 653, pp.A26. ⟨10.1051/0004-6361/202141291⟩
Astronomy and Astrophysics-A&A, 2021, 653, pp.A26. ⟨10.1051/0004-6361/202141291⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 653, pp.A26. ⟨10.1051/0004-6361/202141291⟩
Astronomy and Astrophysics-A&A, 2021, 653, pp.A26. ⟨10.1051/0004-6361/202141291⟩
Altair is the fastest rotating star at less than 10 parsecs from the Sun. Its precise modelling is a landmark for our understanding of stellar evolution with fast rotation, and all observational constraints are most welcome to better determine the fu
Publikováno v:
Astronomy & Astrophysics. 653:A142
Context. The presence of three more Herbig Ae/Be (HAeBe) candidates in the Cepheus Flare within a 1.5° radius centered on HD 200775 suggests that star formation is prevalent in a wider region of the LDN 1147/1158, LDN 1172/1174, and LDN 1177 clouds.
Autor:
Rinat Tagirov, N. M. Kostogryz, Sami K. Solanki, R. L. Kurucz, V. Witzke, Yvonne C. Unruh, M. Cernetic, Alexander Shapiro, L. S. Anusha
Publikováno v:
Astronomy & Astrophysics. 653:A65
Context. Stellar spectral synthesis is essential for various applications, ranging from determining stellar parameters to comprehensive stellar variability calculations. New observational resources as well as advanced stellar atmosphere modelling, ta
Autor:
Melissa Ness, Jonathan P. Clarke, Kenneth C. Freeman, Shola M. Wylie, Ortwin Gerhard, Joss Bland-Hawthorn
Publikováno v:
Astronomy & Astrophysics. 653:A143
We use the data-driven method, The Cannon, to bring 21,000 stars from the ARGOS bulge survey, including 10,000 red clump stars, onto the parameter and abundance scales of the cross-Galactic survey, APOGEE, obtaining rms precisions of 0.10 dex, 0.07 d
Autor:
Aldo F. M. Fiorenzano, Andrea Bignamini, A. F. Lanza, Gaetano Scandariato, Luca Fossati, Valerio Nascimbeni, Cristina Knapic, Emilio Molinari, M. P. Di Mauro, M. Esposito, Antonio Maggio, Aldo S. Bonomo, Matteo Brogi, Walter Boschin, Monica Rainer, R. G. Gratton, Marco Pedani, Serena Benatti, Alessandro Sozzetti, Giuseppina Micela, Jesus Maldonado, Avet Harutyunyan, Giampaolo Piotto, Isabella Pagano, I. Raspantini, L. Pino, G. Frustagli, Elvira Covino, Daniela Sicilia, Francesco Borsa, Riccardo Claudi, Luigi Mancini, Rosario Cosentino, L. Di Fabrizio, Silvano Desidera, Ennio Poretti
Publikováno v:
Astronomy & Astrophysics. 653:A104
Context. Giant planets in short-period orbits around bright stars represent optimal candidates for atmospheric and dynamical studies of exoplanetary systems. Aims. We aim to analyse four transits of WASP-33b observed with the optical high-resolution
Autor:
Samir Salim, Médéric Boquien
Publikováno v:
Astronomy & Astrophysics. 653:A149
The IR emission of dust heated by stars provides critical information for galaxy evolution studies. Unfortunately, observations are often limited to the MIR, making templates a necessity. Previously published templates were based on small samples of
Publikováno v:
Astronomy & Astrophysics, 653:A21. EDP Sciences
Astronomy & Astrophysics, 653, 1-12
Astronomy & Astrophysics, 653, 1-12
The infrared signature of polycyclic aromatic hydrocarbons (PAHs) are present in many protostellar disks and these speciesare thought to play an important role in heating of the gas in the photosphere. We aim to consider PAH cluster formation as one