Be and Bn stars: Balmer discontinuity and stellar-class relationship

Autor: Anahí Granada, Y. R. Cochetti, Juan Zorec, M. L. Arias, Lydia Sonia Cidale, Yves Fremat, Y. Aidelman, Andrea Fabiana Torres

Publikováno v: RID-UNRN (UNRN)
Universidad Nacional de Río Negro
instacron:UNRN
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET

A significant number of Be stars show a second Balmer discontinuity (sBD) attributed to an extended circumstellar envelope (CE). The fast rotational velocity of Be stars undoubtedly plays a significant role in the formation of the CE. However, Bn sta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a71d9ac6a3f565c65be5fe47298319db
https://doi.org/10.1051/0004-6361/201936444

A search for peculiar stars in the open cluster Hogg 16

Autor: Ernst Paunzen, Martin Netopil, Lýdia Stofanová, Petr Kurfürst, Olga Pintado, Y. Aidelman, Stefano Cariddi, Naira M. Azatyan

The study of chemically peculiar (CP) stars in open clusters provides valuable information about their evolutionary status. Their detection can be performed using the $\Delta a$ photometric system, which maps a characteristic flux depression at $\lam

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8191c16ba4823811a80151f4b881c27d
http://hdl.handle.net/11577/3260126

Critical study of the distribution of rotational velocities of Be stars

Autor: J. Zorec, Lydia Sonia Cidale, Ch. Martayan, Frédéric Royer, Y. Aidelman, A. Domiciano de Souza, Yves Fremat, P. Stee, Y. R. Cochetti, T. Semaan, A. M. Hubert, María Laura Arias

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2017, 602, pp.A83. ⟨10.1051/0004-6361/201628761⟩
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 602, pp.A83. ⟨10.1051/0004-6361/201628761⟩

We assume that stars may undergo surface differential rotation to study its impact on the interpretation of $V\!\sin i$ and on the observed distribution $\Phi(u)$ of ratios of true rotational velocities $u=V/V_\rm c$ ($V_\rm c$ is the equatorial crit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c1563d98e2ce561bfc8fdaf7930c363

Critical study of the distribution of rotational velocities of Be stars: I. Deconvolution methods, effects due to gravity darkening, macroturbulence, and binarity

Autor: T. Semaan, A. Domiciano de Souza, Juan Zorec, Ch. Martayan, M. L. Arias, P. Stee, Y. R. Cochetti, Yves Fremat, Lydia Sonia Cidale, Frédéric Royer, A. M. Hubert, Y. Aidelman

Publikováno v: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET

Context. Among intermediate-mass and massive stars, Be stars are the fastest rotators in the main sequence (MS) and, as such, these stars are a cornerstone to validate models of structure and evolution of rotating stars. Several phenomena, however, i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebe88af528aec77ed51b333653c30f66
http://sedici.unlp.edu.ar/handle/10915/85970

Open clusters. II. Fundamental parameters of B stars in Collinder 223, Hogg 16, NGC 2645, NGC 3114, and NGC 6025

Autor: J. Zorec, Lydia Sonia Cidale, Y. Aidelman, Jorge Alejandro Panei

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2015, 577, ⟨10.1051/0004-6361/201425085⟩
CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP

The knowledge of accurate values of effective temperature, surface gravity, and luminosity of stars in open clusters is very important not only to derive cluster distances and ages but also to discuss the stellar structure and evolution. Unfortunatel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8818ef559f9eab1884f5b86437c7bdd9
https://insu.hal.science/insu-03644967/file/aa25085-14.pdf