Výsledky vyhledávání - "A. E. Ringuelet"

Autor: Juan Zorec, María Laura Arias, D. Ballereau, Nidia Morrell, Lydia Sonia Cidale, Adela E. Ringuelet

Publikováno v: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP

Aims. The Fe II emission lines formed in the circumstellar envelopes (CE) of classical Be stars are studied in order to determine whether they are optically thin or optically thick. We also aim at deriving both average Fe II line excitation temperatu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::43f293c7848428a9e9dab75e68edd567
https://doi.org/10.1051/0004-6361:20065160

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The circumstellar environment of the star V923 Aquilae

Autor: María Laura Arias, Lydia Sonia Cidale, Adela E. Ringuelet

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

V923 Aquilae is a Be shell star that displays emission in Hα, cyclic V/R variations and variations in the intensity of the near infrared continuum. The star presents radial velocity variations arising from a superposition of a long-term cycle and an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa35046c0bbef3029d8efcd35bbfa178
https://doi.org/10.1051/0004-6361:20034435

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Atmospheric models of He-peculiar stars: synthetic He I line profiles and absolute visual magnitudes

Autor: Adela E. Ringuelet, René D. Rohrmann, Lydia Sonia Cidale, R. Vallverdú

Publikováno v: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP

We analyze the influence of magnetic pressure effects on the atmospheric structure of B peculiar type stars, as well as, on the emergent He I line profiles and absolute visual magnitudes. We consider a photosphere in local thermodynamic and hydrostat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ba6cf2801f635ba871a03975fa030594
https://link.springer.com/article/10.1007/s10509-014-1886-y

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Analysis of the Siiiand SiiiiDR Processes Applied to Stellar Envelopes

Autor: A. Cruzado, Héctor O. Di Rocco, Adela E. Ringuelet

Publikováno v: The Astrophysical Journal. 554:571-577

In an earlier attempt to explain the observed excess in the IR flux of Be stars, we have analyzed the dielectronic recombination (DR) of Mg II in stellar envelopes and the influence of this atomic process on the stellar flux. In the present paper, we

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5fed8e681b223462e796ffe1a5866b49
https://doi.org/10.1086/321375

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Influence of the Plasma Opacity in the Calculations of IR Emission Due to Dielectronic Recombination of Mg II

Autor: Adela E. Ringuelet, A. Cruzado

Publikováno v: International Astronomical Union Colloquium. 175:488-491

In an earlier work (Cruzado, Di Rocco & Ringuelet, 1998), we showed that the dielectronic recombination of Mg II atoms contributes strongly to the infrared flux. In the present paper we aim at investigating whether the approximations made before coul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2c17bd215f77416f4d6ef2682f247d4c
https://doi.org/10.1017/s0252921100056323

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Dielectronic Recombination of Mgiiin Stellar Envelopes

Autor: Adela E. Ringuelet, A. Cruzado, Héctor O. Di Rocco

Publikováno v: SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP

The aim of the present paper is to discuss the significance, in the infrared continuum of Be stars, of the dielectronic recombination (DR) of Mg II atoms. To accomplish this, we hace calculated the emissitivity in the lines of Mg I atoms after the pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa00cdb4ede4bb839634910c1d7943ae
https://doi.org/10.1086/306004

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3 Puppis: a peculiar object with infrared excess

Autor: A. C. Rovero, Adela E. Ringuelet

Publikováno v: Monthly Notices of the Royal Astronomical Society. 266:203-211

We present a model that accounts for the UV, photographic and IR observations of 3 Puppis. The model consists of a binary system in which the primary is an A supergiant with a mild chromosphere; the primary fills its Roche lobe. The velocity law in t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff215a372c2414f8f9f6e7026f7181b8
https://doi.org/10.1093/mnras/266.1.203

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Semi-empirical Model of the Star V923 Aquilae

Autor: A. E. Ringuelet, L. S. Cidale, M. L. Arias

Publikováno v: International Astronomical Union Colloquium. 175:547-549

V923 Aquilae (HD 183656) is a Be star which shows emission in Hα, cyclic V/R variations and variations in the near infrared region. This star displays a shell spectrum recognized by Harper(1937) and Bidelman (1950) who both remarked the presence of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::59613c0136023b4d8fb06bd970d4d8ce
https://doi.org/10.1017/s0252921100056475

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Be star disc characteristics near the central object

Autor: María Laura Arias, Juan Zorec, Adela E. Ringuelet, Lydia Sonia Cidale

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

Context. A recent analysis of visual Fell emission lines of 17 classic Be stars using the self-absorption curve (SAC) method revealed that these lines are optically thick and that they form in circumstellar disc (CD) regions within two stellar radii

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::853ced85aa861b022f4a9d169ec51769
https://www.aanda.org/articles/aa/abs/2007/28/aa6615-06/aa6615-06.html

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Constraints on the wind structure of OB stars from theoretical He II lines

Autor: Lydia Sonia Cidale, Adela E. Ringuelet, R. O. J. Venero

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

Theoretical profiles of He II lines in OB stars with an expanding, spherically symmetric atmosphere are computed. The extended atmospheric model is formed by a classical photosphere, characterized by the effective temperature and the surface gravity,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9fcf7d7f5a9cb60d361bc1e7453149a7
http://sedici.unlp.edu.ar/handle/10915/84900

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