A multispectral view of the periodic events in Eta Carinae
A full description of the 5.5-yr low excitation events in η Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first, the slow variation component, is revealed by slow changes in the ionization level of circumstellar ma...
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2008
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/93871 https://academic.oup.com/mnras/article/386/4/2330/1468103 |
| Aporte de: |
| id |
I19-R120-10915-93871 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía Stars Eta Carinae |
| spellingShingle |
Astronomía Stars Eta Carinae Damineli, A. Hillier, D. J. Corcoran, Michael Stahl, O. Groh, J. H. Arias, Julia Inés Teodoro, M. Morrell, Nidia Irene Gamen, Roberto Claudio González, Jorge Federico Leister, N. V. Levato, Orlando Hugo Levenhagen, R. S. Grosso, Mónica Gladys Albacete Colombo, Juan Facundo Wallerstein, G. A multispectral view of the periodic events in Eta Carinae |
| topic_facet |
Astronomía Stars Eta Carinae |
| description |
A full description of the 5.5-yr low excitation events in η Carinae is presented. We show that they are not as simple and brief as previously thought, but a combination of two components. The first, the slow variation component, is revealed by slow changes in the ionization level of circumstellar matter across the whole cycle and is caused by gradual changes in the wind– wind collision shock-cone orientation, angular opening and gaseous content. The second, the collapse component, is restricted to around the minimum, and is due to a temporary global collapse of the wind–wind collision shock. High-energy photons (E > 16 eV) from the companion star are strongly shielded, leaving the Weigelt objects at low-ionization state for more than six months. High-energy phenomena are sensitive only to the collapse, low energy only to the slow variation and intermediate energies to both components. Simple eclipses and mechanisms effective only near periastron (e.g. shell ejection or accretion on to the secondary star) cannot account for the whole 5.5-yr cycle. We find anti-correlated changes in the intensity and the radial velocity of P Cygni absorption profiles in Fe II λ6455 and He I λ7065 lines, indicating that the former is associated to the primary and the latter to the secondary star. We present a set of light curves representative of the whole spectrum, useful for monitoring the next event (2009 January 11). |
| format |
Articulo Articulo |
| author |
Damineli, A. Hillier, D. J. Corcoran, Michael Stahl, O. Groh, J. H. Arias, Julia Inés Teodoro, M. Morrell, Nidia Irene Gamen, Roberto Claudio González, Jorge Federico Leister, N. V. Levato, Orlando Hugo Levenhagen, R. S. Grosso, Mónica Gladys Albacete Colombo, Juan Facundo Wallerstein, G. |
| author_facet |
Damineli, A. Hillier, D. J. Corcoran, Michael Stahl, O. Groh, J. H. Arias, Julia Inés Teodoro, M. Morrell, Nidia Irene Gamen, Roberto Claudio González, Jorge Federico Leister, N. V. Levato, Orlando Hugo Levenhagen, R. S. Grosso, Mónica Gladys Albacete Colombo, Juan Facundo Wallerstein, G. |
| author_sort |
Damineli, A. |
| title |
A multispectral view of the periodic events in Eta Carinae |
| title_short |
A multispectral view of the periodic events in Eta Carinae |
| title_full |
A multispectral view of the periodic events in Eta Carinae |
| title_fullStr |
A multispectral view of the periodic events in Eta Carinae |
| title_full_unstemmed |
A multispectral view of the periodic events in Eta Carinae |
| title_sort |
multispectral view of the periodic events in eta carinae |
| publishDate |
2008 |
| url |
http://sedici.unlp.edu.ar/handle/10915/93871 https://academic.oup.com/mnras/article/386/4/2330/1468103 |
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Repositorios |
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