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| Título: | A multispectral view of the periodic events in Eta Carinae |
| Autor(es): | Damineli, A. Hillier, D. J. Corcoran, Michael Stahl, O. Groh, J. H. Arias, Julia I. Teodoro, M. Morrell, Nidia I. Gamen, Roberto C. Gonzalez, Jorge F. Leister, N. V. Levato, Orlando H. Levenhagen, R. S. Grosso, Monica G. Albacete Colombo, Juan Facundo Wallerstein, G. |
| Fecha de publicación: | jun-2008 |
| Editorial: | Journal compilation |
| Citación: | Damineli, A.; Hillier, D. J., Corcoran, Michael; Stahl, O, ....& Groh, J. H.(2008). A multispectral view of the periodic events in Eta Carinae. Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 386; 4; 6-2008; 2330-2344 |
| Revista: | Monthly Notices of the Royal Astronomical Society |
| Resumen: | 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). |
| URI: | https://academic.oup.com/mnras/article/386/4/2330/1468103 https://rid.unrn.edu.ar/jspui/handle/20.500.12049/2499 |
| ISSN: | 1365-2966 0035-8711 |
| Otros enlaces: | http://dx.doi.org/10.1111/j.1365-2966.2008.13214.x |
| Aparece en las colecciones: | Artículos |
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| Archivo | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| RID-UNRN_A.pdf | 415,42 kB | Adobe PDF | Visualizar/Abrir |
Este documento es resultado del financiamiento otorgado por el Estado Nacional, por lo tanto queda sujeto al cumplimiento de la Ley N° 26.899
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