The periodicity of the η Carinae events
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and well-defined period. We have combi...
| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2008
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84324 |
| Aporte de: |
| id |
I19-R120-10915-84324 |
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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 |
Ciencias Astronómicas Stars: binary Stars: general Stars: individual: eta Carinae |
| spellingShingle |
Ciencias Astronómicas Stars: binary Stars: general Stars: individual: eta Carinae Damineli, A. Hillier, D. J. Corcoran, M. F. Stahl, O. Levenhagen, R. S. Leister, N. V. Groh, J. H. Teodoro, M. Albacete Colombo, Juan Facundo Gonzalez, F. Arias, Julia Inés Levato, Orlando Hugo Grosso, M. Morrell, Nidia Irene Gamen, Roberto Claudio Wallerstein, G. Niemelä, Virpi Sinikka The periodicity of the η Carinae events |
| topic_facet |
Ciencias Astronómicas Stars: binary Stars: general Stars: individual: eta Carinae |
| description |
Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and well-defined period. We have combined the cycle lengths derived from the many lines in the optical spectrum with those from broad-band X-rays, optical and near-infrared observations, and obtained a period length of P<SUB>pres</SUB> = 2022.7 ± 1.3 d.
Spectroscopic data collected during the last 60 yr yield an average period of P<SUB>avg</SUB> = 2020 ± 4 d, consistent with the present-day period. The period cannot have changed by more than ΔP/P = 0.0007 since 1948. This confirms the previous claims of a true, stable periodicity, and gives strong support to the binary scenario. We have used the disappearance of the narrow component of He I 6678 to define the epoch of the Cycle 11 minimum, T<SUB>0</SUB> = JD 245 2819.8. The next event is predicted to occur on 2009 January 11 (±2 d). The dates for the start of the minimum in other spectral features and broad-bands are very close to this date, and have well-determined time-delays from the He I epoch. |
| format |
Articulo Articulo |
| author |
Damineli, A. Hillier, D. J. Corcoran, M. F. Stahl, O. Levenhagen, R. S. Leister, N. V. Groh, J. H. Teodoro, M. Albacete Colombo, Juan Facundo Gonzalez, F. Arias, Julia Inés Levato, Orlando Hugo Grosso, M. Morrell, Nidia Irene Gamen, Roberto Claudio Wallerstein, G. Niemelä, Virpi Sinikka |
| author_facet |
Damineli, A. Hillier, D. J. Corcoran, M. F. Stahl, O. Levenhagen, R. S. Leister, N. V. Groh, J. H. Teodoro, M. Albacete Colombo, Juan Facundo Gonzalez, F. Arias, Julia Inés Levato, Orlando Hugo Grosso, M. Morrell, Nidia Irene Gamen, Roberto Claudio Wallerstein, G. Niemelä, Virpi Sinikka |
| author_sort |
Damineli, A. |
| title |
The periodicity of the η Carinae events |
| title_short |
The periodicity of the η Carinae events |
| title_full |
The periodicity of the η Carinae events |
| title_fullStr |
The periodicity of the η Carinae events |
| title_full_unstemmed |
The periodicity of the η Carinae events |
| title_sort |
periodicity of the η carinae events |
| publishDate |
2008 |
| url |
http://sedici.unlp.edu.ar/handle/10915/84324 |
| work_keys_str_mv |
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Repositorios |
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