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| DOI | 10.1051/0004-6361/200911750 | ||||
| Año | 2009 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Accretion shocks have been recognized as an important X-ray emission mechanism for pre-main sequence stars, and yet the X-ray properties of FUor outbursts, events that are caused by violent accretion, have been given little attention. We observed the FUor object ZCMa during optical outburst and quiescence with Chandra. No significant changes in X-ray brightness and spectral shape were found, suggesting that the X-ray emission is coronal. The binary nature of ZCMa makes the origin of the X-ray source ambiguous. However, the moderate hydrogen column density derived from our data makes it unlikely that the embedded primary star is the Xray source. The secondary star, which is the FUor object, is thus responsible for both the X-ray emission and the ongoing accretion outburst, which seem, however, to be unrelated phenomena. The secondary is also known to drive a large outflow and jet, which we detect here for the first time in X-rays. The distance of the X-ray emitting outflow source to the central star is greater than in jets of low-mass stars.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Stenzel, H. | Mujer |
INAF Osservatorio Astron Palermo - Italia
Osservatorio Astronomico di Palermo Guiseppe S. Vaiana - Italia Osservatorio Astronomico di Palermo “Giuseppe S. Vaiana” - Italia |
| 2 | Hubrig, Swetlana | Mujer |
ESO - Chile
European Southern Observatory Santiago - Chile Observatorio Europeo Austral - Alemania Observatorio Europeo Austral - Chile |
| 3 | Orlando, Salvatore | Hombre |
INAF Osservatorio Astron Palermo - Italia
Osservatorio Astronomico di Palermo Guiseppe S. Vaiana - Italia Osservatorio Astronomico di Palermo “Giuseppe S. Vaiana” - Italia |
| 4 | Micela, G. | Mujer |
INAF Osservatorio Astron Palermo - Italia
Osservatorio Astronomico di Palermo Guiseppe S. Vaiana - Italia Osservatorio Astronomico di Palermo “Giuseppe S. Vaiana” - Italia |
| 5 | Mikulasek, Zdenek | Hombre |
Masaryk Univ - República Checa
Tech Univ Ostrava - República Checa Masaryk University - República Checa VSB – Technical University of Ostrava - República Checa |
| 6 | Schoeller, Markus | Hombre |
ESO - Alemania
Observatorio Europeo Austral - Alemania |