XMM-Newton observations of RR Telescopii: evidence for wind signatures and shocked gas emission
Entity
UAM. Departamento de Física TeóricaPublisher
ESODate
2013-08-01Citation
10.1051/0004-6361/201321358
Astronomy and Astrophysics 556 (2013): A85
ISSN
0004-6361(print); 1432-0746 (online)DOI
10.1051/0004-6361/201321358Funded by
Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.Editor's Version
http://dx.doi.org/10.1051/0004-6361/201321358Subjects
Binaries: symbiotic; Stars: individual: RR Telescopii; X-rays: binaries; FísicaNote
Astronomy and Astrophysics 556 (2013): A85 reproduced with permission from Astronomy & AstrophysicsRights
© 2013 ESO.Abstract
RR Telescopii is the prototype of the symbiotic novae class. Since its outburst in 1944, it has been slowly fading, and its emission-line spectrum has evolved significantly. In this paper we discuss XMM-Newton observations of RR Tel taken in April 2009. These are the first X-ray high-resolution spectra of this system, and they provide important information about the physical conditions of the emitting gas. We have estimated the temperature and the luminosity of the hot star to be 154 kK and 5000 L•, respectively, from the comparison of model atmospheres with the X-ray spectra. Normalisation of the models with the far ultraviolet flux leads to similar values. Both the shape of the low-resolution X-ray spectrum and the spectral diagnostics that make use of the emission lines present in the RGS spectrum indicate the existence of collisionally ionised gas. At least two components are present, with temperatures of ≈0.6 and 1.7 MK. The existence of a wind from the hot star is unequivocally confirmed by HST-STIS observations taken in 2000, which showed displaced absorption components for the N V 1240 Å and C IV 1550 Å doublets. These components have terminal velocities of the order of 400 km s-1, which is consistent with the temperature of the gas detected in X-rays.
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Google Scholar:González-Riestra, Rosario
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Selvelli, Pierluigi Luigi
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Cassatella, Angelo
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