| Full text | |
| Author(s): |
Silva, K. M. G.
[1]
;
Rodrigues, C. V.
[1]
;
Costa, J. E. R.
[1]
;
de Souza, C. A.
[1]
;
Cieslinski, D.
[1]
;
Hickel, G. R.
[2]
Total Authors: 6
|
| Affiliation: | [1] Inst Nacl Pesquisas Espaciais MCT, BR-12227010 Sao Jose Dos Campos, SP - Brazil
[2] Univ Vale Paraiba, Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 432, n. 2, p. 1587-1599, JUN 2013. |
| Web of Science Citations: | 5 |
| Abstract | |
The viewing geometry of the polar CP Tuc that better explains its optical and X-ray light curves is controversial. Previous modelling of white-light polarimetric data considered the partial self-eclipse of an extended inhomogeneous emitting region. Alternatively, phase-dependent absorption has been used to reproduce the X-ray data. This paper presents new optical polarimetric data of CP Tuc and a model that consistently explains its optical and X-ray data. The model was based on an extension of the cyclops code that added X-ray bremsstrahlung emission and pre-shock region absorption to the original version, which only accounted for cyclotron emission. The new code creates the possibility of simultaneous optical and X-ray fitting. We show that self-eclipse and absorption data have distinct signatures on the X-ray spectra. Although we were able to reasonably fit the CP Tuc optical data to cases of absorption and self-eclipse, we were only able to reproduce the X-ray orbital modulation after considering the absorption in the pre-shock region. Specifically, we were unable to reproduce the X-ray observations in the self-eclipse case. We found that the primary emitting region in CP Tuc is located near the rotation pole that approximately points to the observer. (AU) | |
| FAPESP's process: | 10/01584-8 - SPARC4: simultaneous polarimeter and rapid camera in four bands |
| Grantee: | Cláudia Vilega Rodrigues |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 08/09619-5 - MULTIWAVELENGTH MODELLING OF THE ACCRETION REGION IN POLARS |
| Grantee: | Karleyne Medeiros Gomes da Silva |
| Support Opportunities: | Scholarships in Brazil - Doctorate |