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Measuring the orbital inclination of Z Andromedae from Rayleigh scattering | | A. Skopal
; N. Shagatova
; | | Date: |
21 Oct 2012 | | Abstract: | The orbital inclination of the symbiotic prototype Z And has not been
established yet. At present, two very different values are considered, i ~ 44
degrees and i >~ 73 degrees. The correct value of i is a key parameter in, for
example, modeling the highly-collimated jets of Z And. The aim of this paper is
to measure the orbital inclination of Z And. First, we derive the hydrogen
column density (nH), which causes the Rayleigh scattering of the far-UV
spectrum at the orbital phase phi = 0.961 plus/minus 0.018. Second, we
calculate nH as a function of i and phi for the ionization structure during the
quiescent phase. Third, we compare the nH(i,phi) models with the observed
value. The most probable shaping of the HI/HII boundaries and the uncertainties
in the orbital phase limit i of Z And to 59 -2/+3 degrees. Systematic errors
given by using different wind velocity laws can increase i up to ~74 degrees. A
high value of i is supported independently by the orbitally related variation
in the far-UV continuum and the obscuration of the OI] 1641 A emission line
around the inferior conjunction of the giant. The derived value of the
inclination of the Z And orbital plane allows treating satellite components of
H-alpha and H-beta emission lines as highly-collimated jets. | | Source: | arXiv, 1210.5760 | | Services: | Forum | Review | PDF | Favorites | |
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