Measuring the orbital inclination of Z Andromedae from Rayleigh scattering

The orbital inclination of the symbiotic prototype Z And has not been established yet. At present, two very different values are considered, ... and ... . The authors aim is to measure the orbital inclination of Z Andromedae. First, they derive the hydrogen column density (n sub( H)), which causes t...

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Published in:Astronomy and astrophysics (Berlin) 2012-11, Vol.547, p.1-1
Main Authors: Skopal, A, Shagatova, N
Format: Article
Language:English
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Summary:The orbital inclination of the symbiotic prototype Z And has not been established yet. At present, two very different values are considered, ... and ... . The authors aim is to measure the orbital inclination of Z Andromedae. First, they derive the hydrogen column density (n sub( H)), which causes the Rayleigh scattering of the far-UV spectrum at the orbital phase [empty_set] = 0.961 +mr 0.018. Second, they calculate n sub( H) as a function of i and [empty_set] for the ionization structure during the quiescent phase. Third, they compare the n sub( H) models with the observed value. The most probable shaping of the HI/HIIboundaries and the uncertainties in the orbital phase limit i of Z Andromedae to ... . Systematic errors given by using different wind velocity laws can increase i up to similar 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 lambda 1641 Aa emission line around the inferior conjunction of the giant. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0004-6361
1432-0746