Query : 2012A&A...547A..45S

2012A&A...547A..45S - Astronomy and Astrophysics, volume 547A, 45-45 (2012/11-1)

Measuring the orbital inclination of z Andromedae from Rayleigh scattering.


Abstract (from CDS):

The orbital inclination of the symbiotic prototype Z And has not been established yet. At present, two very different values are considered, i∼44° and i>73°. The correct value of i is a key parameter in, for example, modeling the highly-collimated jets of Z And. 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 φ=0.961±0.018. Second, we calculate nH as a function of i and φ for the ionization structure during the quiescent phase. Third, we compare the nH(i,φ) 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°. Systematic errors given by using different wind velocity laws can increase i up to ∼74°. A high value of i is supported independently by the orbitally related variation in the far-UV continuum and the obscuration of the OI]λ1641Å 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 Hα and Hβ emission lines as highly-collimated jets.

Abstract Copyright:

Journal keyword(s): binaries: symbiotic - scattering - stars: individual: Z And

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 V* EG And Sy* 00 44 37.1873792808 +40 40 45.704829252 10.54 8.93 7.22     M2.4III 278 0
2 V* SY Mus Sy* 11 32 09.9955543536 -65 25 11.458124364   11.97 10.20     M4 160 0
3 V* RW Hya Sy* 13 34 18.1289607744 -25 22 48.881433972   11.51 10.00     M1/2IIIe 192 0
4 V* AG Dra Sy* 16 01 41.0120557968 +66 48 10.135056672 11.50 11.06 9.74 8.52   K3IIIep 491 0
5 V* Z And Sy* 23 33 39.9553225728 +48 49 05.974867308 8.86 9.35 8.00     M2III+B1eq 514 0

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