Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...627l..49k&link_type=abstract
The Astrophysical Journal, Volume 627, Issue 1, pp. L49-L52.
Astronomy and Astrophysics
Astronomy
18
Astrometry, Stars: Agb And Post-Agb, Stars: Individual: Constellation Name: Ux Cygni, Techniques: Interferometric
Scientific paper
We have measured the annual parallax of the Mira-type variable star UX Cyg at ϖ=0.54+/-0.06 mas from phase-referencing VLBI observations of its circumstellar water masers with the VLBA. The corresponding distance is 1.85+0.25-0.19 kpc. This is the first measurement of an annual parallax based on observations of water masers. It is important to calibrate the period-luminosity relation of Mira variables because it is an important distance indicator in astronomy. We discuss the distance to the Large Magellanic Cloud by comparing our results with the period-luminosity relation in the Large Magellanic Cloud. We obtained the three-dimensional position and velocity of UX Cyg in our Galaxy: (R,θ,z)=(8.20+/-0.01 kpc, 12.4d+1.7d-1.3d, -0.30+0.03-0.04 kpc), (VR,Vθ,Vz)=(-81.6+14.0-15.3, 204.0+3.6-3.4, -12.1+10.2-10.3) km s-1. We also discuss the origin of UX Cyg.
Kobayashi Hideyuki
Kurayama Tomoharu
Sasao Tetsuo
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