Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasj...63...81i&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.63, No.1, pp.81--87
Astronomy and Astrophysics
Astronomy
1
Masers, Stars: Agb And Post-Agb, Stars: Individual (Iras 19312+1950)
Scientific paper
We report on results of astrometric observations of H2O masers in the pre-planetary nebula candidate source IRAS 19312-1950 with the VLBI Exploration of Radio Astrometry (VERA), yielding an annual parallax, π = 263±47μas, and a secular motion, (μα, μδ) = (-2.61±0.47, -6.73±0.14) [mas yr-1], for IRAS 19312+1950. We then derived a heliocentric distance of D = 3.80+0.83-0.58 kpc, a location in the Galaxy (R, z) = (7.07±0.12kpc, 28±3pc), and a three-dimensional velocity vector (VR, Vθ, Vz) = (33±28, 214±4, -14±8) [km s-1] in galactic cylindrical coordinates. Based on these parameters, we discuss the intrinsic properties of IRAS 19312+1950. We estimated the mass of the central star to be ˜8Modot and the deviation of the source motion from the circular galactic rotation to be ˜40km s-1. These are consistent with this source being an intermediate-mass late AGB or early post-AGB star.
Hirota Tomoya
Honma Mareki
Imai Hiroshi
Miyaji Takeshi
Tafoya Daniel
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