Astrometry of OH/IR Stars Using 1612MHz Hydroxyl Masers. I. Annual Parallaxes of WX Psc and OH138.0+7.2 MEConference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, JUL 28-AUG
Artikel i vetenskaplig tidskrift, 2017
We report on the measurement of the trigonometric parallaxes of 1612 MHz hydroxyl masers around two asymptotic giant branch stars, WX. Psc and OH. 138.0+7.2, using the NRAO Very Long Baseline Array with in-beam phase referencing calibration. We obtain a 3s upper limit of. <= 5.3 mas on the parallax of WX. Psc, corresponding to a lower limit distance estimate of. 190 pc. The obtained parallax of OH. 138.0+7.2 is 0.52 +/- 0.09 mas (+/- 18%), corresponding to a distance of 1.9(-0.3)(+0.4)kpc, making this the first hydroxyl maser parallax below one milliarcsecond. We also introduce a new method of error analysis for detecting systematic errors in the astrometry. Finally, we compare our trigonometric distances to published phase-lag distances toward these stars and find a good agreement between the two methods.
vera
correlator
proper motions
distance
masers
stars: individual (WX Psc
agb stars
pulsars
stars: AGB and post-AGB
circumstellar oh masers
vlbi astrometry
OH 138.0+7.2)
techniques:
Astronomy & Astrophysics
astrometry
software
h2o masers
Författare
G. Orosz
Kagoshima University
H. Imai
Kagoshima University
R. Dodson
University of Western Australia
M. J. Rioja
Observatorio Astronómico Nacional (OAN)
CSIRO Astronomy and Space Science
University of Western Australia
S. Frey
Magyar Tudomanyos Akademia
R. A. Burns
Joint Institute for VLBI in Europe (JIVE)
Kagoshima University
S. Etoka
Universität Hamburg
A. Nakagawa
Kagoshima University
H. Nakanishi
JAXA Institute of Space and Astronautical Science
SKA Organisation
Kagoshima University
Y. Asaki
National Institutes of Natural Sciences
Atacama Large Millimeter-submillimeter Array (ALMA)
S. R. Goldman
Keele University
Daniel Tafoya Martinez
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
Astronomical Journal
0004-6256 (ISSN) 1538-3881 (eISSN)
Vol. 153 3 119-Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
Infrastruktur
Onsala rymdobservatorium
DOI
10.3847/1538-3881/153/3/119