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
Journal article, 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.

techniques:

Astronomy & Astrophysics

masers

agb stars

circumstellar oh masers

correlator

vera

proper motions

astrometry

pulsars

software

distance

OH 138.0+7.2)

stars: AGB and post-AGB

vlbi astrometry

h2o masers

stars: individual (WX Psc

Author

G. Orosz

Kagoshima University

H. Imai

Kagoshima University

R. Dodson

University of Western Australia

M. J. Rioja

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

University of Western Australia

Spanish National Observatory (OAN)

S. Frey

Hungarian Academy of Sciences

R. A. Burns

Kagoshima University

Joint Institute for VLBI in Europe (JIVE)

S. Etoka

University of Hamburg

A. Nakagawa

Kagoshima University

H. Nakanishi

Kagoshima University

JAXA Institute of Space and Astronautical Science

SKA Organisation

Y. Asaki

Atacama Large Millimeter-submillimeter Array (ALMA)

National Institutes of Natural Sciences

S. R. Goldman

Keele University

Daniel Tafoya Martinez

Chalmers, Earth and Space Sciences, Onsala Space Observatory

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 153 3 119- 119

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

Infrastructure

Onsala Space Observatory

DOI

10.3847/1538-3881/153/3/119

More information

Latest update

10/10/2023