Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. annual parallaxes of WX Psc and OH138.0+7.2

G. Orosz, H. Imai, R. Dodson, Maria J. Rioja , S. Frey, R. A. Burns, S. Etoka, A. Nakagawa, H. Nakanishi, Y. Asaki, S. R. Goldman, D. Tafoya

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Abstract

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 3σ 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, 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.

Original languageEnglish
Article number119
Number of pages13
JournalAstronomical Journal
Volume153
Issue number3
DOIs
Publication statusPublished - 1 Mar 2017

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astrometry
masers
parallax
stars
error analysis
Very Long Baseline Array (VLBA)
calibration
asymptotic giant branch stars
systematic errors
time lag
method
estimates

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Orosz, G. ; Imai, H. ; Dodson, R. ; Rioja , Maria J. ; Frey, S. ; Burns, R. A. ; Etoka, S. ; Nakagawa, A. ; Nakanishi, H. ; Asaki, Y. ; Goldman, S. R. ; Tafoya, D. / Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. annual parallaxes of WX Psc and OH138.0+7.2. In: Astronomical Journal. 2017 ; Vol. 153, No. 3.
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abstract = "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 3σ 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, 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.",
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Orosz, G, Imai, H, Dodson, R, Rioja , MJ, Frey, S, Burns, RA, Etoka, S, Nakagawa, A, Nakanishi, H, Asaki, Y, Goldman, SR & Tafoya, D 2017, 'Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. annual parallaxes of WX Psc and OH138.0+7.2' Astronomical Journal, vol. 153, no. 3, 119. https://doi.org/10.3847/1538-3881/153/3/119

Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. annual parallaxes of WX Psc and OH138.0+7.2. / Orosz, G.; Imai, H.; Dodson, R.; Rioja , Maria J.; Frey, S.; Burns, R. A.; Etoka, S.; Nakagawa, A.; Nakanishi, H.; Asaki, Y.; Goldman, S. R.; Tafoya, D.

In: Astronomical Journal, Vol. 153, No. 3, 119, 01.03.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Astrometry of OH/IR stars using 1612 MHz hydroxyl masers. I. annual parallaxes of WX Psc and OH138.0+7.2

AU - Orosz, G.

AU - Imai, H.

AU - Dodson, R.

AU - Rioja , Maria J.

AU - Frey, S.

AU - Burns, R. A.

AU - Etoka, S.

AU - Nakagawa, A.

AU - Nakanishi, H.

AU - Asaki, Y.

AU - Goldman, S. R.

AU - Tafoya, D.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - 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 3σ 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, 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.

AB - 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 3σ 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, 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.

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KW - masers

KW - stars: AGB and post-AGB

KW - stars: individual (WX Psc, OH 138.0+7.2)

KW - techniques: interferometric

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DO - 10.3847/1538-3881/153/3/119

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JO - The Astronomical Journal

JF - The Astronomical Journal

SN - 0004-6256

IS - 3

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