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Properties of pulsating OH/IR stars revealed from astrometric VLBI observation

Published online by Cambridge University Press:  07 February 2024

Akiharu Nakagawa Open the ORCID record for Akiharu Nakagawa [Opens in a new window] ,
Tomoharu Kurayama ,
Hiroshi Sudou  and
Gabor Orosz Open the ORCID record for Gabor Orosz [Opens in a new window]
Akiharu Nakagawa*
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan.
Tomoharu Kurayama
Affiliation:
Teikyo University of Science, 2-2-1 Senju-Sakuragi, Adachi-ku, Tokyo 120-0045, Japan
Hiroshi Sudou
Affiliation:
Department of General Engineering, National Institute of Technology, Sendai College, Natori Campus, 48 Nodayama, Medeshima-Shiote, Natori-shi, Miyagi 981-1239, Japan
Gabor Orosz
Affiliation:
Joint Institute for VLBI ERIC (JIVE), Oude Hoogeveensedijk 4, 7991 PD, Dwingeloo, Netherlands
*
email: nakagawa@sci.kagoshima-u.ac.jp
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Abstract

We aim to reveal properties of evolution stages in AGB phase; Mira, OH/IR stars, and non-variable OH/IR stars. We presented results of our VLBI observations of four stars; NSV17351, OH39.7+1.5, IRC–30363, and AW Tau. We used the VERA VLBI array to observe 22 GHz H2O masers. Parallaxes of the four sources were obtained to be 0.247±0.035 mas (4.05±0.59 kpc), 0.54±0.03 mas (1.85±0.10 kpc), 0.562±0.201 mas (1.78±0.73 kpc), and 0.449±0.032 mas (2.23±0.16 kpc). Determination of pulsation period of NSV17351 was done for the first time. We revealed the position and kinematics of NSV17351 in our Galaxy and found that NSV17351 is located in an interarm region. A new period-magnitude relationship was indicated in the infrared region. Various other properties based on the distance measurements are also discussed. We have to emphasize that the VLBI astrometry is effective and the only way for parallax measurements of dust obscured OH/IR stars.

Keywords

VLBIAstrometryMasersAGB starsOH/IR stars
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 300 - 308
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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