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- Title
Astrometric VLBI Observations of the Galactic LPVs, Miras, and OH/IR stars.
- Authors
Nakagawa, Akiharu; Kurayama, Tomoharu; Orosz, Gabor; Burns, Ross A.; Oyama, Tomoaki; Nagayama, Takumi; Miyata, Takashi; Sekido, Mamoru; Baba, Junichi; Wada, Kiichi; Tarchi, A.; Reid, M.J.; Castangia, P.
- Abstract
Studies of Galactic LPVs based on astrometric VLBI are presented. We use a VLBI array, "VERA", to measure parallaxes and calibrate the K-band period luminosity relation (PLR) of the Galactic Miras. Since the PLR offers a distance indicator, its calibration is crucial to reveal their spatial distribution. Parallaxes of dozens of LPVs are presented. For the longer period stars, the mass-loss is high and the stars are obscured and recognized as OH/IR stars. We estimated mid-infrared absolute magnitudes of dozens of OH/IR stars and found that they show a loose concentration around −14 mag at λ of 11.6 μm, indicating an existence of PLR for OH/IR stars. Astrometry of OH/IR stars will also help us to study non-steady spiral arms as proposed from the latest simulation study of the galactic dynamics. We will start astrometric VLBI observation of two OH/IR stars NSV25875 and OH127.8+0.0 at 43 GHz with VERA.
- Publication
Proceedings of the International Astronomical Union, 2017, Vol 13, Issue S336, p365
- ISSN
1743-9213
- Publication type
Article
- DOI
10.1017/S1743921317009449