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Measurements of annual parallaxes and proper motions of the red supergiant S Per

Published online by Cambridge University Press:  01 March 2007

Yoshiharu Asaki ,
Shuji Deguchi ,
Hirishi Imai ,
Kazuya Hachisuka ,
Makoto Miyoshi  and
Mareki Honma
Yoshiharu Asaki
Affiliation:
ISAS, 3-1-1 Yoshinodai, Sagamihara, 229-8510, JAPAN email: asaki@vsop.isas.jaxa.jp
Shuji Deguchi
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamimaki, Minamisaku, 384-1305, JAPAN
Hirishi Imai
Affiliation:
Kagoshima University, 1-21-24 Korimoto, Kagoshima, 890-8580, JAPAN
Kazuya Hachisuka
Affiliation:
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, CHINA
Makoto Miyoshi
Affiliation:
National Astronomical Observatory, 2-21-1, Osawa, Mitaka, 181-8588, JAPAN
Mareki Honma
Affiliation:
National Astronomical Observatory, 2-21-1, Osawa, Mitaka, 181-8588, JAPAN
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Abstract

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VLBI phase-referencing monitoring of water vapor masers around the red supergiant, S Per, was conducted over four years. We successfully obtained proper motions and an annual parallax of the masers and determined the distance to S Per of 2.51±0.09 kpc. The proper motion of the star itself was inferred from the maser proper motions, and it was −0.38 and −1.54 mas/yr for right ascension and declination, respectively. Assuming the distance from the sun to the Galactic center, R0, of 8.5 kpc and the rotation velocity around the sun, Θ0, of 220 km/s, the Galactic rotation velocity around S Per is 200 km/s.

Keywords

AstrometryMasersSupergiants

References

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