Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-09
Astronomy and Astrophysics
Astrophysics
13 pages including 4 tables, and 13 postscript figures. Accepted for PASJ (Publication of the Astronomical Society of Japan)
Scientific paper
Light variation of the 47 AGB star candidates in the outer Galactic disk has been monitored at I-band for 5 years. Periods were determined well for 18 of them and less reliably for the other 25. The average period of the objects is then 500 days. According to the period-luminosity relation, the mean luminosity of the sample stars is 10000 $\LO$. Based on the absolute luminosity derived from the period-luminosity relation and the apparent luminosity from the observation, the distances to the objects are determined. The distances calculated are slightly greater than those obtained previously on the assumption of constant luminosity of 8000 $\LO$. In addition, SiO maser emission was detected for most of the observed objects so that their radial velocities were known accurately. With the assumption of circular rotation in the Galactic disk, the rotation curve and Oort's constants were derived.
Deguchi Shuji
Jiang Bi-Wei
Nakada Yoshikazu
Nakashima Jun-ichi
Sadakane Kozo
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