Japanese version Home Page Updated on April 2, 2000
March 12, 2000
Studies on variable stars
MISAO Project Announce Mail (March 12, 2000)
Hello. I am Seiichi Yoshida working on the MISAO project.
The MISAO Project Home Page is moved. The new URL is:
Almost one year has passed since MisV0001, the first new variable star of the MISAO Project, was discovered. During last one year, various studies and researches on variable stars have been operated, such as discovery of many new variable stars, astrometry revision of known variable stars, etc. The achievements of the studies are published in papers of the IBVS (Information Bulletin on Variable Stars):
Here describes the contents and achievements of studies on variable stars in the MISAO Project.
The number of new variable stars discovered in the course of the MISAO Project reached to 821 now. The position, magnitude range, finding charts, etc., are available at the MISAO Project Home Page. These new variable stars were also published in the following papers.
Not only the new variable stars, the magnitude of known variable stars were also observed. Totally 45,600 magnitude data of 4,265 stars were reported to the VSNET (Variable Star Network):
When no other variable objects are found at or around the cataloged position of a known variable star except for a variable star discovered in the course of new variable star survey close by the position, the cataloged position is judged to be inaccurate or by mistake and the astrometry is revised. The number of known variable stars whose astrometry is revised reached to 174 now. The list of the revised astrometry is available at the MISAO Project Home Page. They were also published in the following papers.
In the MISAO Project, variability of some new variable stars, not designated in the GCVS, discovered by the other projects are also detected. The items are: 31 NSV stars, 6 FASTT stars, 1 TASS star, 1 LD star, 2 stars discovered by Hiraga, 1 stars by Takamizawa, 1 stars by Collins. Because they are not new ones of the MISAO Project, they are not numbered as MisV objects. In the MISAO Project's view, it is significant to confirm the variability of these undesignated variable stars independently. Therefore, the list of these undesignated variable stars is available at the MISAO Project Home Page. And they were also published in the following papers.
Further more, interesting facts were revealed for some variable stars.
There is a variable star NSV 25425 a bit away from MisV0106, one of the new variable stars of the MISAO Project, in the catalog. Actually, a star was detected at the cataloged position of NSV 25425. However, it did not look variable. After researches on the star, it is revealed that the discoverer of NSV 25425 marked on another star on the finding chart by mistake, because NSV 25425 was too faint on the picture. MisV0106 is the true NSV 25425. The details are published in the following paper.
In the similar situation, V854 Oph was mis-identified with another star and MisV0005, one of the new variable stars of the MISAO Project, is the true V854 Oph. The details are published in the following paper.
The position of MisV0508, one of the new variable stars of the MISAO Project, is almost same as that of Nova Sgr 1914. However, MisV0508 looks one of Mira type stars. After researches on the star, it is revealed that only a few data were recorded for Nova Sgr 1914, so the discoverer misunderstood the Mira type star as a nova. The details were published in the following paper.
In addition, some more papers are in submitting or writing. The themes are:
-- Seiichi Yoshida email@example.com http://www.aerith.net/