[vsnet-chat 2729] Studies on variable stars

[Seiichi Yoshida <comet@aerith.net>]

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:

  http://vsnet.aerith.net/misao/

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):

  http://vsnet.konkoly.hu/IBVS/

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.

    IBVS 4746    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT I: MisV0001-MisV0100
    Yoshida, S.; Kadota, K.

    IBVS 4770    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT II: MisV0101-MisV0150
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4771    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT III: MisV0151-MisV0200
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4780    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT IV: MisV0201-MisV0250
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4793    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT V: MisV0251-MisV0300
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4812    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT VI: MisV0301-MisV0350
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4842    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT VII: MisV0351-MisV0400
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4854    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT VIII: MisV0401-MisV0500
    Yoshida, S.; Kadota, K.; Kato, T.

    (writing)    NEW VARIABLE STARS DISCOVERED IN THE MISAO PROJECT IX: MisV0501-MisV0600
    Yoshida, S.; Kadota, K.; Kato, T.

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):

  http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/

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.

    IBVS 4813    REVISED ASTROMETRY OF 33 VARIABLE STARS
    Yoshida, S.; Kadota, K.; Kato, T.

    IBVS 4841    REVISED ASTROMETRY OF VARIABLE STARS (2)
    Yoshida, S.; Kadota, K.; Kato, T.

    (writing)    REVISED ASTROMETRY OF VARIABLE STARS (3)
    Yoshida, S.; Kadota, K.; Kato, T.

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.

    IBVS 4814    ASTROMETRY AND CONFIRMATION OF VARIABILITY OF 21 NSV OBJECTS
    Yoshida, S.; Kadota, K.; Kato, T.

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.

    IBVS 4792    POSSIBLE IDENTIFICATION OF MisV0106 AND NSV 25425
    Yoshida, S.; Kadota, K.; Kato, T.

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.

    IBVS 4843    MIS-IDENTIFICATION OF V854 OPHIUCHI
    Yoshida, S.; Kadota, K.; Kato, T.

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.

    IBVS 4845    V949 SAGITTARII IS NOT A NOVA BUT A RED VARIABLE
    Yoshida, S.; Kadota, K.; Kato, T.; Schmeer, P.

In addition, some more papers are in submitting or writing. The themes 
are: 
  - The position of NSV 11661 was recorded by mistake, revealed by the 
    discovery of MisV0134.
  - A strange planetary nebula PK 32-3.1 was just contaminated by a
    variable star MisV0701. 
  - Mis-identification of V735 Sgr was revealed, triggered by the
    discovery of MisV0041.

P.S.
The past MISAO project announce mails are available at:
  http://vsnet.aerith.net/misao/

--
Seiichi Yoshida
comet@aerith.net
http://vsnet.aerith.net/

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