Revision of 14 MISAO New Variables
March 14, 2007
Yoshida, S.
I am researching further observations of the MISAO Project new
variable stars from the CCD images taken after their discovery.
Here I report the revision of 14 MISAO new variables.
MisV0129 13.0-15.8C M P=310: Epoch=2453290:
Based on the unfiltered CCD observations from 1999 to 2004 by
Ken-ichi Kadota and Nobuo Ohkura, it was revealed to be a Mira
variable with a large variation of 13.0 - 15.8 mag, and a period of
about 310 days.
Based on the unfiltered CCD observations from 1999 to 2004 by
Ken-ichi Kadota and Nobuo Ohkura, it was revealed to be a Mira
variable with a large variation of 10.1 - 15.8 mag, and a period of
about 305 days.
Based on the unfiltered CCD observations from 1999 to 2003 by
Ken-ichi Kadota and Nobuo Ohkura, it was revealed to be a Mira
variable with a large variation of 12.4 - 14.7 mag, and a period of
about 185 days.
The NSVS data revealed that it is a semi regular variable with a
range of 12.7 - 13.5 mag, and a period of 100 days. The unfiltered
CCD observations from 1999 to 2000 by Ken-ichi Kadota and Nobuo
Ohkura coincided to the magnitude range and the period.
However, it was observed as 15.4 mag, much fainter than the range,
in the course of the unfiltered CCD observations by Nobuo Ohkura
using a 300-mm camera lens in 2003 September. It is uncertain if the
star really faded drastically, or that is an effect of came lens
characteristics.
During the survey from Oct. 9 to Dec. 7 in 2003, it was almost
constant at 13.3 mag until Nov. 4, but fading gradually down to 13.5
mag after that.
It brightened up to 11.5 mag in 2001 November, and faded down to
14.0 mag in 2003 November. The magnitude range was enlarged, and it
was revealed to be a Mira variable, not a semi regular variable.
During the survey from Oct. 9 to Dec. 7 in 2003, it was brightening
gradually from 15.5 mag to 14.2 mag.
It brightened up to 10.9 mag in 2003 October. The magnitude range
was enlarged, and it was revealed to be a Mira variable, not a semi
regular variable.
During the survey from Nov. 4 to Dec. 7 in 2003, it was brightening
linearly from 16.0 mag to 13.6 mag, and the magnitude range was
enlarged.
During the survey from Oct. 25 to Dec. 3 in 2003 with an IR-cutting
filter, it was fading linearly from 12.3 mag to 14.1 mag. The
magnitude range was enlarged, and it was revealed to be a Mira
variable, not a semi regular variable.
It faded down to 15.9 mag in 2003 September. The magnitude range was
enlarged, and it was revealed to be a Mira variable, not a semi
regular variable.
During the Rc-band survey from Nov. 19 to Dec. 14 in 2004, it was
brightening linearly from 13.1 mag to 12.1 mag.
MisV1319 11.3-13.2C M P=170 Epoch=2451480
During the survey from Oct. 21 to Nov. 25, it was fading linearly
from 12.1 mag to 13.1 mag.
The NSVS data revealed that it is a Mira variable with a period of
170 days.
It was fainter than 14.1 mag in March and December in 2000. But
after that, it has been almost constant around 13.6 mag since 2001
until 2007. So it can be an eclipsing variable.
It cannot be a red variable based on the USNO-A2.0 color (B-R = 0.6
mag).
Reference:
[vsnet-chat 7335]
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