[vsnet-chat 7771] Re: New variable star MisV1447

[Seiichi Yoshida]

Dear colleagues,

John Greaves pointed out that Nutterson has already discovered its
unspecified slow variation from the NSVS data:

  http://skydot.lanl.gov/nsvs/star.php?num=9669812&mask=15636

Patrick Wils also pointed out that this star was already registered in
the AAVSO VSX database by Martin Nicholson based on the NSVS data.

The NSVS data shows the position at R.A. 05h57m39s.25,
Decl. +08o49'57".61, which is roughly center of the northern 11-mag
star, GSC 0716-01435, and the southern variable star.

MISAO Project observations revealed that the southern star, GSC
0716-01707, is variable. However, because the variation has been
already discovered from the NSVS data, further observations should use
the designation NSVS 9669812, not MisV1447.

I also found that this star was observed by ASAS, which shows a nice
light curve as a Mira type variable:

  http://www.astrouw.edu.pl/cgi-asas/asas_variable/055739+0849.4,asas3,0,0,500,320

Best regards,

> Dear colleagues,
> 
> I am Seiichi Yoshida working on the MISAO Project.
> 
> Masaru Mukai, Kagoshima, Japan, discovered a new variable star
> MisV1447.
> 
> On Jan. 1, 2012, Mukai investigated his survey images taken on
> Dec. 17, 2011, with Nikon 105-mm f/2.8 camera-lens and STL6303E
> camera, and found a possible brightening of this star. It looks
> fainter than a nearby star GSC 0716-01435 on his past images between
> Mar. 4 and Dec. 4, 2011, but it looks brighter on Dec. 17.
> 
> Seiichi Yoshida, MISAO Project, investigated the survey images by 
> Youichirou Nakashima, Okayama, Japan, with Canon 500-mm f/4.5 camera
> lens and SBIG ST-8 in the course of the MISAO Project, and confirmed
> the variation of this star. We assigned a new variable star number of
> the MISAO Project, MisV1447, to this star.
> 
> Mukai and Yoshida found this star is identified with IRAS 05549+0849.
> So this star will be a Mira type variable.
> 
> The position measured from Nakashima's images is R.A. 05h57m38s.99,
> Decl. +08o49'25".8 (J2000.0).
> 
> The amplitude during one year from early 2011 to early 2012 is
> 10.9-<13.3 mag from Mukai's unfiltered CCD images, or 8.8-9.9 mag from
> Nakashima's unfiltered CCD images. The difference will be due to the
> infrared sensitivity of their CCD cameras. Their measurements are
> coincident on the other 10-11 mag stars near by MisV1447.
> 
> Akira Takao, Kita-Kyushu, Fukuoka, Japan, also confirmed the variation
> of 9.9-<13.4 mag from his unfiltered CCD images with 100-mm f/4 camera
> lens and STL-6303E, although possibly blended with a nearby 11-mag
> star when MisV1447 was bright.
> 
> MisV1447
>   R.A.  05h57m38s.99
>   Decl. +08o49'25".8  (2000.0)
>   Mag.  10.9-<13.3C
>   Type  M?
> = GSC 0716-01707  05h57m38s.99 +08o49'25".2  Error:0.3"  Mag:13.41  MagError:0.41  Band:6  Class:0  Plate:0205  Flag:F  Epoch:18 JAN 1985
> = USNO-A2.0 0975.02303571  05h57m38s.989 +08o49'25".36  Mag(R):13.5  Mag(B):17.2
> = IRAS 05549+0849  05h57m39s.2 +08o49'27"  Ellipse:38x5"  P.A.:91  Flux(12):1.757  Flux(25):0.7396  Flux(60):<0.4000  Flux(100):<1.496  Var:19%
> 
> http://www.aerith.net/misao/data/misv.cgi?1447
> 
> Unfiltered CCD magnitude from Mukai's images:
> MisV1447 20110304.48204 <131C Mis
> MisV1447 20110304.48307 <130C Mis
> MisV1447 20111124.55348 <133C Mis
> MisV1447 20111124.58953 <130C Mis
> MisV1447 20111204.48856 <130C Mis
> MisV1447 20111204.52872 130C Mis
> MisV1447 20111217.52721 112C Mis
> MisV1447 20111217.52819 109C Mis
> MisV1447 20120112.42920 110C Mis
> MisV1447 20120112.43008 109C Mis
> MisV1447 20120112.45272 113C Mis
> 
> Unfiltered CCD magnitude from Nakashima's images:
> MisV1447 20110201.53870 95C Mis
> MisV1447 20110201.54007 93C Mis
> MisV1447 20110201.54747 93C Mis
> MisV1447 20110221.52543 96C Mis
> MisV1447 20110221.52676 94C Mis
> MisV1447 20110221.53231 94C Mis
> MisV1447 20110401.45965 99C Mis
> MisV1447 20111125.56823 98C Mis
> MisV1447 20111125.56956 97C Mis
> MisV1447 20111125.57090 96C Mis
> MisV1447 20111125.57223 96C Mis
> MisV1447 20111219.76601 90C Mis
> MisV1447 20111219.76735 89C Mis
> MisV1447 20111219.76868 88C Mis
> MisV1447 20111219.77002 88C Mis
> 
> Unfiltered CCD magnitude from Takao's images:
> (possibly blended with a nearby 11-mag star)
> MisV1447 20110828.82314 <134C Toa
> MisV1447 20110923.80233 119C Toa
> MisV1447 20111025.74396 113C Toa
> MisV1447 20111124.71579 106C Toa
> MisV1447 20111214.67044 101C Toa
> MisV1447 20111227.63488 99C Toa
> MisV1447 20120117.55064 99C Toa
> MisV1447 20120121.57527 99C Toa
> 
> Best regards,
> 
> --
> Seiichi Yoshida
> comet at aerith.net
> http://www.aerith.net/

--
Seiichi Yoshida
comet at aerith.net
http://www.aerith.net/