[vsnet-alert 15976] Re: Next HST observations: HS2214+2845 (V513 Peg) & OT J213806.6+261957

[Brian Skiff]

     Robert Modic has kindly pointed a further mix-up,
and I should have been more specific about which star
I was referring to in my original note.  Briefly, the
first message was correct after all, and refers to
OT J213806.6+261957, _not_ to HS 2214+2845 = V513 Peg.
The latter is the star Arto was thinking I was writing about.


---  OT J213806.6+261957 is indeed the moving component
     presently nearly 3" southeast of a zero-motion
     field star.  It is relatively very bright on the 
     SDSS u-band image.  Its motion is toward the northeast,
     heading away from the optical companion.


---  HS 2214+2845 = V513 Peg is the northwestern star of
     another optical pair.  This time the cv is nearly
     fixed, while the companion is moving approximately
     southeast-ward away from the cv.  Astrometry even
     from recent catalogues makes this obvious:

epoch       theta  rho    source
1997.843   163.3   4.77   2MASS
2001.525   161.6   4.91   CMC14
2008.844   161.0   5.05   SDSS DR9
2009.876   160.9   5.07   SDSS DR9


Sorry for the communication break-down --- just trying
to be helpful of course!


\Brian




On Sat, 2013-07-13 at 10:37 -0700, Brian Skiff wrote:
> Arto is correct --- I goofed (for reasons not obvious
> to me) in making the cv the moving southeastern star of
> the pair.  A look at the GALEX images, for instance,
> makes it obvious which star has the strong uv flux.
>      So indeed the cv is the northwestern star.
> My apologies for any confusion this may have caused!

> 
> 
> On Sat, 2013-07-13 at 10:29 +0300, Arto Oksanen wrote:
> > Hi Brian,
> > 
> > The SE star? Are you sure?  I have been measuring the NW star with 5 arc
> > sec radius aperture. The NW star outbursted, not the SE star of the close
> > pair.
> > 
> > This is the correct identification:
> > http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/HS2214+2845.sdss.gif
> > 
> > arto
> > 
> > 
> > 2013/7/12 Brian Skiff <bas at lowell.edu>
> > 
> > >
> > >
> > >      For what it's worth, comparison of POSS-I plate-scans
> > > with recent images clearly show that the cv has modest
> > > proper motion, and is presently the southeastern of the
> > > optical pair.  The SDSS DR9 astrometry indicates a
> > > separation of 2".5 at epoch 2009.8, which is increasing.
> > >