[vsnet-alert 15976] Re: Next HST observations: HS2214+2845 (V513 Peg) & OT J213806.6+261957
bas at lowell.edu
Sun Jul 14 06:01:45 JST 2013
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!
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.
> > >
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