[vsnet-polar 57] Re: [FWD] UW Pic in active state

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

Re: [FWD] UW Pic in active state

> The optical counterpart (later designated UW Pic) of the ROSAT
> All-Sky Survey X-ray source RX J0531.5-4624 has been
> spectroscopically identified as the most northern component of the
> appearant stellar triple visible within the 3-sigma error circle of
> the X-ray position.  The cataclysmic variable is star "A" in Fig. 2
> of Reinsch et al., A&A, 291, L27, 1994.  The triple is not resolved
> on the DSS image. 

  Thank you for the information.  Actually on the DSS images, star "A"
and southern double are not clearly resolved but shown as an elongated
object.  Reinsch et al. (1994) correctly pointed out that the star "A"
is a variable, while the chart in Downes' online catalog has been
marked the triple as a CV.  As B. Monard report in [vsnet-alert 7537],
it was confirmed that the violently oscillating object is actually UW
Pic, the northmost star of the triple = star "A".  Downes' chart was
corrected soon after this indication.

> Given a distance estimated to be (300 +/- 60) pc, the proper motion 
> of UW Pic should be negligible. 

  If it has the transversal velocity of 100 km/s, the proper motion
would be about 0.07"/yr, which can be detected when compared with
~20 or more years old images.

Sincerely Yours,
Hitoshi Yamaoka, Kyushu Univ., Japan
yamaoka@rc.kyushu-u.ac.jp

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp