[vsnet-alert 15849] Next HST observations: QZ Ser & CC Scl

[Boris Gaensicke]

Apologies - the subject should have read "QZ Ser". As I am
sending this correction, let me also add the next one after
QZ Ser:


CC Scl: Jun 27, 2013 02:12:04  to 05:39:30

I'll send some more details on CC Scl a bit later.

Best wishes,

Boris



On 17 June 2013 22:43, Boris Gaensicke <Boris.Gaensicke at warwick.ac.uk> wrote:
> Dear All,
>
> the HST observations of BD Pav went well... thanks for the help!
> We got a very high quality spectrum, which, at a first glance,
> suggests that the donor in this system may be slightly evolved,
> definitely a very interesting data set to be analysed.
>
> The next target is QZ Ser, and this one *has* an evolved
> donor star: John Thorstensen found in 2004 that the companion
> looks like a K4 star, which you would find in a very long period
> CV, six to eight hours - but, the spectroscopic period of
> QZ Ser is only 2h! The only explanation is that the donor
> star we see today is the evolved core of a previously quite
> a bit more massive companion that lost its outer layers to
> the white dwarf. It will be exciting to get a good spectrum
> of the white dwarf, as the abundances in the white
> dwarf atmosphere will reflect those of the material
> accreted from the evolved donor.
>
> The HST observations of QZ Ser are scheduled for
>
> Jun 21, 2013 02:29:47 to 09:14:45
>
> QZ Ser had a superoutburst at the beginning of March,
> please have keep a close eye on it until the time
> of the HST observations.
>
> Best wishes,
>
> Boris
>
> -----------------------------------------------------------------------------------------------------
> For more information on this HST program, see
>
> http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/
> http://deneb.astro.warwick.ac.uk/phsdaj/public_html/12870/Targets.html