[vsnet-alert 9950] re CSS080304:090240+052500: indeed a dwarf nova,
WZ Sge-type?
da55 at Safe-mail.net
da55 at Safe-mail.net
Thu Mar 6 01:17:15 JST 2008
Kato Taichi forwarded from atel 1411 :-
> It shows a blue continuum, with emission lines of H-alpha 6563, H-beta 4861, He I 5015, He I 7065, He II 4687, and He II 6683, with an approximate observed redshift of 150 km/s.<
Does this mean the object's core redshift, ie -150 km/s, appropriate for a Halo object?
Getting several UGWZ of 20th mag in this vaguely general direction (well, 3).
also :-
>The lines are bimodal, with a velocity splitting of about 500 km/s.
Alrighty, is that the same as saying a P Cygni profile suggesting expansion velocities of 500 km/s, or possibly that's a full range, so 250 km/s (I suppose that'd be modified by the sine of unknown inclination too), which doesn't quite sound enough for a nova, except for a few very 'slow nova' possibly.
Otherwise, if they're split by a self absorption core due to a highly inclined disc component, what's the 500 km/s about, because that sounds a bit fast for a rotating disc, but I'm not too certain on known values for such, though for discs to have rotational velocities similar to expansion velocities sounds a bit strange.
Cheers
John
John Greaves
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