[vsnet-alert 9950] re CSS080304:090240+052500: indeed a dwarf nova, WZ Sge-type?

[da55 at Safe-mail.net]

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