[Date Prev][Date Next][Date Index]

(cba:news) CBA campaigns (Joe Patterson) [2018-07-04T10:56:18Z]


Hi CBAers,

Some new, old, and continuing campaigns.

1. Keep up the GREAT work on Maxie = ASASSN-18ey. We're past the hundred-day mark now, and the star is still bright (13) and flashing its very powerful superhumps. We've seen a few superhumps before from the black-hole transients, but never with such longevity, amplitude, and long orbital period (~16 hours). And very amenable to our observing style of long, continuous time series. Truly, truly a Maxie!

2. Time to quit on CR Boo. We have a fair amount of coverage near quiescence (our target), but lots of up-and-down cycles too - the bane of CR Boo campaigns, and presenting analysis problems. Time to sort it in Boo's off-season.

3. As many of you know, the dwarf nova V392 Per seems to have had a classical-nova outburst this year. If true (it *seems* to be true), the star warrants all the attention we can muster. I doubt that anyone can observe it now - but put it on your list when it re-appears (August?)

4. Another star of this type (nova <-> dwarf nova) is V1213 Cen, still available briefly in the evening sky. We've strangely overlooked it - but it's likely to become a touchstone star in understanding the evolution of CVs among the various subtypes (nova/novalike/dwarf-nova/ER UMa). We published a theory about this a few years ago (BK Lyn) - let's find out if it's true.

5. Just emerging in the morning sky is VW Hyi, and the radio astronomers are keen to launch an across-the-spectrum study during its next outburst - preferably starting early in the outburst. Both supers and normals are eligible - and even a *visual* observation is useful (what's wanted is primarily a "trigger" for the multiband campaign). Even a *prediction* of the next outburst is of interest, too.

6. Again on the nova theme, two of our old favorites are back in the sky, asking for attention: V1974 Cyg and V1494 Aql. The big-shot novae of the 1990s. They both have - or had at last glance - fascinating orbital light curves. Very good targets for a July-Aug campaign.

Now that I hear of all the CBAers attending the Warwick AAVSO/BAA meeting, I really wish I could go. Lotta personal issues to attend to during the next few weeks. I'll definitely make the November AAVSO meeting in Flagstaff.

joe p



____________________________________________________________
Center for Backyard Astrophysics (CBA) mailing lists
https://cbastro.org/communications/mailing-lists/