(cba:news) t pyx, finis
jop at astro.columbia.edu
Thu Jan 29 06:46:55 EST 2015
Thanks mostly to the great watchfulness of Berto and Gordon, the year's
T Pyx campaign - in fact the ten-year campaign - is over. Not only did
we (Arto being the main player then) document in much detail the return
of the orbital signal after eruption, but the coverage since then
(2012-3-4/5) demonstrates that the orbital period continues to increase
- at about the same rate as pre-eruption. This supports the idea that
the oddities of T Pyx (the great luminosity and Pdot) represent a true
evolutionary phase, rather than something transient and essentially
So we're finished with it.
I hope people (mostly southern) will give HZ Pup a try. That one hasn't
elicited interest this year. It's 2.5 mag fainter, so I can understand
why... but it's the "new kid on our block", and any good time series you
manage to get would have high impact.
Then there's CP Pup. Same part of the sky, pretty bright (15.0), and
usually with a high-amplitude signal. The fascinating thing about CP
Pup is that this strong signal isn't stable in phase or amplitude, and
isn't a superhump either. It's something new, related to the 90-minute
Porb in some way not yet known. I have a working hypothesis (the 2:1
cousin of the normal 3:1 superhump), but it's hard to test because the
signal is so damn SLIPPERY. But February is surely the right time to
try! Bob Rea has been going strong on it; it would be great to have
help from others.
Finally - for the southern novae - can someone have a look at V382 Vel?
How bright is it now?
Of course the DWARF NOVAE have started off the year just great -
especially the various ASAS guys: 14mv, 15bu, 15bp. I'm going to need a
lot of help with these guys, because:
1. They're so numerous.
2. I broke my hand recently, and everything I do with my hands ranges
from twice-as-hard to twice-as-long to impossible. This message will
take 1-2 hours to type. I hope other people, esp. those of you doing
analysis, will help with the information flow. (I can still manage the
quickie things, but longer messages are intimidating.)
Some of the dwarf novae are really striking, practically unique: 14mv
and 14ei are definitely in that category, and the other two might be (I
haven't studied them yet). It's awfully weird to use a word like
"unique" for a class with already about 700 members! Is this the "tip
of an iceberg"?
Have a great ol' February!
Center for Backyard Astrophysics (CBA) mailing lists
More information about the cba-public