(cba:news) Fwd: [vsnet-alert 17851] WX Ari very deep fading
jop at astro.columbia.edu
Thu Oct 16 20:11:48 EDT 2014
A very low state of another VY Scl star - and one we've observed pretty
extensively in the hign state. This is a great target, if you can
handle the magnitude (18th). And if you think you can't, then... well,
think again, at least briefly. One theory of these stars predicts
large-amplitude phoptmetric signals at the 3.5 hour orbital period. I'm
not *expecting* that, but it's possible. Let's look.
At this brightness, unfiltered is the only reasonable choice. You can
use longish integrations times, since we won't be detecting short
periods in so faint a star.
-------- Original Message --------
Return-Path: <vsnet-alert-bounces at ooruri.kusastro.kyoto-u.ac.jp>
This cataclysmic variable of VY Scl type ("anti-nova") is in the very
low state on the recent survey images from MASTER-Kislovodsk robotic
20140103.649 160C MASTER-Kislovodsk
20140103.680 159C MASTER-Kislovodsk
20141012.971 184C MASTER-Kislovodsk
20141013.017 182C MASTER-Kislovodsk
The recent fading episode was observed 2 years ago (September-December
2012). Eddy Muyllaert has reported unfiltered magnitudes from 16.4: to
16.8: on 2012 Sep. 21 - Oct. 15 [vsnet-alert 15008]. AAVSO data show
the further dimming to as low as 17.4 on 2012 Dec. 20 (with the
large-amplitude orbital variations from about 16.8 to 17.4).
Catalina Sky Survey light curve indicates that after recovering from
the low state the star has reached higher-than-normal level peaking at
14.4 on 2013-09-16, then started fading again:
The current fading episode appears to be the deepest recorded.
Magnitude range in AAVSO VSX is 14.5 - <16.7 CV, orbital period is
Member of MASTER team at SAI MSU
Center for Backyard Astrophysics (CBA) mailing lists
More information about the cba-public