AAVSO Special Notice #386
ASASSN-14cl New large-amplitude cataclysmic variable
June 20, 2014
Kris Z. Stanek (The Ohio State University) et al. reported the discovery during the ongoing All-Sky Automated Survey for SuperNovae (ASAS-SN) of a bright transient (10.66V) on 2014 June 14.52 UT. Data were obtained using the quadruple 14-cm "Brutus" telescope in Haleakala, HI (hosted by Las Cumbre Observatory Global Telescope Network).
(ATel #6233, http://www.astronomerstelegram.org/?read=6233)
Stanek et al. also report that the object is identified with
SDSS J215457.68+264112.7 (g=18.8, r=18.7), which is also designated
USNO-B1.0 1166-0570046. The amplitude indicates the object may be
a WZ Sge-type cataclysmic variable.
Coordinates: R.A. 21 54 57.70 Dec. +26 41 13.0 (2000.0)
Spectroscopy by Francois Teyssier (ARAS; Rouen, France) obtained on June 15.0 UT and reported in ATel #6235
(http://www.astronomerstelegram.org/?read=6235) shows that
ASASSN-14cl is a dwarf nova in outburst. Spectra may be downloaded
via the Astronomical Ring for Access to Spectroscopy (ARAS) site at
Observations by Arto Oksanen (Muurame, Finland) and Colin Littlefield (South Bend, IN) show <0.1-magnitude amplitude variations, which may be related to early superhump formation. Nick James (Chelmsford, England) reports a possible superhump period from his observations made around June 19.0804 UT that is different from earlier values published but indicates the difference may be due to insufficient data on his part.
11 observers have contributed over 4,000 B/V/TB/TG and visual observations to the AAVSO International Database to date. The earliest observations reported to the AAVSO include: 2014 June 13.5 UT, <16.2 V (ASASSN);
14.91180, 10.5 visual (W. Kriebel, Schierling/Walkenstetten, Germany);
15.059, 10.6 visual (P. Schmeer, Bischmisheim, Germany); 15.18567, 10.702 V +/-0.004 (A. Oksanen, Muurame, Finland);
15.18653, 10.664 V +/-0.004 (Oksanen);
The most recent observations are:
2014 June 18.90760, 11.8 visual (Kriebel);
18.99306, 11.9 visual (K. Wenzel, Grossostheim, Germany);
20.25970, 11.9 visual (M. Komorous, London, ONT, Canada);
Finder charts with a sequence may be created using the AAVSO
Variable Star Plotter (http://www.aavso.org/vsp).
A new sequence has been posted for this object. Observers who have already submitted data should check their data to see if they need to re-reduce their photometry.
Please report observations to the AAVSO International Database using the name ASASSN-14cl.
This AAVSO Special Notice was compiled by Elizabeth O. Waagen.
HST CV Program Success
From Boris Gaensicke
March 22, 2014
The observations of SDSS1006+2337 went well.
This was the last star in this HST program, and
I would like to sincerely thank all of you for the
outstanding support you have provided!
I met last week some of the people from STScI
involved in the technical implementation of the
HST observations, and they said it has been one
of the most challenging programs they have done!
Without your help, these HST observations would
not have been possible. It has worked beautifully,
with just one out of the 41 targets being kicked
off the schedule for bad behaviour! But there
were a few close calls, and a number of sleepless
nights throughout the past 1 1/2 years... as such,
I am not too sad we have reached the end of it.
We have begun working on this fantastic data set,
and will get back in touch with you later on some
of the results we find.
All the best,