[vsnet-alert 16832] Re: [vsnet-alert] ASASSN-14ac (ATEL)

[Roger Pickard]

I attach my data on this star for 2014 Jan 19, 22 and 25.  I've 
delayed sending this as each night the data was of poor quality but 
I've noted the recent appeal by Taichi Kato and send it in case it is 
still of some use.

Regards,
Roger Pickard

----- Original Message ----- 
From: "Roger Pickard" <roger.pickard at sky.com>
To: <vsnet-alert at yahoogroups.com>; 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp>; 
<vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp>
Sent: Monday, January 20, 2014 12:20 PM
Subject: Re: [vsnet-alert] ASASSN-14ac (ATEL)


>A steady decline from around 14.6V to 14.65V between 2014/19 at 21.21 
>and 2014/20 at 04.37.
>
> Roger Pickard
>
>>
>> ----- Original Message ----- 
>> From: "Taichi Kato" <tkato at kusastro.kyoto-u.ac.jp>
>> To: <variable_star_forum at yahoogroups.com>; 
>> <vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>; 
>> <vsnet-alert at yahoogroups.com>; 
>> <vsnet-campaign-dn at ooruri.kusastro.kyoto-u.ac.jp>; 
>> <vsnet-newvar at ooruri.kusastro.kyoto-u.ac.jp>; 
>> <vsnet-newvar at yahoogroups.com>; 
>> <vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>; 
>> <vsnet-outburst at yahoogroups.com>
>> Sent: Sunday, January 19, 2014 12:51 AM
>> Subject: [vsnet-alert] ASASSN-14ac (ATEL)
>>
>>
>>>   The SDSS color u-g = -0.3 is very blue for a WZ Sge-type
>>> candidate.  Time-series observations and spectroscopic
>>> observation are encouraged!
>>>
>>> ==============================================================================
>>> ATEL #5775      ATEL #5775
>>>
>>> Title: ASAS-SN Discovery of a Large Amplitude (Delta V ~ 7 mag) CV
>>> Candidate
>>> Author: B. J. Shappee, K. Z. Stanek, C. S. Kochanek, T. W.-S. 
>>> Holoien,
>>> J. Jencson, U. Basu J. F. Beacom (Ohio State), J. L. Prieto 
>>> (Princeton),
>>> D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. 
>>> Brimacombe
>>> (Coral Towers Observatory), D. Bersier (LJMU)
>>> Queries: shappee at astronomy.ohio-state.edu
>>> Posted: 18 Jan 2014; 22:50 UT
>>> Subjects:Optical, Cataclysmic Variable
>>>
>>> During the ongoing <a 
>>> href="http://www.astronomy.ohio-state.edu/~assassin/index.shtml">
>>> All Sky Automated Survey for SuperNovae</a> (ASAS-SN
>>> or "Assassin"), using data from the recently expanded quadruple 
>>> 14-cm "Brutus"
>>> telescope in Haleakala, Hawaii,
>>> we discovered a new bright transient source:
>>>
>>> Object       RA (J2000)   DEC (J2000)      Disc. UT Date   Disc. V 
>>> mag
>>>
>>> ASASSN-14ac  7:52:54.9  +53:05:31.2        2014 Jan. 18.31 14.54
>>>
>>> ASASSN-14ac was discovered in images obtained 2014 UT Jan. 18.31 
>>> at V~14.5
>>> and was detected in images obtained 2014 UT Jan. 17.46, but was 
>>> undetected
>>> (V > 17) in images obtained on 2014 UT Jan. 11.29.  The discovery 
>>> image
>>> can be found <a 
>>> href="http://www.astronomy.ohio-state.edu/~assassin/followup/ASASSN-14ac.png">
>>> here</a>.  Vizier reveals a 0.1" SDSS match to a blue g=21.6 star. 
>>> ASASSN-14ac
>>> is most likely a CV with a very strong, nearly 7 mag outburst. 
>>> Given the
>>> large amplitude of its outburst, ASASSN-14ac may be a WZ Sge-type 
>>> dwarf
>>> nova.
>>>
>>> We thank LCOGT and its staff for their continued support of 
>>> ASAS-SN.
>>>
>>>
>>> ------------------------------------
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>>
> 
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