(cba:news) Fwd: [vsnet-alert 20780] Re: OV Boo outburst = SDSS J1507+52

Joe Patterson jop at astro.columbia.edu
Tue Mar 14 20:12:03 EDT 2017

Hi CBAers,

Yesterday in America, the CBO dominated the news.  Today it seems to be 
the CBA - because one of our all-time favorite stars burst into its 
first known eruption.  Bootis is decently available in the sky 
(1507+52)...so get thee to a telescope.

At 12th magnitude you can even use a filter (V is best).  But as usual, 
it's the time series we're most interested in, so a nice long time 
series in unfiltered light is just perfect.  This could be a short 
outburst, so speed might be essential!


-------- Forwarded Message --------
Subject: [vsnet-alert 20780] Re: OV Boo outburst
Date: Wed, 15 Mar 2017 03:42:10 +0900
From: Keisuke Isogai <isogai at kusastro.kyoto-u.ac.jp>
To: vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp 
<vsnet-alert at ooruri.kusastro.kyoto-u.ac.jp>, 
vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp 
<vsnet-outburst at ooruri.kusastro.kyoto-u.ac.jp>, 
baavss-alert-subscribe at yahoogroups.com, 
cvnet-outburst-subscribe at yahoogroups.com

     This is an additional information.
     OV Boo is also known as SDSS J1507+52. In order to explain why the 
orbital period
is  below the period minimum although the object has WZ Sge-like properties,
Patterson et al. (2008) proposed that  the secondary of OV Boo might be a
Population II (metal-poor) star. (Because Pop. II star is smaller than 
normal stars.)
     However, the spectroscopic study is insufficient, and the 
population has not
been confrimed.
      If this outburst is "metal-poor outburst", the behavior might be 
different from
the ordinary DNe outburst.

On 2017年03月15日 02:51, Keisuke Isogai wrote:
>     OV Boo has ultra-short period of 0.046 d, and the period is below the period minimum.
> By the spectroscopic study, Patterson et al. (2008) suggested that OV Boo is a member
> of WZ Sge stars, but the object had shown no outbursts.
>     This outburst is very likely to be a WZ Sge-like superoutburst. Thus time-series
> observations are strongly encouraged.
> On 2017年03月15日 01:42, Seiichi Yoshida wrote:
>> Dear colleagues,
>> I am Seiichi Yoshida working on the MISAO Project.
>> Masaru Mukai, Kagoshima, Japan, reported that OV Boo
>> (R.A. 15 07 22.35, Decl. +52 30 39.8) is bright as 11.4 mag on
>> Mar. 14.63 (UT), using Nikon 105-mm lens + CCD (STL6303E) + IR-cut
>> filter.
>> The VSX data shows it is a CV+EA+ZZ/GWLIB type with a range of
>> 18.0-20.6 mag.
>>       Best regards,
>> --
>> Seiichi Yoshida
>> comet at aerith.net
>> http://www.aerith.net/

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