[vsnet-alert 10728] V358 Lyr is quite blue

[Tom Krajci]

I used some images from tonight's BVRI sequence, specifically B, V, and 
R to make a color image.  I'm not a color image wizard, so the result is 
not pretty, but V358 Lyr is the bluest object in the field.

A .jpg image can be seen at:
<http://picasaweb.google.com/tom.krajci/V358Lyr#5271712441833518370>

Anway, Arne will get the images tomorrow AM and do a more scientific 
analysis.

-- 
-------------------------------------------
Tom Krajci
Cloudcroft, New Mexico
http://picasaweb.google.com/tom.krajci

Center for Backyard Astrophysics (CBA)
http://cbastro.org/ CBA New Mexico

American Association of Variable Star
Observers (AAVSO): KTC http://www.aavso.org/
-------------------------------------------

Daisaku NOGAMI wrote:
> Congratulations, Jeremy!  And thank you for your quick confirmations,
> Shawn, and Tom!
>
> This outburst is the first one since the discovery of this object in
> photographic plates in 1965 by Hoffmeister (1967, Astron. Nach., 289,
> 205).  You can see this plate image in Antipin et al. (2004, IBVS 5544,
> http://www.konkoly.hu/cgi-bin/IBVS?5544).  The recurrence cycle of the
> outburst is 43 years!?, the longest one among dwarf novae, exceeding
> that of WZ Sge, although the faintness at the maximum of this object
> may have hindered our detection.  No detection of the quiescent
> couterpart in Arne's deep image still suggests that the outburst
> amplitude is large, and the outburst is rare.
>
> We strongly encourage time-resolved photometry (unfiltered one is OK,
> of course), and spectrocopy if possible.
>
> Best regards,
> Daisaku Nogami
> VSNET Collaboration Team
>
> On Sat, 22 Nov 2008 18:50:36 -0500
> Shawn Dvorak <sdvorak at rollinghillsobs.org> wrote:
>
>   
>> I just took an unfiltered image of the field and believe that V358 Lyr 
>> is in outburst.  I don't have any previous images to compare against but 
>> using the Downes online catalog it appears that there's an object at the 
>> correct location.  Using the 14.0 mag star from the AAVSO sequence I 
>> measure the star at:
>>
>> Nov 22.98 16.14CV
>>
>> The FITS file is available at 
>> http://www.rollinghillsobs.org/v358lyr-001c.fit for inspection.
>>
>> Shawn Dvorak
>> Clermont, FL USA
>>
>> Jeremy Shears wrote:
>>     
>>> V358 Lyr is possibly in outburst - confirmation urgently required. In 
>>> a single unfiltered CCD image obtained from the Bradford Robotic 
>>> Telescope this evening I made the following measurement:
>>>
>>> Nov 22.917 16.26C
>>>
>>> I reported this to Gary Poyner, who measured the same image as 16.21C 
>>> (both using the AAVSO chart).
>>>
>>> However, we note that the position is very slightly West of the 
>>> positon marked on the AAVSO chart, placing the suspect object half way 
>>> between the marked position for V358 and the 175 comp. Unfortunately 
>>> we only have a single BRT image and we cannot rule out a fault 
>>> (doesn't look like a hot pixel), hence we cannot be sure that it is 
>>> defintely V358 Lyr in outburst, thus the need for confirmation. Cloudy 
>>> conditions at both my location and Gary's are preventing our confirmation.
>>>
>>> Jeremy Shears
>>> Cheshire, UK.
>>> __________________________________________________________
>>>       
>