[Aavso-photometry] Re: (cba:news) V587 Lyr - another UGSU-type dwarf nova ?

[David Boyd]

Hello,

I have observed V587 Lyr unfiltered for 1.5 hrs tonight and it has remained 
steady at 15.97 with a std dev of 0.02. No sign of superhumps or any other 
significant modulation.

Regards,
David Boyd (BDG)

----- Original Message ----- 
From: <thorsten at partita.dartmouth.edu>
To: "Tonny Vanmunster" <Tonny.Vanmunster at cbabelgium.com>
Cc: "cba-news" <cba-news at cba.phys.columbia.edu>; 
<cvnet-discussion at yahoogroups.com>; "'Aavso-Photometry'" 
<aavso-photometry at mira.aavso.org>
Sent: Friday, June 10, 2005 1:26 PM
Subject: Re: (cba:news) V587 Lyr - another UGSU-type dwarf nova ?


>
> Hello all,
>
> I have one spectrum of V587 Lyr from 2003 June, of rather poor
> quality.  It shows signs of a cool star of around type K (together
> with weak H-alpha emission, so I evidently did not have the wrong
> object).
>
> On the one hand, this reduces the likelihood that it is
> a UGSU, since the late-type star signature usually indicates a
> long orbital period.
>
> On the other hand, QZ Ser and EI Psc (= RX2329+06)
> unexpectedly showed cool star features but proved to have
> short orbital periods -- EI Psc's period is only 64 min, and
> it shows superhumps.  These are unusual systems.
>
> So, further monitoring would be very helpful.  I think it
> is unlikely that a clear superhump will emerge, but if it
> does it would be extremely interesting.
>
> John
>
> On Fri, 10 Jun 2005, Tonny Vanmunster wrote:
>
>> Dear colleagues,
>>
>> I just finished an unfiltered CCD photometry session on the dwarf nova V587
>> Lyr, reported to be in outburst. The session lasted for 2.1 hours (2005,
>> June 09/10) and showed V587 Lyr around mag 14.8 (unfiltered). The resulting
>> light curve clearly shows a hump modulation, with an amplitude of 0.1 mag,
>> that strongly resembles a superhump signature. A period analysis of the hump
>> structure yields a best value around 0.06d.
>>
>> It is difficult to tell if the hump indeed represents a superhumping system,
>> but it wouldn't surprise me. I would very much appreciate if someone could
>> spend a few hours of photometry on this target, as soon as possible. It will
>> most probably be cloudy over Belgium during the weekend, so I will not be
>> able to follow up on this one myself.
>>
>> I studied V587 Lyr before, during 1 night in the June 2001 outburst, and
>> could not detect modulations at that time.
>>
>> I will publish my V587 Lyr lightcurve later on at my website.
>>
>> Best regards,
>> Tonny
>>
>>
>> Tonny Vanmunster
>> CBA Belgium Observatory
>> http://www.cbabelgium.com
>> ________________________________________________________
>> PERANSO : The Final Frontier of Period Analysis Software
>> http://www.peranso.com
>> ________________________________________________________
>>
>>
>>
>>
>> ____________________________________________________________
>> Center for Backyard Astrophysics (CBA) mailing lists
>> http://cba.phys.columbia.edu/communications/mailing-lists/
>>
>
> -- 
> ----------------------------------------------------------------------------
> John R. Thorstensen - Professor and Chair
> Department of Physics and Astronomy
> Dartmouth College
> 6127 Wilder Laboratory
> Hanover, NH 03755
>
> Office: 239 Wilder Hall
> Phone:  voice 603-646-2869     FAX 603-646-1446   Hinman box 6127
> ----------------------------------------------------------------------------
>
>
> ____________________________________________________________
> Center for Backyard Astrophysics (CBA) mailing lists
> http://cba.phys.columbia.edu/communications/mailing-lists/
>