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[vsnet-campaign 1050] (fwd) KL Dra outburst! (Wood)
- Date: Thu, 2 Aug 2001 09:07:58 +0900 (JST)
- To: vsnet-alert, vsnet-campaign, vsnet-outburst, vsnet-superoutburst
- From: Taichi Kato <tkato>
- Subject: [vsnet-campaign 1050] (fwd) KL Dra outburst! (Wood)
- Sender: owner-vsnet-campaign@kusastro.kyoto-u.ac.jp
From: "Matt A. Wood" <wood@wd.astro.fit.edu>
Date: Wed, 1 Aug 2001 16:16:37 -0400 (EDT)
Subject: [vsnet-outburst 0] KL Dra superhumps observed
Colleagues:
We observed KL Draconis, a suspected CR Boo star, on 7/31/01 UT. We found
it in high state (mag 16.7 or so) and observed superhumps with a period of
25 minutes (1527 s), which is remarkably close to the 1490s period for CR
Boo. Our observations were taken with an Apogee AP7p CCD at the SARA
0.9-m observatory at Kitt Peak National Observatory. We used 90 second
integrations and no filter. There was cirrus present, but the
differential light curve is good. Observers were Matt Wood and Matt
Casey.
Our light curve from that night and the Fourier transform are available at
www.astro.fit.edu/wood
The star was originally thought to be a supernova, and it's original
designations was sn1998di, however a spectrum showed it to be similar to
the AM CVn class of stars. The classification spectrum is available at:
http://oir-www.harvard.edu/cfa/oir/Research/supernova/images/sn98di.gif
We're writing up a short Letter to announce the period determination, but
I know many of you will be interested to know this result sooner rather
than later. If anyone has access to a 1-m class telescope and can get
more time series observations in the next few days, that would be very
useful. Our telescope is now shutdown for the next month.
The reductions are a little difficult becuase KL Dra in front of a galaxy,
so when it in low state (mag 20), it begins to blend in with the galaxy
and is very tough to get photometry.
Best regards,
Matt
--
Matt A. Wood, Associate Professor Email: wood@wd.astro.fit.edu
SARA NSF-REU Site Program Director Tel: (321) 674-7207
Dept. of Physics and Space Sciences Fax: (321) 674-7482
Florida Institute of Technology WWW: www.astro.fit.edu/wood
Melbourne, FL 32901-6975, USA SARA-WWW: www.astro.fit.edu/sara
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