[Aavso-photometry] Intensive photometry of TU Cas

[Jeff Hopkins]

Hello Richard,

This sounds interesting. I may give it a shot in the U and B bands 
with my photon counting system. Can you post the data you have? I 
have never been successful at looking at the archives.

Jeff

At 12:14 -0700 11/19/05, Richard Miles wrote:
>At Arne's suggestion 2 nights ago on the AAVSO chatroom, I carried 
>out simultaneous V- and I-filter photometry of this double-period 
>Cepheid over a 6-hr interval.
>
>Have now uploaded the reduced data thereby increasing the size of 
>the AAVSO data archive on this star by one-third.
>
>I was fortunate to catch the star as it approached and passed 
>through minimum.  There are some real interesting features on the V 
>lightcurve, which are entirely absent in the I-band indicative of 
>changes in the blue region of the spectrum.
>
>For instance at 2453692.35, there is a gradual decline in brightness 
>of 0.10 mag over the course of 3 minutes followed by a similar 
>return to normal brightness.
>
>However, what's really cool is the interval from 2453692.48 to 
>2453692.50 when the star undergoes some sort of oscillation 
>resulting in very rapid drops in brightness in V magnitude on a 
>1-minute timescale having a typical amplitude of 0.2 mag!  The most 
>extreme oscillation involved a drop of about 0.3 mag over a minute 
>or so, followed by a return to the normal brightness level in less 
>than 20 seconds.  Now that's what I call a variable star!
>
>I should point out that there is a nice write up on this star, which 
>has a very long history and is the current  Variable Star of the 
>Season, on the AAVSO website at:
>
>http://www.aavso.org/vstar/vsots/
>
>It's a very informative account prepared by Kerri Malatesta, AAVSO 
>Technical Assistant, and make good reading.
>
>Enjoy,
>Richard Miles (MXL)

-- 
Jeff Hopkins
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