RE: New Cepheid?

[Thomas Droege <tdroege2@earthlink.net>]

I am working hard to get more data.  Everything is running routinely!  Last
night it was supposed to clear after midnight so I fired things up.  This
morning after processing I got all of 13,066 measurement pairs.  Sigh!  But
everything looks good and the few clear patches that came over got selected
and look OK when examined.  So I am just waiting for clear weather to start
beating last year's record runs.

Meanwhile, I am thinking about building a 480 Megapixel camera to go on a 4
meter telescope.  No, this is not something I am planning to give away.  It
is a Fermilab project that I am sitting in on.  It is fun to think about a
project where the CCDs alone cost over a Million.   It is really not all
that different from what I am doing.  The same problems.  Except there is
vacuum and cryogenics and ...  Now I know a little more than I did when I
started the Mark IVs.  So possibly I can be of help.

Tom 


> [Original Message]
> From: Michael Sallman <msallman@pro-ns.net>
> To: Tass <tass@listserv.wwa.com>
> Date: 3/21/2004 9:27:04 AM
> Subject: New Cepheid?
>
> Yeah, I thought that might wake you guys up. :-)
>
> I have been working on the database in preparation for this years data. 
> As I was working on cleaning up the W-S stats, I ran across this star:
>
http://sallman.tass-survey.org/servlet/markiv/template/TassPlot.vm?object_id
=6349369 
> (Plot)
>
http://sallman.tass-survey.org/servlet/markiv/action/DataDownload?position=5
7.1069+59.4424
> (Data)
> The star is GSC 3729-1127. 2MASS J-K is .895.
>
> Using both Patrick's PDM program and Period98, I get a period of approx. 
> 5 days. (there are a few slightly more significant frequencies, but they 
> are all greater than the Nyquist freq.)
> Could this be a Cepheid? The star is quite a bit redder than any of the 
> other Cepheids in the area.
>
> +---------+---------+---------+-------------+------------------+
> | id      | ra      | decl    | v_avg-i_avg | comments         |
> +---------+---------+---------+-------------+------------------+
> | 6318548 | 50.9481 | 59.3552 |       1.675 | AC Cam -- DCEP   |
> | 6318874 | 52.3567 | 60.4458 |       1.609 | AD Cam * -- DCEP |
> | 6369151 | 54.0833 | 62.2882 |       1.466 | AM Cam -- CEP    |
> | 6368297 | 56.5340 | 58.7840 |       1.291 | AB Cam * -- DCEP |
> | 6349369 | 57.1069 | 59.4424 |       1.928 | NULL             |
> | 6368677 | 58.5905 | 58.6535 |       1.459 | RW Cam * -- DCEP |
> +---------+---------+---------+-------------+------------------+
>
> Any thoughts?
>
> Mike
>
> P.S. I seem to recall a website that had plots of the Fourier 
> coefficients for different variables (Cepheid, RR Lyr, Delta Sct, etc.), 
> but I can't seem to find it again. Anyone know of such a site?
>
>