Re: GSC 748-1618 period

[Chris Lloyd <cl@astro1.bnsc.rl.ac.uk>]

Michael,

The most consistent period I can find is 0.777418 days and I guess it's an
RR Lyrae and not a W UMa for a change.

Chris


On Fri, 14 Feb 2003, Michael Koppelman wrote:

> So I'm working on GSC 748-1618. I have TASS data and I have my own
> data. When I use only my more recent data it looks like this:
>
> http://www.lolife.com/astronomy/gsc748-1618/7481618_phase_1.jpg
>
> While perhaps not the actual period, it is clearly related to the
> period.
>
> When I add all the data, which includes the TASS data and my earliest
> data, the same period looks like this:
>
> http://www.lolife.com/astronomy/gsc748-1618/7481618_phase_2.jpg
>
> It seems like maybe I'm just off by a factor of two or something, but
> I've tried every probably period between 0.5d and 3d and I can't find
> anything that makes all the data work.
>
> The data is here:
>
> http://www.lolife.com/astronomy/gsc748-1618/data_hjd.txt
>
> If you are interested.
>
> Thanks for any insights. It is possible the period is changing on the
> time scale of a year or so?
>
> Michael Koppelman
>
>