[Aavso-photometry] M67 Finder Chart

[Arne Henden]

Bill Perkins makes a good point that there are some known
variables in the m67 calibration available on the binary team
web site.  That calibration was done about 6 years ago, and
needs to be updated with new data as well as the removal
of variables discovered in the interim.  A couple of the variables
Bill mentions are very low amplitude, but there are lots of
stars in this field that can be used instead.  I'll see what I
can do in the next few weeks.  Thanks, Bill!
Arne

On Mon, Jan 19, 2009 at 11:47 PM, Bill Perkins
<billperkins at birdlandobservatory.net> wrote:
> Barbara,
>
> FYI,
>
> 4 of the 64 stars in the list of stars that Arne has generously made
> available to others prior to publication at
>
> http://binaries.boulder.swri.edu/binaries/fields/m67.html
>
> are variable stars (which takes nothing away from the measurements made at
> the time).
>
> Star 26 is EW Cnc
> Star 35 is HW Cnc
> Star 49 is Hv Cnc
> Star 55 is EV Cnc
>
> I found this by using VSP to find the M67 star field. There are other
> variable stars in this field, but no others that coincide with the
> measurements mentioned above. Good luck with your examination of this rich
> star field.
>
> Bill Perkins
>
> ----- Original Message ----- From: "Barbara G. Harris"
> <barbharris1 at hughes.net>
> To: <aavso-photometry at mira.aavso.org>
> Sent: Saturday, January 17, 2009 2:37 PM
> Subject: [Aavso-photometry] M67 Finder Chart
>
>
>> I would like to calculate transformation coefficients (finally).  Last
>> night
>> I imaged M67 through B,V,R,I filters.  Is there a source anywhere on the
>> AAVSO website that has a finder chart with magnitudes in each color for
>> M67?
>>
>>
>>
>> Barbara
>>
>> _______________________________________________
>>
>> Aavso-photometry mailing list
>> Aavso-photometry at mira.aavso.org
>> To change options or unsubscribe, goto
>> http://www.aavso.org/mailman/listinfo/aavso-photometry
>>
>
> _______________________________________________
>
> Aavso-photometry mailing list
> Aavso-photometry at mira.aavso.org
> To change options or unsubscribe, goto
> http://www.aavso.org/mailman/listinfo/aavso-photometry
>