[Aavso-photometry] V0567 Oph

[Shawn Dvorak]

Arne mentioned the script I wrote to pull ASAS data and submit it to the 
AAVSO.  It's a fairly simple Perl script that parses through an input 
list of stars and pulls off the ASAS data for each target star as well 
as suitable nearby comp and chk stars.  The comp and chk stars aren't 
necessary for using ASAS data since it's already reported in calibrated 
V mags, but the AAVSO input format requires it.  Using them was also a 
good check on the data.

I used the script to import the ASAS data for all of the Mira and Z And 
stars in the AAVSO programs and they worked pretty well for that.  The 
biggest problems I ran into were: poor fields that had few/no good comp 
and chk choices; and problems with mis-ids when stars were faint.  These 
cases required some manual interventions but most stars were processed 
without any manipulation.

Shawn


arne wrote:
> James Roe wrote:
>> Last night I was supporting a student project looking at V0567 Oph.  
>> We got
>> some good data and I submitted it to the data base (it was in VSX but 
>> not in
>> the validation file, but it is now I guess).  I looked the star up in 
>> the
>> ASAS3 database and found a ton of measurements which I used to 
>> specify a C
>> star in V (but no data in B nor Ic).  We took data in B and Ic but 
>> I'm not
>> sure how to prepare the data without C stars in these bands?  Advice 
>> please?
>>
>> Also, is there a way I can help get the ASAS data into the AAVSO data 
>> base
>> for this star?  Is this what data mining is all about?
>>
> We're working on an automated way to get ASAS data into the International
> Database.  Until then, contact Shawn Dvorak, who has scripts to
> pull off ASAS data on specific stars.
>
> V567 Oph looks like a field that I have not yet calibrated at NOFS
> nor SRO.  Therefore, you have to look for other calibration photometry.
> There is always Tycho2 to give you basic B and V photometry of
> nearby comparison stars. The TASS Mark IV patches photometric
> catalog will give you rough Ic magnitudes for your comparison stars.
> You can also use CMC14 or DENIS magnitudes and transform to obtain Ic.
> You can determine BVIc yourself via all-sky methods.  Finally, you
> can submit the raw differential data using the AAVSO extended format,
> identifying the comparison star that you used, and let a future
> researcher calculate its true magnitudes once the comparison
> star is properly calibrated.
>
> In a few months, you should be able to use APASS calibrations to
> take care of the entire problem.
> Arne
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