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Cousins E Region photometry

Mark__Blackford
Affiliation
Variable Stars South (VSS)
Fri, 09/19/2014 - 11:11

Hi All,

Starting back in the 1960's (?) Alan Cousins and others in South African used photoelectric photometry to establish the UBV(RI)c standards in the Harvard E Regions. Does anyone know what the photometer entrance aperture size was in arcseconds? Cheers,

Mark Blackford

olichris
Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 09/19/2014 - 13:26
good morning Mark.I worked

good morning Mark.

I worked last year with several documents of that time drifting cumulus magnitudes for M 7and NGC 6530, and if I remember correctly, they used 15 ", I keep those papers in the PC, this are the address of two of them.

http://articles.adsabs.harvard.edu/full/1957ApJ...125..636W

http://articles.adsabs.harvard.edu/full/1959BAN....14..265K

As they say there, and more references samples.

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HQA
Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 09/19/2014 - 13:35
e-region

Hi Mark,

The E-region observations were done using a 40-arcsec aperture.  Here is one of Cousins' papers that actually mentions the aperture size:

http://articles.adsabs.harvard.edu/full/1983SAAOC...7...36C

Such a large aperture (today's standards) was acceptable because these are all bright stars.

Arne

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Mark__Blackford
Affiliation
Variable Stars South (VSS)
Fri, 09/19/2014 - 22:36
E Region photometer

Hi Oliver and Arne,

thanks for the references. Cheers,

Mark

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