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Cousins E Region photometry

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.