[Aavso-photometry] Z Cam

[Stan Walker]

Hi Jerome,

I've never observed the star in question - can't see it from NZ - but most 
of the shorter period DNs have B-V colours near zero, often down to -0.1. 
U-B is a lot more negative but you're not doing that. They change a bit 
during outburst and some of the longer period ones are yellowish due to the 
greater amount of secondary light.

Regards,
Stan

----- Original Message ----- 
From: "Jerome Hudson" <hudsonjk at astound.net>
To: <aavso-photometry at mira.aavso.org>
Sent: Thursday, May 28, 2009 12:11 PM
Subject: [Aavso-photometry] Z Cam


> Hi,
>
> In responding to the alert notice on Z Cam, I've posted the
> following observation on Blue and Gold:
> #TYPE=Extended
> #OBSCODE=HJA
> #SOFTWARE=AIP4WIN 1.4.25
> #DELIM=,
> #DATE=JD
> #OBSTYPE=CCD
> #NAME,DATE,MAG,MERR,FILT,TRANS,MTYPE,CNAME,CMAG,KNAME,KMAG,AMASS,GROUP,CHART,NOTES
> Z 
> Cam,2454978.7029,10.902,0.012,B,YES,STD,108,11.160,94,10.235,na,1,1231ebd,na
> Z 
> Cam,2454978.7222,10.966,0.012,V,YES,STD,108,10.760,94,9.385,na,1,1231ebd,na
>
> I tried a series for approx 3/4 hour in V, @22s/frame, which showed Z 
> constant
> relative to its C and K stars.
>
> I just recently obtained a Johnson B filter, and did a cal on M67, so am
> attempting to transform my b,v to standards.  Am curious that Z Cam shows 
> so
> little color, in fact -0.06 - is this out in  left field?
>
> -Jerry Hudson (HJA)
>
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