[vsnet-chat 3752] Re: DELTA VELORUM photometry

["Stan Walker" <astroman@voyager.co.nz>]

Greetings, Sebastian and all,

I noted the two recommended stars for comparisons. They're a little too
faint as compared to the variable for CCD use on my system. I wondered about
BS 3447 (omicron), also iota and kappa. None are exactly the right spectral
type but I can't find any notes about variability.

I'm still looking for an easy way of reducing the signal input. Stopping
down the aperture creates problems which I'd rather avoid and neutral
filters are hard to come by out here. So I thought of trying the aluminium
window film which 3M claim has a fairly flat spectral response and is very
good optically. Anyone any thoughts on this? It comes in a variety of
densities but the 20% transmission variety - perhaps doubled - might be
useful.

At present I have a zero transmission blanket overhead but it may clear one
day!

Regards,
Stan



----- Original Message -----
From: Sebastián Otero <varsao@fullzero.com.ar>
Cc: <vsnet-chat@kusastro.kyoto-u.ac.jp>
Sent: Tuesday, November 07, 2000 10:51 AM
Subject: [vsnet-chat 3751] DELTA VELORUM photometry


> Thanks Brian for the corrections he sent.
> For photometrists, a good pair of stars for the job would be:
>
> HD 76653    V= 5.705   B-V= 0.48
> HD 76805    V= 4.685   B-V= -0.13
>
> And this is another visual observation at maximum:
>
> VELdelta    20001106.1715   1.95   OSE
>
> Best wishes to all.
>
> PS: Don't forget to check the star on the night of November 12 in order to
> rule out the 27.1 day period!
>
>
> Sebastian.
>
>

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