[vsnet-chat 4176] Re: [vsnet 2088] Tentative periods for BO Mus, RX Lep and EsB 365

[Thom Gandet <tgandet@mindspring.com>]

   It's a horse that should perhaps be beaten more frequently.  There
are many brighter variables (V<~8) for which the only (potential)
comparison stars are more than ~1 degree distant.  (The suspected
eclipsing binary Delta-1 Lyr and the important Herbig Be star V380
Cep come immediately to mind.)

   Wide field CCD imaging, even with a modest chip size, becomes
possible with small objectives, small f-ratios and short exposures.
For the visual observers, such images could provide charts which
closely reflect what is seen at the eyepiece.

   An ST-7E with a small aperture, short focus lens will be used here
in our long-term photometric monitoring program of Be/Gamma Cas stars,
the brighter symbiotic stars, and related objects.

   A good recent example of what could be done can be found in John P.
Gleason's glorious image of the Vela nebula taken with a Nikon 180mm
f/2.8 ED Lens and Steve Mandel's Wide Field Adaptor.  John's image is
at http://vsnet.celestialimage.com/page119.html.

Regards,
Thom Gandet


Brian Skiff wrote:
> 
>      This is probably beating a dead horse, but:  cases such as these argue
> again for using an ordinary 50mm camera lens with a CCD to take short
> exposures with a standard photometric filter, and doing straightforward
> photometry on the images.
> 
> \Brian

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                      Thomas L. Gandet, Director
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