Message-ID: <328CDDD6.23E@mailhost.centrum.dk>
Date: Fri, 15 Nov 1996 13:17:46 -0800
From: Kaare Jensen <kssefys@mailhost.centrum.dk>
Reply-To: kssefys@mailhost.centrum.dk
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To: rwest@eso.org
Subject: AOL, Observing proposal
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Regards
Kaare Jensen

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Programme title: B and V photometry in NGC 362	

Abstract: 
We would like to obtain B and V filter observations of this globular 
cluster in order to construct a color/magnitude diagram. By obtaining several 
exposures separated in time, we also hope that we might discover some 
variable stars.

Submitted by: Astronomi Mellemniveau, Koege, Denmark

Position: 01h 03m 12s, -70d 55' (J2000) 
          Hopefully enough of center to avoid crowding.

Magnitudes:
Solar type stars should have (about) m = 19. So hopefully we can have some 
usefull images from this magnitude and upwards.

Exposures: 
1. Night: 3 exposures in B (filter 419) - 7 min, spaced by 1 hour.
          3 exposures in V (filter 420) - 5 min, spaced by 1 hour. 

2. Night: 3 exposures in B (filter 419) - 7 min, spaced by 1 hour.
          3 exposures in V (filter 420) - 5 min, spaced by 1 hour. 

Rationale:
Allthough we fear that the number of stars measurable will be too small we
still hope to construct color/mag diagram and maybe from this get a rough
idea of the age and distance of NGC 362. Comparisons could be made with
professional estimates and it could also be possible to compare results with
other AOL groups observations of other clusters. As a fall-back we hope that
by having several exposures spaced in time we could discover some variables  
(maybe even new ones?!)

Comments:
It is difficult for us to estimate the degree of crowding in the proposed 
field (offset from center is 4'). If a short test exposure could be made
and evaluated by the observer it would be nice. (On the other hand we also
need quite a few stars to construct a C-m diagram, so this must be a 
compromise). Exposures are best done in the beginning of the night at 
La Silla. We have not been able to find out if there are any standardstars
in the cluster, if not some standards must be observed, but they can 
hopefully be shared with other observers.

Telescope: Dutch 91 cm at La Silla with CCD.

Koege, November 15, 1996


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