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CCD Images - Session 32 (2002-11-24)

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RU PegRX And | RW Tri | RV Tri | BX And | S Peg |
 
> Notes from CCD Session 32
   
This page shows results of variable star monitoring from 2002-10-03 till 2002-11-24.  The Project has continued beyond this data and rough light curves for period up until Dec 2002  is shown on Variable Stars Project Page

Variable Stars 

25 variables in Pegasus, Andromeda, Lacerta and Triangulum were imaged using Automated Scripting (see Scripting).

6 of these variables were imaged  through the evening at approximately 25 minute intervals in an attempt to track variations in short-period variables. 

19 of these variables were imaged as part of an ongoing project to  track changes in longer period, mainly Mira type variables. (these variables were previously imaged on 2002-10-03 , 2002-10-23 and 2002-11-10 - see base line images).

Magnitudes were determined using CCDSoft , using offset Reference Stars (base line images).  Data was imported into Excel and compared with Magnitude estimates listed on VSNET [ http://vsnet.kusastro.kyoto-u.ac.jp/vsnet ].

Results were generally promising.  Of the short-period variables observed 3 displayed distinct variation during the observing interval ( RW Tri , RV Tri , BX And ) and some the longer period variables showed good results e.g.  RU Peg , but the brightness of many of the Mira-type variables appear to have been significantly overestimated. (eg S Lac & S Peg), possibly due to discrepancy between visual estimates and my CCD estimates made without a IR Blocking filter.

[ The underlying purpose of this project is to gain experience in variable star work using CCD camera and practice and refine my techniques in order to attempt to detect the transiting Jupiter mass short period extrasolar planet.(HD 209458-b) which causes a 1.7% dimming of HD209458 every 3.5 days which lasts for about 3 hours. The dimming has been detected by Castellano and Laughlin using almost identical equipment to me (i.e 8" telescope and ST-7E CCD camera) ]

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RU PEG

Good results were obtained for RU Peg,  with data results consistent with magnitude trends on VSNET

 

Light Curve data for RU Peg  (Pegasus)
Image
 
Animated GIF image showing reduction in brightness of RU Peg, between
images on 2002-10-03 (Mag +11.4) and 2002-11-24 (Mag +12.6), an interval of  52 days.
Image
2002-10-03  22:40h UT,   3 x 5 sec median combine, (#28065-67)
2002-11-24  20:21h UT,   3 x 5 sec median combine, (#32114-16)

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RX And

Animated GIF image showing 3 magnitude change in brightness of RX And from 
2002-10-03 to 2002-11-24

[ Catalog data :  UGZ-type variable, period (14) days ]
Image
Sequence of 4 CCD frames,  10 sec exposures taken on
2002-10-03 (#28200), 2002-11-07 (#30039),
2002-11-10 (#31008), 2002-11-24 (#32017)
Image

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RW TRI

RW Tri, reference image, 15 sec exposure (north down)
Image
2002-11-24  20:52h UT
CCD Image, 15 sec exposure (2x2 binning)
11.4 x 7.6 arc min  (#32178)
Light Curve Data for RW TRI
[ Catalog Data : EA/WD+Nl,  Period 5.565 hours , 12.5 to 15.6 range]
Image
 15 sec exposures taken in groups of 3 at approximately 25 minute intervals
2002-11-24 

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RV TRI

RV Tri, reference image
Image
2002-11-24  21:00h UT
CCD Image, 15 sec exposure (2x2 binning)
11.4 x 7.6 arc min  (#32191)
Light Curve Data for RV TRI
[ Catalog Data : EA/SD ,  Period 18.088 hours, 11.5 to 13.3 range ]
Image
 15 sec exposures taken in groups of 3 at 
approximately 25 minute intervals, 2002-11-24 

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BX AND

BX And (Andromeda)
reference image, 5 sec exposure (north down)
Image
2002-11-24  21:07h UT
CCD Image, 1 5 sec exposure (2x2 binning)
11.4 x 7.6 arc min  (#32201)
Light Curve Data for BX AND
[ Catalog Data : EW/DW:  Period 14.623 hours, 8.9 to 9.57 range ]
Image
 5 sec exposures taken in groups of 3 at approximately 25 minute intervals
2002-11-24 

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S LAC

S Lac (Lacerta)
reference image from 2002-10-03, 10 sec exposure (north down)
Image
2002-10-02  23:06h UT
CCD Image, 3 x 10 sec exposure (2x2 binning)
11.4 x 7.6 arc min  (#28119-21)
Light Curve Data for S Lac
Showing noticable discrepancy between my CCD magnitude estimates and VSNET data
(Is this due to significant IR (Infra-red) from S Lac -  I'm not using any IR blocking filter)
Image

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S PEG

S Peg (Pegasus)
reference image from 2002-10-03,  5 sec exposure (north down)
Image
2002-10-02  22:21h UT
CCD Image, 3 x 5 sec exposure (2x2 binning)
11.4 x 7.6 arc min  (#28026-28)

Light Curve Data for S Peg
Showing noticable discrepancy between my CCD magnitude estimates and VSNET data
(Is this due to significant IR (Infra-red) from S Peg -  I'm not using any IR blocking filter)
Image
 

This page shows results of variable star monitoring from 2002-10-03 till 2002-11-24.  The Project has continued beyond this data and rough light curves for period up until Dec 2002  is shown on Variable Stars Project Page

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This Web Page: CCD Images - Session 32 (2002-11-24)
Last Updated : 2015-05-16
Site Owner : David Richards
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