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CCD Images - Session 174 (2007-02-04)

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Objects Session Notes
GK Per - Nova (1901)
U Gem - Dwarf Nova Variable
U Mon - Variable
Beta Mon / Struve 919 - Multiple Star
NGC 1907 - Open Cluster
RZ LMi - Cataclysmic variable star (ER UMa type)
DV UMa - Cataclysmic variable star (binary eclipsing, UGSU type)
ER UMa - Cataclysmic variable star (ER UMa type) 
Astrometric & Photometric Monitoring
- SS Cyg (dwarf novae)
- HIP 4429 (suspected variable)
- HIP 4429 (suspected variable)
- U And, W And (Mira variables)
- Z And (variables)
- BL Lac (BL Lac blazer)
- 5.5 hr session cut short by deteriorating sky conditions
- CCD operation of -25 degC (at 69% average cooling). .
- the other main objective was to acquire images for photometric monitoring of the variables stars U And, W And, SS Cyg and a suspected variable HIP 4429.
- opportunity was taken to acquire some exploratory images of U Gem, RZ LMi and DV UMa which may be added to future variable star monitoring.
- More Notes
-

GK Per - Nova (1901)

GK Per (Perseus) 
GK Per is the bright central star which had a nova eruption in 1901. 
A relic shell of material ejected during the eruption was 
the intended target for this image. Unfortunately the nova shell 
is not visible in the image.

 
CCD Image 
5 x 60s exposure (average combine), 2x2 binning, C filter,  
2007-02-04 20:15h UT (#174138-42)

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U Gem - Dwarf Nova Variable

U Gem (Gemini) 
U Gem is a dwarf nova which erupts every 
~100 days, rising from 14th to 9th magnitude

Estimated mag +13.5

 
CCD Image 
3 x 20s exposure (average combine), 2x2 binning, C filter,  
2007-02-04 20:47h UT (#174176-86)

 
U Gem - Approximate Colour

 
Approximate Colour CCD Image (LRGB)
Luminance: av 3 x 20s (C Filter),  Red: av 3 x 20s (R Filter)
Green : av 3 x 30s (V Filter), Blue : av 3 x 60s (B Filter)
2007-02-04 20:47h UT (#174176-89)

  
U Gem - Baseline Image
U Gem : Estimated V Mag +13.65

[ using reference Star : GSC 1375:804 
V Mag 11.27 from UCAC 2.0 ]

 
CCD Image 
3 x 30s (average combine), 2x2 binning, V Filter 
2007-02-04 20:47h UT (#174178-88)

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U Mon - Variable

U Mon  (Monoceros) 

 
CCD Image 
20s exposure, 2x2 binning, C filter,  
2007-02-04 21:24h UT (#174230)
 
U Mon - potential reference stars
 
CCD Image 
10s exposure, 2x2 binning, V filter,  
2007-02-04 21:22h UT (#174224)

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Beta Mon / Struve 919 - Multiple Star 

Beta Mon / Struve 919 (Monoceros) 

 
CCD Image 
20s exposure, 2x2 binning, C filter,  
2007-02-04 21:27h UT (#174235)
 
Beta Mon - detail
 
CCD Image 
[ Insert at 300% size ]
1s exposure, 2x2 binning, C filter,  
2007-02-04 21:29h UT (#174244)

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NGC 1907 - Open Cluster

NGC 1907  (Auriga) 

 
CCD Image 
3 x 60s exposure (average combine), 2x2 binning, C filter,  
2007-02-04 22:28h UT (#174314-16)

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RZ LMi - Cataclysmic variable star (ER UMa type)

RZ LMi (Leo Minor) 
RZ LMi is an ER UMa type star. These stars typically spend a third 
of their time in superoutburst with a supercycle of 20-50 days. Outside of superoutburst 
they typically pack in a rapid succession of normal outbursts, showing one every ~ 4 days

RZ LMi is the star with the shortest known supercycle, spending 
half its time in superoutburst and has time for only two normal outbursts in between.

Estimated magnitude of RZ LMi in following image is +16.5
which indicates a brightness lying between outbursts)

 
CCD Image 
3 x 60s exposure (average combine), 2x2 binning, C filter,  
2007-02-04 22:37h UT (#174319-25)

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DV UMa - Cataclysmic variable star (binary eclipsing, UGSU type)

DV UMa (Ursa Major) 
DV UMa is an eclipsing binary with deep eclipses of 1.5 mag 
or more with an orbital period of 0.08597 day. 
The eclipses lasted slightly less than 20 minutes.  
The star is of UGSU type and also shows superhumps modulations 
with periods that are slightly longer than the orbital period

The following image appears to show DV UMa in eclipse, 
since the star is seemingly below the magnitude limit of image (c. +16.5)

 
CCD Image 
3 x 60s exposure (average combine), 2x2 binning, C filter,  
2007-02-04 23:11h UT (#174343-47)
 
DV UMa starfield in V Filter

 
CCD Image 
3 x 60s exposure (average combine), 2x2 binning, C filter,  
2007-02-04 23:11h UT (#174343-47)

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ER UMa - Cataclysmic variable star (ER UMa type)

ER UMa (Ursa Major) 
ER UMa is the prototype ER UMa type star. These stars typically spend a third 
of their time in superoutburst with a supercycle of 20-50 days. Outside of superoutburst 
they typically pack in a rapid succession of normal outbursts, showing one every ~ 4 days

 
CCD Image 
60s exposure, 2x2 binning, C filter,  
2007-02-04 23:31h UT (#174370)

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Astrometric and Photometric Monitoring

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This Web Page: CCD Images - Session 174 (2007-02-04)
Last Updated : 2007-03-17
Site Owner : David Richards
Home Page : David's Astronomy Web Site