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Coordinates (J2000.0):
RA = 05h 13m 51.4s
DEC = -69° 51' 48"
Brightness:
V = 16.5 - 17.5
Finding chart:
RX J0513.9-6951 = star "V"=0513
BKG = background region
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| V image |
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R image
SMARTS
1.0 m +CCD
left only part of whole frame.
For whole frame click on image
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B image
SMARTS
1.0 m +CCD
left only part of whole frame.
For whole frame click on image
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Differential V- and R-filter magnitudes
(RX J0513.9-6951 - comparison)
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star
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filter |
optical bright
state
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optical low
state
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remarks |
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1
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V
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0.3 ... 0.7
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0.9 ... 1.4
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blend of 2 stars,
but closest in color to 0513 |
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R
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0.4 ... 0.8 |
1.0 ... 1.5 |
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2
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V
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0.2 ... 0.6
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0.8 ... 1.3
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1.3 mag redder than 0513 |
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R
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3
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V
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-0.1 ... 0.3
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0.5 ... 1.0
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1.0 mag redder than 0513 |
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R
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4
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V
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-0.8 ...-0.4
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-0.2 ... 0.4
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1.3 mag redder than 0513 |
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R
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Optical low states last from ~30 days to ~50 days and are separated by optical bright states lasting from ~70 days to ~150 days.
Optical monitoring:
SMARTS
CHILE-04B-0251 (Mennickent):
B filter 600 sec, R filter 420 sec every night
CHILE-05A-0141 (Mennickent): actual program
B filter 450 sec, R filter 270 sec every night
Previous monitoring
V-filter CCD observations every 2-4 days
Trigger criterium: Differential magnitudes fall into the range of the optical low state as given in the table.
References for light curves:
Cowley et al. 2002, AJ, 124, 2233
Reinsch et al. 1996, A&A, 309, L11
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