chara/npoi 2013 science & technology review chara classic ... · dither mirror 2 dither mirror...
TRANSCRIPT
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CHARA/NPOI 2013 Science & Technology Review
CHARA Classic/Climb Numbers.
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CHARA/NPOI 2013 Science & Technology Review
v1
v2
Output 2Output 1
Output 3
Dither Mirror 2
Dither Mirror 1 Compensator
Compensator
Beam SplitterBeam Splitter
Input A
Input B
Input C
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CHARA/NPOI 2013 Science & Technology Review
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CHARA/NPOI 2013 Science & Technology Review
Automated Data Reduction
• Automated editing – Fringe > 1.1 Noise Power • Took approximately 200 minutes to crunch. • V < 0 and V > 1 thrown away. • Not reliable for science. • K&H magnitudes extracted from 2MASS. • Stars without 2MASS data thrown away. • Includes both calibrators and science targets.
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CHARA/NPOI 2013 Science & Technology Review
Amount of Data
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CHARA/NPOI 2013 Science & Technology Review
K/H Mags are converted to a photon count.
• Uses numbers from Camping, Rieke & Lebofsky PASP 90, 896i (1995): For Mag 0 Star: • J Band 1.26 micron: 1603 Jy • H Band 1.60 micron: 1075 Jy • K Band 2.22 micron: 667 Jy
• 1 Jy = 1.51 x 107 Photons S-1 m-2 (dλ/λ)-1
• All data are calibrated to 1 second. • This assumes the NIRO readout mode behaves. • Camera Gain = 0.3, DQE = 60%.
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CHARA/NPOI 2013 Science & Technology Review
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System Visibilities are Corrected For Estimated Stellar Diameter
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CHARA/NPOI 2013 Science & Technology Review
Uncorrected result from last year:
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CHARA/NPOI 2013 Science & Technology Review
SNR ~ Vraw * sqrt(N)
Limit set so 2.5% of points are above the line.
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CHARA/NPOI 2013 Science & Technology Review
New Baseline Solution • The system records the OPLE demand positions and
current scope Alt/Az when fringes are found. • This is now automated for all beam combiners. • 134889 baseline solution data points were recorded. • The demand position is better for modeling than the
measured position. • The height of a scope is degenerate with its internal
path. • We use a different internal path for each POP
configuration to solve for telescope positions. • We then do a separate solution for internal path.
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Old Shutter Sequence Classic Climb
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This made the Math difficult: Classic
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CHARA/NPOI 2013 Science & Technology Review
This made the Math difficult: Climb
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CHARA/NPOI 2013 Science & Technology Review
New Shutter Sequence Classic Climb
This gives a direct measurement of the background power.
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CHARA/NPOI 2013 Science & Technology Review
CHARA Rocks!
Robby Krieger (The Doors)
Arthur Barrow And
Tommy Mars (The Zappa Band)