ASTRONOMY BROWN BAG SEMINAR TIME SERIES ANALYSIS OF HR 1040 SEPTEMBER 16, 2008 DAVID CORLISS
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Transcript of ASTRONOMY BROWN BAG SEMINAR TIME SERIES ANALYSIS OF HR 1040 SEPTEMBER 16, 2008 DAVID CORLISS
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ASTRONOMY BROWN BAG SEMINARASTRONOMY BROWN BAG SEMINAR
TIME SERIES ANALYSISTIME SERIES ANALYSISOF HR 1040OF HR 1040
SEPTEMBER 16, 2008SEPTEMBER 16, 2008
DAVID CORLISSDAVID CORLISS www.wikisky.org
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OUTLINEOUTLINE
HR 1040HR 1040OBSERVATIONAOBSERVATIONA
L L METHODOLOGYMETHODOLOGY
CHALLENGESCHALLENGESTIME SERIES TIME SERIES STUDYSTUDY
FUTURE RESEARCHFUTURE RESEARCH
ROCKET
SCIENCE
www.wikisky.org
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Class: A0 Ia
Distance: 758 ± 250 pc
mv: 4.54, Mv: -7.1 (Variable ± 0.3)
Teff: 9730 ± 300 K
Mass: 19.3 ± 3.3 Mּס
Radius: 97 ± 2.4 Rּס
Terminal Velocity: 218 ± 44 kms-1
Escape Velocity: 233 ± 47 kms-1
Mass Loss: 8.5 ± 3 x 10-8 Mּס yr-1
Features: Irregular Variable, Mass Loss, HVA Events
HR 1040 – Basic Data
www.wikisky.org
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HR 1040 – CAM OB1 ASSOCIATION
Straizys, V. & Laugalys, V., 2007, Baltic Astronomy, 16, 167
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OBSERVATIONS: METHODOLOGYOBSERVATIONS: METHODOLOGY
RITTER OBSERVATORY
1.06 m, f/8 Ritchey – Chrétien Telescope
High-Resolution Échelle Spectrograph
CCD Camera (Prior to 2007)1200 x 800 pixels 22.5 x 22.5 μm
cooled to 140 K
Resolution ~ 26,000 near Hα
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A Digital Spectral Classification Atlas, R. O. Gray, ASU
OBSERVATIONS: SPECTRUMOBSERVATIONS: SPECTRUM
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OBSERVATIONS: HOBSERVATIONS: Hαα PROFILE PROFILEP Cygni Mass Loss P Cygni Mass Loss
Hα Region of P Cygni, N. Richardson, M.S. Thesis, 2006
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OBSERVATIONS: OBSERVATIONS: HHαα Profile in HR Profile in HR 10401040
Hα Region of HR 1040, N. D. Morrison, 1993
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OBSERVATIONS: OBSERVATIONS: High Velocity Absorption in HR High Velocity Absorption in HR
10401040
C. L. Mulliss, 1993
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OBSERVATIONS: OBSERVATIONS: High Velocity Absorption in HR High Velocity Absorption in HR
10401040
N. D. Morrison, 1993
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CHALLENGES
Telluric Water Vapor
Hα Region of Deneb, N. Richardson, M.S. Thesis, 2006
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CHALLENGESSparse and intermittent data
Northern Declination - Observations can be limited
REALLY! I STUDY HR
1040
I STUDYΒ ORIONIS
Complex Hα Profile
Large Distance Contributes to Uncertainties
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TIME SERIES ANALYSIS:TIME SERIES ANALYSIS:
PERIODICITY PERIODICITY
Strömgren Photometry of Deneb in Fall 1999, N. Richardson, M.S. Thesis, 2006
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TIME SERIES ANALYSIS:TIME SERIES ANALYSIS:
FORECASTINGFORECASTING
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TIME SERIES ANALYSIS:TIME SERIES ANALYSIS:CHAOS CHAOS
When change makes all the When change makes all the difference!difference!
U.S. AVERAGE - REGULAR GAS
1.82.02.2
2.42.62.83.03.2
3.43.63.8
Oct 10,2006
Jan 18,2007
Apr 28,2007
Aug 06,2007
Nov 14,2007
Feb 22,2008
Jun 01,2008
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TIME SERIES ANALYSIS:TIME SERIES ANALYSIS:
ARIMA MODELSARIMA MODELS
1,1,0 ARIMA 1,1,0 ARIMA MODELMODEL
SMOOTH DATASMOOTH DATA
0,1,1 ARIMA 0,1,1 ARIMA MODELMODEL
CHAOTIC DATACHAOTIC DATA
METRO DETROIT TESTSCORES VS INCOME
0
20
40
60
80
100
0 10 20 30 40 50
INCOME PER CAPITA ($1,000)
M.E
.A.P
. PAS
S / F
AIL
%
U.S. AVERAGE - REGULAR GAS
1.82.02.2
2.42.62.83.03.2
3.43.63.8
Oct 10,2006
Jan 18,2007
Apr 28,2007
Aug 06,2007
Nov 14,2007
Feb 22,2008
Jun 01,2008
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TIME SERIES ANALYSIS:TIME SERIES ANALYSIS:
CHANGES IN CHEMISTRYCHANGES IN CHEMISTRY
Hα Region of Deneb, N. Richardson, M.S. Thesis, 2006
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Opportunities for further research include:
FUTURE RESEARCH
Longer Time Series
New Objects
New mathematical Techniques
Chemical Composition
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High Velocity Absorption events are observed and appear to be associated with variations in luminosity
CONCLUSIONS
HR 1040 is an A0 Ia Supergiant Variable
HVA events may be periodic but this can not be verified with the data presently available – more observations over longer time periods are needed
P Cygni Hα profile indicates the presence of mass loss; Rate of loss is 8.5 ± 3 x 10-8 Mּס yr-1
Standard statistical techniques for Time Series Analysis such as ARIMA Models may be useful in understanding the behavior of HR 1040
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Bright Star Catalog, Fifth Edition, 1991 (19950214)
Corliss, D. J., 2008, UT Graduate Research Symposium
Fischer, W. J. & Morrison, N. D., 2001, PASP, 113, 821
Richardson, N., A Five–Year Spectroscopic and Photometric
Campaign on the Supergiant Star Deneb, M.S. Thesis, 2006
Kaufer et al. 1996, A&A, 305, 887
Kunasz, P. B., Morrison, N. D., Spressart, B. 1983, ApJ, 266, 739
Morrison, N. D., & Gordon, K. D., 1996, Bull. AAS, 27, 1312
Przybilla, N. et al., 2004, Proceedings IAU Symposium No. 224, DOI:
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Straizys, V, & Laugalys, V, 2007, Baltic Astronomy, 16, 167
Talavera, A. & Gomez de Castro, A. I., 1987, AA,181, 300T
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