Dynamical Mass Ratios of the Youngest Low-Mass Stars
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Dynamical Mass Ratios of the Youngest Low-Mass Stars
Gregory Mace Mentor: Lisa Prato
Northern Arizona UniversityPhysics and Astronomy
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This Project
• Goal: To measure mass ratios of very young binary stars.
• Why: To calibrate
the parameters used
in models of young star formation.
• How: High resolution IR
spectroscopy of young
spectroscopic binaries.
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Target Objects
• RX J0529.3+1210P= 462.54 days e=0.91 SpT= K7-M0
• NTTS 160814-1857P= 144.7 days e=0.26 SpT= K2
• NTTS 155808-2219P=16.93 days e=0.10 SpT=M3
All are pre-main sequence single-lined spectroscopic binaries.
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Introduction
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Introduction
• Why infrared?
• Flux Ratio Closer to Unity
Reference: Web http://www.astro.helsinki.fi/~lehtinen/Work/DC303.html
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Observations• Data from the instrument CSHELL on the 3-meter NASA IRTF Telescope.
CSHELL
NASA IRTF
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Observations
• Data from the instrument NIRSPEC on the Keck II Telescope.
NIRSPEC
Keck
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Spectral Changes
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NTTS 160814-1857
NIRSPECCSHELL
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Spectral Changes
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RX J0529.3+1210
NIRSPEC
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Parameter Determination• Two-Dimensional Cross Correlation
Spectrum Compared to Templates
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(Dashed line)
(Solid line)
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Mass Ratio Determination
• Mass ratio: q = - slope
• Center of Mass Velocity: = (y-intercept)/(1+q)
O. C. Wilson (1941)
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RX J0529.3+1210
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Results
• RX J0529.3+1210q= 0.93 ± 0.13 = 16.74 ± 1.69
km/s
periastron 0.12 AUapastron 2.56 AU
• NTTS 160814-1857Mass ratio and center of mass velocity to be determined.
• NTTS 155808-2219Mass ratio and center of mass velocity to be determined.
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Results
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Future ResearchRX J0529.3+1210
Future work:•Observe RX J0529.3+1210•Complete mass ratios for NTTS stars
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Conclusions• The mass ratio of RX J0529.3+1210 is near unity.
• RX J0529.3+1210 is the most eccentric pre-main-sequence spectroscopic binary know.
• RX J0529.3+1210 has 24m excess which my be evidence of a circumbinary debris disk.
• Planet formation in RX J0529.3+1210 is unlikely.
• Comparison of templates supports likelihood of lower mass ratios for NTTS stars.