New ZZ Ceti Star: SDSSJ223726.86-010110.9
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New ZZ Ceti Star: SDSSJ223726.86-010110.9 1. Location • Stripe 82 ➔ 22h 24m < α J2000 < 04h 08m; -1.27 o < δ J2000 < 1.27 o , ≈ 290deg 2 2. Variability ∙ Minimum of 4 distinct-epoch imaging ∙ Distribution of multi-epoch photometric errors is Gaussian ∙ χ 2 ≈ 1 for non-variable objects ∙ χ 2 ≥ 3 for variable objects 3. Pulsation Properties One millimodulation amplitude (mma) corresponds to a 0.1% change in intensity. Harmonics Period (s) P Amplitude (mma) A Fundamenta l 740.8 2.1 81.2 2.5 First 368.9 1.3 32.6 2.5 Second 245.7 1.4 13.0 2.5 Michael A. Wolfe, STScI
description
New ZZ Ceti Star: SDSSJ223726.86-010110.9. 1. Location • Stripe 82 ➔ 22h 24m < α J2000 < 04h 08m; -1.27 o < δ J2000 < 1.27 o , ≈ 290deg 2 2. Variability ∙ Minimum of 4 distinct-epoch imaging ∙ Distribution of multi-epoch photometric errors is Gaussian - PowerPoint PPT Presentation
Transcript of New ZZ Ceti Star: SDSSJ223726.86-010110.9
New ZZ Ceti Star: SDSSJ223726.86-010110.9
1. Location• Stripe 82 ➔ 22h 24m < αJ2000 < 04h 08m; -1.27
o < δJ2000 < 1.27o, ≈ 290deg2
2. Variability∙ Minimum of 4 distinct-epoch imaging
∙ Distribution of multi-epoch photometric errors is Gaussian
∙ χ2 ≈ 1 for non-variable objects∙ χ2 ≥ 3 for variable objects
3. Pulsation Properties
One millimodulation amplitude (mma) corresponds to a 0.1% change in intensity.
Harmonics Period (s) P Amplitude (mma)
A
Fundamental
740.8 2.1 81.2 2.5
First 368.9 1.3 32.6 2.5
Second 245.7 1.4 13.0 2.5
Michael A. Wolfe, STScI
The non-sinusoidal light curve implies that this DAV is useful in studying convection in WDs.
Michael A. Wolfe, STScI
