p-type pulsators on the main sequence of hr diagram gyöngyi kerekes corot-day budapest march, 2007
DESCRIPTION
Comparison TypePeriod Amplitude (in magnitude) Spectral type β Cephei3-8 hours B2-B5 δ Scuti1-3 hours A0-F5TRANSCRIPT
![Page 1: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/1.jpg)
P-type pulsators on the main sequence of HR Diagram
Gyöngyi KerekesCOROT-day Budapest March, 2007
![Page 2: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/2.jpg)
HRD
δ Scuti
β Cephei
SPB
γ Doradus
![Page 3: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/3.jpg)
Comparison
Type Period Amplitude (in magnitude)
Spectral
type
β Cephei 3-8 hours 0.01-0.8 B2-B5
δ Scuti 1-3 hours 0.03-0.9 A0-F5
![Page 4: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/4.jpg)
δ Scuti HD 170782
• Vmag = 7.81• Spectral type: A2• Outside of the instability strip, blue
edge• Reopens the problem of variability
![Page 5: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/5.jpg)
Whitening
1
2
3 4 5 6
123456
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Fitting
![Page 7: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/7.jpg)
Frequencies of HD 170782Frequenc
y(cycle/
day)
Amplitude(magnitude) Phase Noise
(S/N)
2.9 0.0081 0.83 18.794.1 0.0064 0.45 14.9125.5 0.0031 0.63 8.8413.2 0.0026 0.02 5.97.8 0.0020 0.33 4.2
Frequency
(cycle/day)
Amplitude(magnitude) Phase Noise
(S/N)
2.9 0.0081 0.83 18.794.1 0.0064 0.45 14.9125.5 0.0031 0.63 8.8413.2 0.0026 0.02 5.97.8 0.0020 0.33 4.2
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β Cephei stars
• Known since 1902• 10-20 solar masses• Main pulsation modes radial • But non-radial pulsations also detected• Large fraction is multiperiodic• Frequency spectrum is not too dense
modelling becomes possible• Very interesting from astroseismologic
point of view
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β Cephei HD 180642
• Main target of the first COROT long run• Vmag = 8.3• Spectral type: B 1.5
![Page 10: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/10.jpg)
Whitening1
2
3
4 5 6 7
1234567
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Fitting
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FrequenciesFrequenc
y(cycle/
day)
Amplitude(magnitude
)Phase Noise
(S/N)
5.49 0.037 0.83 36.0150.43 0.010 0.48 10.6599.97 0.009 0.12 8.8040.35 0.005 0.98 5.351
8.81 0.005 0.54 5.524
16.88 0.004 0.91 4.59
Frequency
(cycle/day)
Amplitude(magnitude
)Phase Noise
(S/N)
5.49 0.037 0.83 36.0150.43 0.010 0.48 10.6599.97 0.009 0.12 8.8040.35 0.005 0.98 5.351
8.81 0.005 0.54 5.524
16.88 0.004 0.91 4.59
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Conclusions• Main obtained frequencies:
• Trends in light curves↓
Further cleanings are required
• HD 170782 belongs to small amplitude δ Scutis → maybe more modes are excited → COROT’s task to investigate if there are more modes
δ Scuti HD
170782
25.513.2
7.8
β Cephei
HD 180642
5.59.978.81
16.88
![Page 14: P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007](https://reader036.vdocuments.mx/reader036/viewer/2022062401/5a4d1b277f8b9ab059997aa7/html5/thumbnails/14.jpg)
Thank you for your attention!