The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is...
Transcript of The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is...
![Page 1: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/1.jpg)
The O-C diagram
• O-C: Observed time – Calculated time
Period is correct and constant.
![Page 2: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/2.jpg)
The O-C diagram
Period is incorrect but constant.
Period is changing (increasing), e.g., due to evolution.
![Page 3: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/3.jpg)
The O-C diagram
Abrupt change from one constant period to another, e.g., in the RR Lyrae star SZ Hya.
Who knows ???
![Page 4: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/4.jpg)
The relation between period changes and O-C
![Page 5: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/5.jpg)
The relation between period changes and O-C
![Page 6: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/6.jpg)
The relation between period changes and O-C
![Page 7: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/7.jpg)
The relation between period changes and O-C
![Page 8: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/8.jpg)
O-C and period changes
![Page 9: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/9.jpg)
O-C and period changes
![Page 10: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/10.jpg)
O-C and period changes: some examples
![Page 11: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/11.jpg)
O-C and period changes: some examples
Note: We started at the bottom of the curve!
![Page 12: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/12.jpg)
Polaris - Period always increasing except for an unusual “glitch” around 1965
![Page 13: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/13.jpg)
Polaris – amplitudes near “glitch” around 1965
Amplitudes from VR – filled circles
Pe, pg, visual photometry - open circles (See Turner 2009)
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Frequency changes of the Delta Scuti star 4 CVn over 40 years
![Page 15: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/15.jpg)
O-C changes of the
Delta Scuti star
KIC 8054146
![Page 16: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/16.jpg)
O-C and period changes: some examples
G117-B15A: the most stable optical clock known (Kepler et al. 2005, ApJ 634, 1311)
Note: period change due to proper motion (Pajdosz 1995, A&A 295, L17)
![Page 17: The O-C diagrammikemon/FRI/OmC.pdfThe O-C diagram Period is incorrect but constant. Period is changing (increasing), e.g., due to evolution.](https://reader034.fdocuments.in/reader034/viewer/2022050222/5f67717b0399c7574028bad6/html5/thumbnails/17.jpg)
O-C and period changes: some examples
The pulsating subdwarf V391 Peg
Nature 449, 189 (2007)
Planet: 3 Jupiter masses, 1.7 AU, 3.2 yr period