A search for evolutionary period variations of Cepheids using the harvard plate stacks: II Carinae
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Bibliographic record
Abstract
We obtained 380 photographic brightness estimates for the long-period classical Cepheid II Car ( P = 64.4 days) from the plate stacks of the Harvard College Observatory. Combined with the published photoelectric and CCD observations, these data enable the construction of an O-C diagram covering 120 years. The O-C diagram is parabolic, making it possible for the first time to determine the quadratic light-curve elements and calculate the evolutionary rate of increase of the period, dP/dt = 719(±15) s/year (log( Ṗ/P ) = −4.64), in agreement with theoretical computations for the third crossing of the instability strip. The available data, reduced using the method described by Eddington and Plakidis, demonstrate the presence of small random period fluctuations that do not distort the evolutionary changes of the O-C residuals.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it