Mode identification from monochromatic amplitude and phase\n variations for the rapidly pulsating subdwarf B star EC 20338−1925
Bibliographic record
Abstract
\n We obtain time-series spectrophotometry observations at the VLT with the aim of\n partially identifying the dominant oscillation modes in the rapidly pulsating subdwarf B\n star EC 20338−1925 on the basis of monochromatic amplitude and phase variations. \n From the data gathered, we detect four previously known pulsations with periods near 147,\n 168, 126 and 140 s and amplitudes between 0.2 and 2.3 % of the star’s mean brightness. We\n also determine the atmospheric parameters of EC 20338−1925 by fitting our non-LTE model\n atmospheres to an averaged combined spectrum. The inferred parameters are\n Teff = 34153 ± 94 K, log g = 5.966 ± 0.017\n and log N(He)/N(H) = −1.642 ± 0.022, where the\n uncertainty estimates quoted refer to the formal fitting errors. Finally, we calculate the\n observed monochromatic amplitudes and phases for the periodicities extracted using\n least-squares fitting to the light curves obtained for each wavelength bin. \n These observed quantities are then compared to the corresponding theoretical values\n computed on the basis of dedicated model atmosphere codes and also taking into account\n non-adiabatic effects. We find that the quality of the data is sufficient to identify the\n dominant pulsation at 146.9 s as a radial mode, while two of the lower amplitude\n periodicities must be low-degree modes with ℓ = 0−2. This is the first\n time that monochromatic amplitudes and phases have been used for mode identification in a\n subdwarf B star, and the results are highly encouraging. \n
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How this classification was reachedexpand
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 | 0.000 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".