Probing the Photosphere/Wind Connection in Hot Stars with a Long-Exposure Chandra Observation of Zeta Puppis: X-Ray and Optical Variability
Bibliographic record
Abstract
Many previous studies of ζ Puppis (O4I(n)fp) at a variety of wave bands have reported periodic variability for this star. These studies found periods ranging from less than a day up to approximately 5 days, with much recent interest centered on the variability with a period of 1.78 days. We are using time-resolved data for Zeta Puppis from the High Energy Transmission Grating/ACIS-S instrument on the Chandra spacecraft to investigate the variability of this star in the X-ray band. The X-ray data was obtained during the following three intervals: July/August 2018 (464.0 ks), January/February 2010 (74.7 ks), and July/August 2019 (274.4 ks), for a total of 813.1 ks. In this study we concentrate on the temporal behavior of broad-band X-ray spectral regions. These bands are chosen to be wide enough to achieve adequate count rates in the short time intervals required to investigate periodic signals on the time scales described above. We compare this X-ray data with nearly contemporaneous high precision optical space photometric monitoring performed by the BRITE optical satellite array (including some corroborative data from TESS) to explore connections between the star's photosphere and its strong outflowing wind.
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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 | 0.002 |
| 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".