<i>EUVE</i>Observations of Hercules X‐1 during a Short High‐State Turn‐on
Bibliographic record
Abstract
Observations of Hercules X-1 by the Extreme Ultraviolet Explorer ( EUVE ) covering low state and the early part of the short high state are reported here. This is the first EUV observation of this part of the 35 day cycle of Her X-1. The low-state portion of the EUV light curve (prior to the start of the short high state) has similar properties as that following the end of the short high state . This is evidence that the low-state EUV emission is primarily due to EUV reflection from the companion star HZ Her. The EUV light curve during the short high state is pulsed and closely resembles the average 2-12 keV X-ray short high-state light curve, indicating that the EUV emission, like the X-ray emission, originates near the neutron star. The short high-state EUV spectrum is consistent with a blackbody of temperature ≃0.13 keV and radius ≃230 km. The short high-state EUV spectrum and pulse shape are similar to that in the soft X-rays (0.1-1 keV). The most likely origin of the EUV emission is reprocessed X-rays from the inner edge of the accretion disk, and the radius of the inner edge of the accretion disk is likely to be small, consistent with that determined from analysis of the X-ray pulse shape evolution.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".