Bibliographic record
Abstract
New B , V , and I CCD photometry is presented for the intermediate-age open cluster NGC 6939. V , B - V and V , V - I color-magnitude diagrams (CMDs), which extend 4 mag fainter than previous CMDs, have been constructed. The CMDs show a clearly defined turnoff and well-populated red giant clump, suggesting a cluster age of at least 1 Gyr. A comparison between the clump stars of this cluster and those of the open cluster NGC 752 indicate a color excess and distance modulus of 0.33 ± 0.07 and 12.27 ± 0.41 mag, respectively. Examination of reddening maps and CMDs of different quadrants of the cluster suggest that variable reddening across the face of the cluster is present. Color excess values and distance moduli for four quadrants of the cluster range from 0.29 to 0.41 mag and 12.21 to 12.39 mag. Comparison between the V , B - V CMD and solar metallicity isochrones yield a cluster age of 1.6 ± 0.3 Gyr.
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".