DETECTION OF WHITE DWARF COMPANIONS TO BLUE STRAGGLERS IN THE OPEN CLUSTER NGC 188: DIRECT EVIDENCE FOR RECENT MASS TRANSFER
Bibliographic record
Abstract
Several possible formation pathways for blue straggler stars have been\ndeveloped recently, but no one pathway has yet been observationally\nconfirmed for a specific blue straggler. Here we report the first\nfindings from a Hubble Space Telescope Advanced Camera for Surveys/Solar\nBlind Channel far-UV photometric program to search for white dwarf\ncompanions to blue straggler stars. We find three hot and young white\ndwarf companions to blue straggler stars in the 7 Gyr open cluster NGC\n188, indicating that mass transfer in these systems ended less than 300\nMyr ago. These companions are direct and secure observational evidence\nthat these blue straggler stars were formed through mass transfer in\nbinary stars. Their existence in a well-studied cluster environment\nallows for observational constraints of both the current binary system\nand the progenitor binary system, mapping the entire mass transfer\nhistory.
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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 | 0.001 | 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 | 0.001 | 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".