New High-Amplitude SX Phœnicis (δ Scuti?) Star in the Direction of the Galactic Anti-Center: 2MASS 06451725 + 4122158
Bibliographic record
Abstract
The results of extensive time-series photometry of a new variable star, 2MASS 06451725 + 4122158, are presented. The B , V observations (over 4000 individual measurements) were made over 23 nights between 2006 and 2007. To investigate the star's physical characteristics additional Strömgren photometric observations ( uvbyH β ) were made on another four nights in 2007 and 2009. Thirteen frequencies were found from a multifrequency analysis of the V and B photometry. All but two of the frequencies, 19.99716 cycles day -1 (corresponding to the pulsation period of 0.0500071 day) and 25.84662 cycles day -1 (0.0386898 day), have been identified as combination frequencies. The ratio of the two frequencies, f 1 / f 3 = 0.77369, and their pulsation constants, Q ( f 1 ) = 0.034 and Q ( f 3 ) = 0.026, are well matched with theoretical values of the fundamental and the first-overtone radial modes. But the phase shift of f 3 was estimated to be a negative value, in contrast to that of f 1 to be positive, suggesting that f 3 may be a nonradial mode. The period versus amplitude diagram shows that the star has pulsational properties similar to those of high-amplitude SX Phœnicis stars. We obtained its photometric properties from the Strömgren indices: a metal abundance of [Fe/H] = -0.6 dex, an absolute magnitude of M V = 2.7 mag, a distance of ∼1.6 kpc in the direction of the Galactic anticenter from the Sun, and a vertical distance from the Galactic plane of ∼0.45 kpc. The tangential velocity of 78 km sec -1 , which was estimated from the proper motion and the distance, gives us a hint that the star may have high-space motion. Considering these observational properties, we suggest that this new variable is a field SX Phœnicis-type star, although its metallicity value seems not to be low enough for matching the metallicity versus period relation. Future spectroscopic studies would be required to obtain the metallicity more accurately.
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 | 0.000 | 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".