Pith Number

pith:YZURUOWR

pith:2026:YZURUOWRODANSACLU4W4G3SD37

not attested not anchored not stored refs resolved

Photometric Identification of Unresolved Binary Stars in Nearby Open Star Clusters

Anastasiia Plotnikova, Anton F. Seleznev, Giovanni Carraro, Varvara O. Mikhnevich

Empirical isochrones revise binary fraction estimates downward in open clusters.

arxiv:2604.20722 v1 · 2026-04-22 · astro-ph.GA · astro-ph.SR

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\pithnumber{YZURUOWRODANSACLU4W4G3SD37}

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Record completeness

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2 Internet Archive

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4 Citations open

5 Replications open

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The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

We show that this is an effective approach to exploring a wider primary-mass interval, in particular for the region of low-mass sources. The binary fraction estimate lies in the range 0.16 - 0.36 and 0.21 - 0.44, depending on the adopted method, and show that in previous studies the binary fraction was overestimated.

C2weakest assumption

That the empirical isochrones constructed from the observed data accurately represent the sequence of single stars without contamination from unresolved binaries or other effects, and that the photometric separation in the (H-W2)-W1 versus W2-(BP-K) diagram reliably identifies binaries across the mass range.

C3one line summary

Empirical isochrones in photometric diagrams enable identification of unresolved binaries in eight nearby open clusters, yielding binary fractions of 0.16-0.44 and mass ratio modes around 0.4-0.8.

References

70 extracted · 70 resolved · 1 Pith anchors

[1] S., & Albrow, M 2025 · doi:10.1093/mnras/stae2636

[2] Maia, F. F. S. 2025, arXiv e-prints, arXiv:2504.06362, doi: 10.48550/arXiv.2504.06362 2025 · doi:10.48550/arxiv.2504.06362

[3] Corradi, W. J. B. 2023, MNRAS, 522, 956, doi: 10.1093/mnras/stad1038 Astropy Collaboration, Robitaille, T. P., Tollerud, E. J., et al. 2013, A&A, 558, A33, doi: 10.1051/0004-6361/201322068 Astropy Col 2023 · doi:10.1093/mnras/stad1038

[4] A., et al., 2011, @doi [ ] 10.1111/j.1365-2966.2011.18706.x , http://adsabs.harvard.edu/abs/2011MNRAS.417.1621D 417 2012 · doi:10.1111/j.1365-2966.2011.19955.x

[5] 1990, MNRAS, 245, 15, doi: 10.1093/mnras/245.1.15 1990 · doi:10.1093/mnras/245.1.15

Cited by

1 paper in Pith

Hot Degenerate Components in Blue Stragglers: A Multi-Wavelength SED Analysis of Nine Open Clusters with Swift/UVOT

Receipt and verification

First computed	2026-06-08T01:04:05.343831Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

c6691a3ad170c0d9004ba72dc36e43dfdee60e366390bf1295ea96898c22904e

Aliases

arxiv: 2604.20722 · arxiv_version: 2604.20722v1 · doi: 10.48550/arxiv.2604.20722 · pith_short_12: YZURUOWRODAN · pith_short_16: YZURUOWRODANSACL · pith_short_8: YZURUOWR

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/YZURUOWRODANSACLU4W4G3SD37 \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: c6691a3ad170c0d9004ba72dc36e43dfdee60e366390bf1295ea96898c22904e

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "da193bdb03efb5e6eb4672d374e43a463d6e72064007b022eea297c1a0d14e1e",
    "cross_cats_sorted": [
      "astro-ph.SR"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-22T16:07:28Z",
    "title_canon_sha256": "879503d3cc39bc0849e9a0b66a8145fd1c2717148e39ee51490908b9613f4117"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.20722",
    "kind": "arxiv",
    "version": 1
  }
}