Pith Number

pith:NLDKBQCS

pith:2026:NLDKBQCS5USQT2254QC3364WA4

not attested not anchored not stored refs resolved

The Distribution of Blue Straggler Stars in the Color-Magnitude Diagrams of Old Open Clusters

Evan Linck, Robert D. Mathieu

Half of blue straggler stars in old open clusters sit in the final third of their main-sequence lifetimes because of helium enrichment during formation.

arxiv:2605.14187 v1 · 2026-05-13 · astro-ph.SR · astro-ph.GA

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\usepackage{pith}
\pithnumber{NLDKBQCS5USQT2254QC3364WA4}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

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

50% of BSSs have color-magnitude diagram locations corresponding to single stars in the final third of their main-sequence lifetimes. This build-up of BSSs near the TAMS is primarily, but not solely, driven by more massive BSSs. These findings indicate that helium enrichment of progenitor accretors leads to the prevalence of BSSs near the TAMS.

C2weakest assumption

The assumption that color-magnitude diagram positions and white-dwarf cooling ages directly trace evolutionary stages and formation times without significant contamination from unresolved binaries, photometric errors, or non-conservative mass transfer.

C3one line summary

Blue straggler stars in old open clusters predominantly appear near the terminal-age main sequence because mass transfer from asymptotic giant branch donors enriches their cores with helium.

References

296 extracted · 296 resolved · 12 Pith anchors

[1] Astronomy & Astrophysics , author = 2024 · doi:10.1051/0004-6361/202347499

[2] Acta Astronomica , author = 2012

[3] Acta Astronomica , author = 2011

[4] The Astrophysical Journal , author = 1995 · doi:10.1086/187855

[5] The Astrophysical Journal , author = 2025 · doi:10.3847/1538-4357/ade9bc

Formal links

2 machine-checked theorem links

Cited by

1 paper in Pith

Blue Straggler Stars in Old Open Clusters and the Kraft Break

Receipt and verification

First computed	2026-05-17T23:39:11.185203Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

6ac6a0c052ed2509eb5de405bdfb96070dcde3eeb12a8ec558329f1033d9ba66

Aliases

arxiv: 2605.14187 · arxiv_version: 2605.14187v1 · doi: 10.48550/arxiv.2605.14187 · pith_short_12: NLDKBQCS5USQ · pith_short_16: NLDKBQCS5USQT225 · pith_short_8: NLDKBQCS

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/NLDKBQCS5USQT2254QC3364WA4 \
  | 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: 6ac6a0c052ed2509eb5de405bdfb96070dcde3eeb12a8ec558329f1033d9ba66

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "7159980f109b1bc8190a07c6a0a639715ded001ce4773557a3fc45b541a9e8b3",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-05-13T23:10:12Z",
    "title_canon_sha256": "672ec1e49a7971cd05a8df22c1ec57dacd6594da77fc0b70c4d2916935d7ea7b"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.14187",
    "kind": "arxiv",
    "version": 1
  }
}