Pith Number

pith:WU7ALNH5

pith:2026:WU7ALNH5P4C5PIOGTPQNOK6S2P

not attested not anchored not stored refs resolved

Photometric metallicity of Galactic RR Lyrae stars in the Gaia DR3 era

Harinder P. Singh, Mahiguhappriyaprakash, Nitesh Kumar, Susmita Das

A new linear relation from Gaia G-band data estimates RR Lyrae metallicities with zero bias and 0.26 dex scatter using period and Fourier phase.

arxiv:2605.13811 v2 · 2026-05-13 · astro-ph.SR · astro-ph.GA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{WU7ALNH5P4C5PIOGTPQNOK6S2P}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

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

Our best fit relation is [Fe/H] = (-6.93 ± 0.58) - (6.04 ± 0.37)P + (1.65 ± 0.11)φ31. ... achieving a negligible bias of 0.00 dex and an empirical RMS scatter of 0.26 dex.

C2weakest assumption

The 72 fundamental-mode RR Lyrae stars selected after visual light-curve inspection form a representative sample whose spectroscopic metallicities can serve as unbiased ground truth for the full Galactic population across periods and metallicities.

C3one line summary

New G-band relation [Fe/H] = -6.93 - 6.04P + 1.65 φ31 calibrated on 72 RR Lyrae stars with spectroscopic anchors, yielding 0.00 dex bias and 0.26 dex RMS scatter.

References

48 extracted · 48 resolved · 16 Pith anchors

[1] The RR Lyrae Period-Luminosity Relation. I. Theoretical Calibration · doi:10.1086/422916

[2] Theoretical insights into the RR Lyrae K-band Period-Luminosity relation 2001 · doi:10.1046/j.1365-8711.2001.04655.x

[3] VJHK observations of the RR Lyrae star VY Serpentis · doi:10.1093/mnras/216.4.873

[4] The RR Lyrae Period - K Luminosity relation for Globular Clusters: an observational approach 2006 · doi:10.1111/j.1365-2966.2006.10962.x

[5] On the distance of the globular cluster M4 (NGC 6121) using RR Lyrae stars: I. optical and near-infrared Period-Luminosity and Period-Wesenheit relations · doi:10.1088/0004-637x/799/2/165

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-18T02:44:15.394430Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

b53e05b4fd7f05d7a1c69be0d72bd2d3dd9f0326770015482d2b2d20011f53fe

Aliases

arxiv: 2605.13811 · arxiv_version: 2605.13811v2 · doi: 10.48550/arxiv.2605.13811 · pith_short_12: WU7ALNH5P4C5 · pith_short_16: WU7ALNH5P4C5PIOG · pith_short_8: WU7ALNH5

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/WU7ALNH5P4C5PIOGTPQNOK6S2P \
  | 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: b53e05b4fd7f05d7a1c69be0d72bd2d3dd9f0326770015482d2b2d20011f53fe

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "518659088adebe75584c70bedc72eafb5fe171854bfcbc273aa04791a7878a38",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-05-13T17:38:38Z",
    "title_canon_sha256": "2cb7fc74b6aa58fad1c11323076f12fa4a052db042494240f701f0a1dfdcab72"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13811",
    "kind": "arxiv",
    "version": 2
  }
}