Pith Number

pith:GZY3T52P

pith:2026:GZY3T52PEZXQ4XCKSTCXNGOLNT

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Full non-LTE multi-level radiative transfer II. The case of a 5-level Ca ii atom with broadened excited levels

F. Paletou, M. Sampoorna, T. Lagache

For Ca II H&K and infrared triplet lines in a simplified atmosphere, standard non-LTE with partial redistribution accurately models line formation and makes full non-LTE unnecessary.

arxiv:2605.13374 v1 · 2026-05-13 · astro-ph.SR

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Claims

C1strongest claim

Under the conditions studied, for this particular atomic model and for a simplified atmosphere, we find that the standard NLTE with partial redistribution is sufficient to describe the formation of Ca II spectral lines. The more exact treatment of FNLTE is unnecessary in the case of Ca II H & K, and infrared triplet lines, even when accounting for velocity-changing collisions.

C2weakest assumption

The assumption that the simplified atmosphere model and the specific physical conditions (including the treatment of velocity-changing collisions) are representative enough to conclude that FNLTE is unnecessary for Ca II lines in general.

C3one line summary

A new numerical method for full non-LTE multi-level radiative transfer with broadened levels shows that standard NLTE with partial redistribution is sufficient for Ca II spectral lines in the studied simplified case.

References

39 extracted · 39 resolved · 0 Pith anchors

[1] 1987, JQSRT, 38, 427 1987

[2] Avrett, E. H. 1968, in Resonance Lines in Astrophysics, eds. R. G. Athay, J. Mathis, A. Skumanich (Boulder: NCAR), 27 1968

[3] 1997 a , , 328, 706 1997

[4] 1997 b , , 328, 726 1997

[5] 1986, JQSRT, 35, 303 1986

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-18T02:44:47.930636Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

3671b9f74f266f0e5c4a94c57699cb6ceaf1185c29bc38ba7837867057572919

Aliases

arxiv: 2605.13374 · arxiv_version: 2605.13374v1 · doi: 10.48550/arxiv.2605.13374 · pith_short_12: GZY3T52PEZXQ · pith_short_16: GZY3T52PEZXQ4XCK · pith_short_8: GZY3T52P

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/GZY3T52PEZXQ4XCKSTCXNGOLNT \
  | 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: 3671b9f74f266f0e5c4a94c57699cb6ceaf1185c29bc38ba7837867057572919

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "5fd3894cf872b4cda39a3b92b170bb6031955940721f3770d5d53dbaab1ee4fd",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
    "primary_cat": "astro-ph.SR",
    "submitted_at": "2026-05-13T11:30:55Z",
    "title_canon_sha256": "630bb95f0976c71ca6bd644c31d37b72bd1b94bf37b68bd26e4370d14652a60f"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13374",
    "kind": "arxiv",
    "version": 1
  }
}