source boundary
frontier-owneddeclared
A source record is provenance. It supports a finding only through evidence atoms, extraction spans, and reviewed finding bundles.
frontiers / frontier
Source record
back to sourcessource boundary
frontier-ownedA source record is provenance. It supports a finding only through evidence atoms, extraction spans, and reviewed finding bundles.
finding bindings
record contextFindings bound to this source through source ids, evidence atoms, provenance, or reviewed source-record slots.
evidence atoms
materializedEvidence atoms pin exact spans, measurements, selectors, or curation assertions to the source.
review context
inspectable1 reviewable changes and 0 evaluations are attached through this source or its findings.
Locator and citation
locator
title:M31 and M33 Pop II Cepheid surveys; WFPC2/ACS archives
imported
2026-05-29T02:16:30.157541+00:00
extraction mode
manual_curation
authors
reviewer:will-blair
Caveats
No source-specific caveats are recorded.
observational · vf_a54b3dda76b1da21
The Population II Cepheid-TRGB offset (Population II Cepheids have periods ≤ 20 days, intrinsic magnitude ~−2 to −3) provides a secondary rung; when calibrated against TRGB-anchored galaxies, Pop II Cepheid distances in M31 and M33 show ~5% agreement with TRGB but limited sample sizes restrict statistical power.
events
vev_66f8f960edc44a43finding.assertedManual finding added to frontier state
reviewer:will-blair · 2026-05-29
reviewable changes
vpr_3a4cc4c426b58be6finding.addManual finding added to frontier state
applied · reviewer:will-blair · 2026-05-29
evaluations
No evaluation rows are attached.