{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:ACYVHYWEJNYXPAK2RFDOXIBCVB","short_pith_number":"pith:ACYVHYWE","canonical_record":{"source":{"id":"1308.4417","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-20T20:01:16Z","cross_cats_sorted":[],"title_canon_sha256":"89c19c8a820bc8b2ce9b4fdd815bc9b1830ff638adf001b9121b437165ef8325","abstract_canon_sha256":"cc0c15dfb61292b02c72f057bb0f2c89a315ea6d24ac0bbfa87a6d972355e4a2"},"schema_version":"1.0"},"canonical_sha256":"00b153e2c44b7177815a8946eba022a855a426225747e472331f757ec93b2971","source":{"kind":"arxiv","id":"1308.4417","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.4417","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"arxiv_version","alias_value":"1308.4417v1","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.4417","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"pith_short_12","alias_value":"ACYVHYWEJNYX","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_16","alias_value":"ACYVHYWEJNYXPAK2","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_8","alias_value":"ACYVHYWE","created_at":"2026-05-18T12:27:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:ACYVHYWEJNYXPAK2RFDOXIBCVB","target":"record","payload":{"canonical_record":{"source":{"id":"1308.4417","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-20T20:01:16Z","cross_cats_sorted":[],"title_canon_sha256":"89c19c8a820bc8b2ce9b4fdd815bc9b1830ff638adf001b9121b437165ef8325","abstract_canon_sha256":"cc0c15dfb61292b02c72f057bb0f2c89a315ea6d24ac0bbfa87a6d972355e4a2"},"schema_version":"1.0"},"canonical_sha256":"00b153e2c44b7177815a8946eba022a855a426225747e472331f757ec93b2971","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:48:07.462762Z","signature_b64":"1Kry5MZTpG32JlB4P4bSvnJGuz9jsxdTJAYo40rQObBGAH76tndqiNMLZZ75fWocdcFqKeV4BJQ7+nPVTSHGCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"00b153e2c44b7177815a8946eba022a855a426225747e472331f757ec93b2971","last_reissued_at":"2026-05-18T01:48:07.462065Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:48:07.462065Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.4417","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:48:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3k4ZMxrKCdQ6BDz5XYRQgGqQ9gAM5NIUZSa12darvrPCjzOJE4SuTeG/BQcfPAWu+FYb05xXVjRi13IaFzPGAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T21:22:14.184879Z"},"content_sha256":"3d164272163fce54259920de9d85bdd79aca3bbf279bd844a1ddd24c618f8ddf","schema_version":"1.0","event_id":"sha256:3d164272163fce54259920de9d85bdd79aca3bbf279bd844a1ddd24c618f8ddf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:ACYVHYWEJNYXPAK2RFDOXIBCVB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HST/WFC3 Observations of Low-Mass Globular Clusters AM 4 and Palomar 13: Physical Properties and Implications for Mass Loss","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Abhijith Rajan, Andrew E. Dolphin, Carl J. Grillmair, Daniel R. Weisz, Graeme H. Smith, Katherine M. Hamren, Puragra Guhathakurta","submitted_at":"2013-08-20T20:01:16Z","abstract_excerpt":"We investigate the loss of low-mass stars in two of the faintest globular clusters known, AM 4 and Palomar 13 (Pal 13), using HST/WFC3 F606W and F814W photometry. To determine the physical properties of each cluster --- age, mass, metallicity, extinction, present day mass function (MF) --- we use the maximum likelihood color-magnitude diagram (CMD) fitting program MATCH and the Dartmouth, Padova and BaSTI stellar evolution models. For AM 4, the Dartmouth models provide the best match to the CMD and yield an age of >13 Gyr, metallicity log Z/Z_solar = -1.68 +/- 0.08, a distance modulus (m-M)_V "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.4417","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:48:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SjbYiRItJVvfjod6j7ZGlm7BRc/BfrakkANQmSGqnYo5Sx+fMe50Rv4Zu34oM6K2kUuw1r8UljhdIDdXg6W0Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T21:22:14.185528Z"},"content_sha256":"cd98cccf5a7268096996157ae185fb09ecce91cc747850af3a044aa7c904ecbc","schema_version":"1.0","event_id":"sha256:cd98cccf5a7268096996157ae185fb09ecce91cc747850af3a044aa7c904ecbc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB/bundle.json","state_url":"https://pith.science/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-27T21:22:14Z","links":{"resolver":"https://pith.science/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB","bundle":"https://pith.science/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB/bundle.json","state":"https://pith.science/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ACYVHYWEJNYXPAK2RFDOXIBCVB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:ACYVHYWEJNYXPAK2RFDOXIBCVB","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"cc0c15dfb61292b02c72f057bb0f2c89a315ea6d24ac0bbfa87a6d972355e4a2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-20T20:01:16Z","title_canon_sha256":"89c19c8a820bc8b2ce9b4fdd815bc9b1830ff638adf001b9121b437165ef8325"},"schema_version":"1.0","source":{"id":"1308.4417","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.4417","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"arxiv_version","alias_value":"1308.4417v1","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.4417","created_at":"2026-05-18T01:48:07Z"},{"alias_kind":"pith_short_12","alias_value":"ACYVHYWEJNYX","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_16","alias_value":"ACYVHYWEJNYXPAK2","created_at":"2026-05-18T12:27:38Z"},{"alias_kind":"pith_short_8","alias_value":"ACYVHYWE","created_at":"2026-05-18T12:27:38Z"}],"graph_snapshots":[{"event_id":"sha256:cd98cccf5a7268096996157ae185fb09ecce91cc747850af3a044aa7c904ecbc","target":"graph","created_at":"2026-05-18T01:48:07Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We investigate the loss of low-mass stars in two of the faintest globular clusters known, AM 4 and Palomar 13 (Pal 13), using HST/WFC3 F606W and F814W photometry. To determine the physical properties of each cluster --- age, mass, metallicity, extinction, present day mass function (MF) --- we use the maximum likelihood color-magnitude diagram (CMD) fitting program MATCH and the Dartmouth, Padova and BaSTI stellar evolution models. For AM 4, the Dartmouth models provide the best match to the CMD and yield an age of >13 Gyr, metallicity log Z/Z_solar = -1.68 +/- 0.08, a distance modulus (m-M)_V ","authors_text":"Abhijith Rajan, Andrew E. Dolphin, Carl J. Grillmair, Daniel R. Weisz, Graeme H. Smith, Katherine M. Hamren, Puragra Guhathakurta","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-20T20:01:16Z","title":"HST/WFC3 Observations of Low-Mass Globular Clusters AM 4 and Palomar 13: Physical Properties and Implications for Mass Loss"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.4417","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:3d164272163fce54259920de9d85bdd79aca3bbf279bd844a1ddd24c618f8ddf","target":"record","created_at":"2026-05-18T01:48:07Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"cc0c15dfb61292b02c72f057bb0f2c89a315ea6d24ac0bbfa87a6d972355e4a2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-08-20T20:01:16Z","title_canon_sha256":"89c19c8a820bc8b2ce9b4fdd815bc9b1830ff638adf001b9121b437165ef8325"},"schema_version":"1.0","source":{"id":"1308.4417","kind":"arxiv","version":1}},"canonical_sha256":"00b153e2c44b7177815a8946eba022a855a426225747e472331f757ec93b2971","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"00b153e2c44b7177815a8946eba022a855a426225747e472331f757ec93b2971","first_computed_at":"2026-05-18T01:48:07.462065Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:48:07.462065Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1Kry5MZTpG32JlB4P4bSvnJGuz9jsxdTJAYo40rQObBGAH76tndqiNMLZZ75fWocdcFqKeV4BJQ7+nPVTSHGCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:48:07.462762Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.4417","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3d164272163fce54259920de9d85bdd79aca3bbf279bd844a1ddd24c618f8ddf","sha256:cd98cccf5a7268096996157ae185fb09ecce91cc747850af3a044aa7c904ecbc"],"state_sha256":"277831a15b0b474321311164a764584597f258a312c0a1897936479c51b31fbe"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J62ohe2lFq+zXufoTK1vEt9PfkAIcDhcIOf+BV/0N0HFNadFCebJ7DG4TMMNxLc+2xQ3nu7w+7UZGmFgxv+eBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T21:22:14.188818Z","bundle_sha256":"cb8895c39f17f37d4bd00269d741425bb8c252b9ced82500ec4da26e829b5843"}}