Quantifying the scale of star formation across the Perseus spiral arm using young clusters around Cas OB5.

Λεπτομέρειες βιβλιογραφικής εγγραφής
Τίτλος:	Quantifying the scale of star formation across the Perseus spiral arm using young clusters around Cas OB5.
Συγγραφείς:	Quintana, Alexis L., Negueruela, Ignacio, Berlanas, Sara R.
Πηγή:	Astronomy & Astrophysics / Astronomie et Astrophysique; 2025, Vol. 697, p1-16, 16p
Θεματικοί όροι:	Star formation, Open clusters of stars, Clustering algorithms, Spectrum analysis, Star clusters
Περίληψη:	Context. Cas OB5 is an OB association located at a distance of 2.5–3 kpc that intercepts the Perseus spiral arm. It carries a moderate amount of reddening (AV ~ 2–3 mag) and contains several well-known open clusters within its boundaries, such as King 12, NGC 7788, and NGC 7790. The availability of modern clustering algorithms, together with Gaia DR3 kinematics and complementary spectroscopic data, makes it a suitable site for studies of Galactic structure. Aims. We seek to quantify the spatial scale of star formation in the spiral arms, using Cas OB5 as a pilot target before extending our study to more distant and extinguished regions of the Galaxy. Methods. We selected 129 695 candidate OBA stars in a 6x8 deg² region around Cas OB5. We applied a spectral energy distribution (SED) fitting process to this sample to derive the physical parameters. Through this process, we found 56 379 OBA stars, which we then clustered using HDBSCAN. Results. We identified 17 open clusters inside this area, four of which appear to form a coherent structure that we identify as Cas OB5. Nevertheless, our findings suggest that these clusters belong to two different age groups despite sharing a similar position and kinematics. Spectroscopic observations confirm the youth of NGC 7788 (10–15 Myr) compared to NGC 7790 (110 ± 15 Myr). Conclusions. We have determined a spatial scale for star formation of a few tens of pc to a few hundreds of pc, comparing the clustered to the diffuse population of Cas OB5 across this part of the Perseus arm. A spectroscopic analysis was required to complement the clustering algorithm, so that we could separate younger OCs (tracers of the spiral arm) from older ones. These results highlight the need to combine these techniques to fully disentangle the Milky Way structure. [ABSTRACT FROM AUTHOR]
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Βάση Δεδομένων:	Complementary Index

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Header	DbId: edb DbLabel: Complementary Index An: 189449586 RelevancyScore: 994 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 993.548583984375
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Items	– Name: Title Label: Title Group: Ti Data: Quantifying the scale of star formation across the Perseus spiral arm using young clusters around Cas OB5. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Quintana%2C+Alexis+L%2E%22">Quintana, Alexis L.</searchLink><br /><searchLink fieldCode="AR" term="%22Negueruela%2C+Ignacio%22">Negueruela, Ignacio</searchLink><br /><searchLink fieldCode="AR" term="%22Berlanas%2C+Sara+R%2E%22">Berlanas, Sara R.</searchLink> – Name: TitleSource Label: Source Group: Src Data: Astronomy & Astrophysics / Astronomie et Astrophysique; 2025, Vol. 697, p1-16, 16p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Star+formation%22">Star formation</searchLink><br /><searchLink fieldCode="DE" term="%22Open+clusters+of+stars%22">Open clusters of stars</searchLink><br /><searchLink fieldCode="DE" term="%22Clustering+algorithms%22">Clustering algorithms</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Star+clusters%22">Star clusters</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Context. Cas OB5 is an OB association located at a distance of 2.5–3 kpc that intercepts the Perseus spiral arm. It carries a moderate amount of reddening (A<subscript>V</subscript> ~ 2–3 mag) and contains several well-known open clusters within its boundaries, such as King 12, NGC 7788, and NGC 7790. The availability of modern clustering algorithms, together with Gaia DR3 kinematics and complementary spectroscopic data, makes it a suitable site for studies of Galactic structure. Aims. We seek to quantify the spatial scale of star formation in the spiral arms, using Cas OB5 as a pilot target before extending our study to more distant and extinguished regions of the Galaxy. Methods. We selected 129 695 candidate OBA stars in a 6x8 deg<superscript>2</superscript> region around Cas OB5. We applied a spectral energy distribution (SED) fitting process to this sample to derive the physical parameters. Through this process, we found 56 379 OBA stars, which we then clustered using HDBSCAN. Results. We identified 17 open clusters inside this area, four of which appear to form a coherent structure that we identify as Cas OB5. Nevertheless, our findings suggest that these clusters belong to two different age groups despite sharing a similar position and kinematics. Spectroscopic observations confirm the youth of NGC 7788 (10–15 Myr) compared to NGC 7790 (110 ± 15 Myr). Conclusions. We have determined a spatial scale for star formation of a few tens of pc to a few hundreds of pc, comparing the clustered to the diffuse population of Cas OB5 across this part of the Perseus arm. A spectroscopic analysis was required to complement the clustering algorithm, so that we could separate younger OCs (tracers of the spiral arm) from older ones. These results highlight the need to combine these techniques to fully disentangle the Milky Way structure. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of Astronomy & Astrophysics / Astronomie et Astrophysique is the property of EDP Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo	BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/0004-6361/202452615 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 1 Subjects: – SubjectFull: Star formation Type: general – SubjectFull: Open clusters of stars Type: general – SubjectFull: Clustering algorithms Type: general – SubjectFull: Spectrum analysis Type: general – SubjectFull: Star clusters Type: general Titles: – TitleFull: Quantifying the scale of star formation across the Perseus spiral arm using young clusters around Cas OB5. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Quintana, Alexis L. – PersonEntity: Name: NameFull: Negueruela, Ignacio – PersonEntity: Name: NameFull: Berlanas, Sara R. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: 2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00046361 Numbering: – Type: volume Value: 697 Titles: – TitleFull: Astronomy & Astrophysics / Astronomie et Astrophysique Type: main
ResultId	1