The Chemical Homogeneity of Single-Lined Spectroscopic Binaries in Open Clusters
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2026
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866908845999128576 |
|---|---|
| author | Sinha, Amaya Zasowski, Gail Myers, Natalie R. Manea, Catherine Frinchaboy, Peter Cunha, Katia Müller-Horn, Johanna Mao, Yao-Yuan Behmard, Aida Carlberg, Joleen Chanamé, Julio Frazer, Polly Griffith, Emily Loebman, Sarah Roman-Lopes, A. Otto, Jonah Souto, Diogo Staussan, Keivan Stringfellow, Guy S. |
| author_facet | Sinha, Amaya Zasowski, Gail Myers, Natalie R. Manea, Catherine Frinchaboy, Peter Cunha, Katia Müller-Horn, Johanna Mao, Yao-Yuan Behmard, Aida Carlberg, Joleen Chanamé, Julio Frazer, Polly Griffith, Emily Loebman, Sarah Roman-Lopes, A. Otto, Jonah Souto, Diogo Staussan, Keivan Stringfellow, Guy S. |
| contents | Using SDSS-V DR19 Milky Way Mapper APOGEE data, we measure the impact that close binarity has on surface chemistry across the Hertzsprung-Russell diagram in a broad set of abundances by studying single-lined spectroscopic binaries (SB1s) in open clusters. We derive binary membership and orbital parameters for 103 SB1s by analysing APOGEE radial velocities with The Joker and UltraNest. We perform a detailed abundance analysis with BACCHUS to derive abundances in fourteen chemical species: Si, Fe, C, N, O, Na, Mg, Al, Ca, Ti, Cr, Ni, Ce, and Nd. Leveraging the assumptions of chemical homogeneity in open clusters, we compare the surface abundances of SB1s to non-binary stars at similar evolutionary states. We find that a subset of binaries with significant UV excess have a $Δ$[C/N] that is 0.2--0.5 dex higher than expected, resulting in overestimated [C/N]-based ages for those stars. This points to pollution from an evolved companion and has implications for [C/N]-based age studies of the broader Milky Way. At the population level, we find that SB1s in our sample can be treated as statistically chemically homogeneous with their single-star counterparts, and we find no connection between orbital separation and chemical enrichment or depletion. We show that at separations up to ~5 pc, co-eval stars can be considered chemically homogeneous with one another within current abundance precisions, regardless of multiplicity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_18552 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Chemical Homogeneity of Single-Lined Spectroscopic Binaries in Open Clusters Sinha, Amaya Zasowski, Gail Myers, Natalie R. Manea, Catherine Frinchaboy, Peter Cunha, Katia Müller-Horn, Johanna Mao, Yao-Yuan Behmard, Aida Carlberg, Joleen Chanamé, Julio Frazer, Polly Griffith, Emily Loebman, Sarah Roman-Lopes, A. Otto, Jonah Souto, Diogo Staussan, Keivan Stringfellow, Guy S. Astrophysics of Galaxies Solar and Stellar Astrophysics Using SDSS-V DR19 Milky Way Mapper APOGEE data, we measure the impact that close binarity has on surface chemistry across the Hertzsprung-Russell diagram in a broad set of abundances by studying single-lined spectroscopic binaries (SB1s) in open clusters. We derive binary membership and orbital parameters for 103 SB1s by analysing APOGEE radial velocities with The Joker and UltraNest. We perform a detailed abundance analysis with BACCHUS to derive abundances in fourteen chemical species: Si, Fe, C, N, O, Na, Mg, Al, Ca, Ti, Cr, Ni, Ce, and Nd. Leveraging the assumptions of chemical homogeneity in open clusters, we compare the surface abundances of SB1s to non-binary stars at similar evolutionary states. We find that a subset of binaries with significant UV excess have a $Δ$[C/N] that is 0.2--0.5 dex higher than expected, resulting in overestimated [C/N]-based ages for those stars. This points to pollution from an evolved companion and has implications for [C/N]-based age studies of the broader Milky Way. At the population level, we find that SB1s in our sample can be treated as statistically chemically homogeneous with their single-star counterparts, and we find no connection between orbital separation and chemical enrichment or depletion. We show that at separations up to ~5 pc, co-eval stars can be considered chemically homogeneous with one another within current abundance precisions, regardless of multiplicity. |
| title | The Chemical Homogeneity of Single-Lined Spectroscopic Binaries in Open Clusters |
| topic | Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2602.18552 |