RR Lyrae Stars Belonging to the Candidate Globular Cluster Patchick 99
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| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911764783824896 |
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| author | Butler, Evan Kunder, Andrea Prudil, Zdenek Covey, Kevin R. Ball, Macy Campos, Carlos Gollnick, Kaylen Carvajal, Julio Olivares Hughes, Joanne Devine, Kathryn Johnson, Christian I. Vivas, A. Katherina Rich, Michael R. Joyce, Meridith Simon, Iulia T. Marchetti, Tommaso Koch-Hansen, Andreas J. Clarkson, William I. Kuss, Rebekah |
| author_facet | Butler, Evan Kunder, Andrea Prudil, Zdenek Covey, Kevin R. Ball, Macy Campos, Carlos Gollnick, Kaylen Carvajal, Julio Olivares Hughes, Joanne Devine, Kathryn Johnson, Christian I. Vivas, A. Katherina Rich, Michael R. Joyce, Meridith Simon, Iulia T. Marchetti, Tommaso Koch-Hansen, Andreas J. Clarkson, William I. Kuss, Rebekah |
| contents | Patchick 99 is a candidate globular cluster located in the direction of the Galactic bulge, with a proper motion almost identical to the field and extreme field star contamination. A recent analysis suggests it is a low-luminosity globular cluster with a population of RR Lyrae stars. We present new spectra of stars in and around Patchick 99, targeting specifically the 3 RR Lyrae stars associated with the cluster as well as the other RR Lyrae stars in the field. A sample of 53 giant stars selected from proper motions and a position on CMD are also observed. The three RR Lyrae stars associated with the cluster have similar radial velocities and distances, and two of the targeted giants also have radial velocities in this velocity regime and [Fe/H] metallicities that are slightly more metal-poor than the field. Therefore, if Patchick 99 is a bonafide globular cluster, it would have a radial velocity of -92+/-10 km s-1, a distance of 6.7+/-0.4 kpc (as determined from the RR Lyrae stars), and an orbit that confines it to the inner bulge. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_13825 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | RR Lyrae Stars Belonging to the Candidate Globular Cluster Patchick 99 Butler, Evan Kunder, Andrea Prudil, Zdenek Covey, Kevin R. Ball, Macy Campos, Carlos Gollnick, Kaylen Carvajal, Julio Olivares Hughes, Joanne Devine, Kathryn Johnson, Christian I. Vivas, A. Katherina Rich, Michael R. Joyce, Meridith Simon, Iulia T. Marchetti, Tommaso Koch-Hansen, Andreas J. Clarkson, William I. Kuss, Rebekah Solar and Stellar Astrophysics Astrophysics of Galaxies Patchick 99 is a candidate globular cluster located in the direction of the Galactic bulge, with a proper motion almost identical to the field and extreme field star contamination. A recent analysis suggests it is a low-luminosity globular cluster with a population of RR Lyrae stars. We present new spectra of stars in and around Patchick 99, targeting specifically the 3 RR Lyrae stars associated with the cluster as well as the other RR Lyrae stars in the field. A sample of 53 giant stars selected from proper motions and a position on CMD are also observed. The three RR Lyrae stars associated with the cluster have similar radial velocities and distances, and two of the targeted giants also have radial velocities in this velocity regime and [Fe/H] metallicities that are slightly more metal-poor than the field. Therefore, if Patchick 99 is a bonafide globular cluster, it would have a radial velocity of -92+/-10 km s-1, a distance of 6.7+/-0.4 kpc (as determined from the RR Lyrae stars), and an orbit that confines it to the inner bulge. |
| title | RR Lyrae Stars Belonging to the Candidate Globular Cluster Patchick 99 |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2401.13825 |