The Gaia parallax discrepancy for the cluster Pismis 19, and separating $δ$ Scutis from Cepheids
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915145377120256 |
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| author | Majaess, Daniel Bonatto, Charles J. Turner, David G. Saito, Roberto K. Minniti, Dante Bidin, Christian Moni González-Díaz, Danilo Alonso-Garcia, Javier Bono, Giuseppe Braga, Vittorio F. Navarro, Maria G. Carraro, Giovanni Gomez, Matias |
| author_facet | Majaess, Daniel Bonatto, Charles J. Turner, David G. Saito, Roberto K. Minniti, Dante Bidin, Christian Moni González-Díaz, Danilo Alonso-Garcia, Javier Bono, Giuseppe Braga, Vittorio F. Navarro, Maria G. Carraro, Giovanni Gomez, Matias |
| contents | Pre-Gaia distances for the open cluster Pismis 19 disagree with Gaia parallaxes. A 2MASS $JK_s$ red clump distance was therefore established for Pismis 19 ($2.90\pm0.15$ kpc), which reaffirms that zero-point corrections for Gaia are required (e.g., Lindegren et al.~2021). OGLE GD-CEP-1864 is confirmed as a member of Pismis 19 on the basis of DR3 proper motions, and its 2MASS+VVV color-magnitude position near the tip of the turnoff. That $0^{\rm d}.3$ variable star is likely a $δ$ Scuti rather than a classical Cepheid. The case revealed a pertinent criterion to segregate those two populations in tandem with the break in the Wesenheit Leavitt Law ($\simeq 0^{\rm d}.5$). Just shortward of that period discontinuity are $δ$ Scutis, whereas beyond the break lie first overtone classical Cepheids mostly observed beyond the first crossing of the instability strip. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_06930 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Gaia parallax discrepancy for the cluster Pismis 19, and separating $δ$ Scutis from Cepheids Majaess, Daniel Bonatto, Charles J. Turner, David G. Saito, Roberto K. Minniti, Dante Bidin, Christian Moni González-Díaz, Danilo Alonso-Garcia, Javier Bono, Giuseppe Braga, Vittorio F. Navarro, Maria G. Carraro, Giovanni Gomez, Matias Solar and Stellar Astrophysics Astrophysics of Galaxies Pre-Gaia distances for the open cluster Pismis 19 disagree with Gaia parallaxes. A 2MASS $JK_s$ red clump distance was therefore established for Pismis 19 ($2.90\pm0.15$ kpc), which reaffirms that zero-point corrections for Gaia are required (e.g., Lindegren et al.~2021). OGLE GD-CEP-1864 is confirmed as a member of Pismis 19 on the basis of DR3 proper motions, and its 2MASS+VVV color-magnitude position near the tip of the turnoff. That $0^{\rm d}.3$ variable star is likely a $δ$ Scuti rather than a classical Cepheid. The case revealed a pertinent criterion to segregate those two populations in tandem with the break in the Wesenheit Leavitt Law ($\simeq 0^{\rm d}.5$). Just shortward of that period discontinuity are $δ$ Scutis, whereas beyond the break lie first overtone classical Cepheids mostly observed beyond the first crossing of the instability strip. |
| title | The Gaia parallax discrepancy for the cluster Pismis 19, and separating $δ$ Scutis from Cepheids |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.06930 |