The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids
Pre-Gaia distances for the open cluster Pismis 19 disagree with Gaia parallaxes. A Two Micron All Sky Survey (2MASS) JK _s red clump distance was therefore established for Pismis 19 (2.90 ± 0.15 kpc), which reaffirms that zero-point corrections for Gaia are required. OGLE GD-CEP-1864 is confirmed as...
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2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adb9e4 |
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| author | Daniel Majaess Charles J. Bonatto David G. Turner Roberto K. Saito Dante Minniti Christian Moni Bidin Danilo González-Díaz Javier Alonso-Garcia Giuseppe Bono Vittorio F. Braga Maria G. Navarro Giovanni Carraro Matias Gomez |
| author_facet | Daniel Majaess Charles J. Bonatto David G. Turner Roberto K. Saito Dante Minniti Christian Moni Bidin Danilo González-Díaz Javier Alonso-Garcia Giuseppe Bono Vittorio F. Braga Maria G. Navarro Giovanni Carraro Matias Gomez |
| author_sort | Daniel Majaess |
| collection | DOAJ |
| description | Pre-Gaia distances for the open cluster Pismis 19 disagree with Gaia parallaxes. A Two Micron All Sky Survey (2MASS) JK _s red clump distance was therefore established for Pismis 19 (2.90 ± 0.15 kpc), which reaffirms that zero-point corrections for Gaia are required. OGLE GD-CEP-1864 is confirmed as a member of Pismis 19 on the basis of DR3 proper motions and its 2MASS+Vista Variables in the Vía Láctea color–magnitude position near the tip of the turnoff. That 0.3 day 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 (≃0.5 day). 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 | Article |
| id | doaj-art-45cd8c91b95e4a0699129cee9a61c60c |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-45cd8c91b95e4a0699129cee9a61c60c2025-08-20T03:43:54ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01982216510.3847/1538-4357/adb9e4The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from CepheidsDaniel Majaess0https://orcid.org/0000-0001-8803-3840Charles J. Bonatto1https://orcid.org/0000-0002-4102-1751David G. Turner2https://orcid.org/0000-0003-1184-1860Roberto K. Saito3https://orcid.org/0000-0001-6878-8648Dante Minniti4https://orcid.org/0000-0002-7064-099XChristian Moni Bidin5https://orcid.org/0009-0004-3783-6378Danilo González-Díaz6https://orcid.org/0000-0003-1698-4924Javier Alonso-Garcia7https://orcid.org/0000-0003-3496-3772Giuseppe Bono8https://orcid.org/0000-0002-4896-8841Vittorio F. Braga9https://orcid.org/0000-0001-7511-2830Maria G. Navarro10https://orcid.org/0000-0002-1860-2304Giovanni Carraro11https://orcid.org/0000-0002-0155-9434Matias Gomez12https://orcid.org/0000-0002-4430-9427Mount Saint Vincent University , Halifax, Canada ; Daniel.Majaess@msvu.caDepartamento de Astronomia, Universidade Federal do Rio Grande do Sul , CP 15051, RS, Porto Alegre 91501-970, BrazilSaint Mary’s University , Halifax, CanadaDepartamento de Física, Universidade Federal de Santa Catarina , Trindade 88040-900, Florianópolis, BrazilInstituto de Astrofísica, Dep. de Física y Astronomía, Facultad de Ciencias Exactas, Universidad Andres Bello , Av. Fernández Concha 700, Santiago, Chile; Vatican Observatory , Specola Vaticana, V-00120, Vatican City State, Vatican CityInstituto de Astronomía, Universidad Católica del Norte , Av. Angamos 0610, Antofagasta, ChileInstituto de Astronomía, Universidad Católica del Norte , Av. Angamos 0610, Antofagasta, Chile; Universidad de Antioquia , Calle 70 52-21, Medellín, ColombiaCentro de Astronomía, Universidad de Antofagasta , Av. Angamos 601, Antofagasta, Chile; Millennium Institute of Astrophysics , Nuncio Monseñor Sotero Sanz 100, Of. 104, Providencia, Santiago, ChileDepartment of Physics, Universitá di Roma Tor Vergata , via della Ricerca Scientifica 1, 00133, Rome, Italy; INAF—Osservatorio Astronomico di Roma , Via di Frascati 33, 00078 Monte Porzio Catone, ItalyINAF—Osservatorio Astronomico di Roma , Via di Frascati 33, 00078 Monte Porzio Catone, ItalyINAF—Osservatorio Astronomico di Roma , Via di Frascati 33, 00078 Monte Porzio Catone, ItalyDipartimento di Fisica e Astronomia “Galileo Galilei,” Universitá degli Studi di Padova , Vicolo Osservatorio 3, I-35122, Padova, ItalyInstituto de Astrofísica, Dep. de Física y Astronomía, Facultad de Ciencias Exactas, Universidad Andres Bello , Av. Fernández Concha 700, Santiago, ChilePre-Gaia distances for the open cluster Pismis 19 disagree with Gaia parallaxes. A Two Micron All Sky Survey (2MASS) JK _s red clump distance was therefore established for Pismis 19 (2.90 ± 0.15 kpc), which reaffirms that zero-point corrections for Gaia are required. OGLE GD-CEP-1864 is confirmed as a member of Pismis 19 on the basis of DR3 proper motions and its 2MASS+Vista Variables in the Vía Láctea color–magnitude position near the tip of the turnoff. That 0.3 day 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 (≃0.5 day). 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.https://doi.org/10.3847/1538-4357/adb9e4Variable starsStar clusters |
| spellingShingle | Daniel Majaess Charles J. Bonatto David G. Turner Roberto K. Saito Dante Minniti Christian Moni Bidin Danilo González-Díaz Javier Alonso-Garcia Giuseppe Bono Vittorio F. Braga Maria G. Navarro Giovanni Carraro Matias Gomez The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids The Astrophysical Journal Variable stars Star clusters |
| title | The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids |
| title_full | The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids |
| title_fullStr | The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids |
| title_full_unstemmed | The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids |
| title_short | The Gaia Parallax Discrepancy for the Cluster Pismis 19 and Separating δ Scutis from Cepheids |
| title_sort | gaia parallax discrepancy for the cluster pismis 19 and separating δ scutis from cepheids |
| topic | Variable stars Star clusters |
| url | https://doi.org/10.3847/1538-4357/adb9e4 |
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