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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.04389 |
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| _version_ | 1866914448015360000 |
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| author | McCudden, Paul Genet, Russell Major, John Hartman, Zachary Kovic, A. U. Wasson, Rick Ellis, Michael-James Jackson, Lou Brungardt, Bradley Weems, Zaida Wehlitz, Astrid Wille, Evan Bewersdorff, Leon Hardy, Nick Freed, Rachel Rowe, David Smith, Thomas C. Estrada, Reed Meneghini, Thomas Jones, Reggie Mason, Tom Collins, Dwight Copper, Mark |
| author_facet | McCudden, Paul Genet, Russell Major, John Hartman, Zachary Kovic, A. U. Wasson, Rick Ellis, Michael-James Jackson, Lou Brungardt, Bradley Weems, Zaida Wehlitz, Astrid Wille, Evan Bewersdorff, Leon Hardy, Nick Freed, Rachel Rowe, David Smith, Thomas C. Estrada, Reed Meneghini, Thomas Jones, Reggie Mason, Tom Collins, Dwight Copper, Mark |
| contents | Gaia two-parameter (G2P) stars have cumulative errors in parallax and proper motion so great that only their mean positions were reported in DR3. One potential cause of these high errors is another star as indicated by two intensity peaks in the scans. Speckle interferometry astrometric measurements of 25 G2P stars with high multi-peak percentages were obtained with the 1.5m telescope at Mt. Wilson Observatory. Of the 25 observed G2P stars, seven had no reported Gaia companions within 5.0". We found nearby companions for all seven. The 18 other G2P stars had known Gaia companions within 2.0". Of these, 13 had separations that agreed closely with the speckle measurements but with some discrepancy in position angles, three stars did not agree in either separation or position angle and no companion was detected for the remaining two. Although some of these issues may be resolved in DR4 or DR5, others may be inherent limitations of Gaia capabilities that speckle interferometry observations may be able to fill. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_04389 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Speckle Interferometry of 25 Gaia Two-Parameter Potential Binaries McCudden, Paul Genet, Russell Major, John Hartman, Zachary Kovic, A. U. Wasson, Rick Ellis, Michael-James Jackson, Lou Brungardt, Bradley Weems, Zaida Wehlitz, Astrid Wille, Evan Bewersdorff, Leon Hardy, Nick Freed, Rachel Rowe, David Smith, Thomas C. Estrada, Reed Meneghini, Thomas Jones, Reggie Mason, Tom Collins, Dwight Copper, Mark Solar and Stellar Astrophysics Astrophysics of Galaxies Gaia two-parameter (G2P) stars have cumulative errors in parallax and proper motion so great that only their mean positions were reported in DR3. One potential cause of these high errors is another star as indicated by two intensity peaks in the scans. Speckle interferometry astrometric measurements of 25 G2P stars with high multi-peak percentages were obtained with the 1.5m telescope at Mt. Wilson Observatory. Of the 25 observed G2P stars, seven had no reported Gaia companions within 5.0". We found nearby companions for all seven. The 18 other G2P stars had known Gaia companions within 2.0". Of these, 13 had separations that agreed closely with the speckle measurements but with some discrepancy in position angles, three stars did not agree in either separation or position angle and no companion was detected for the remaining two. Although some of these issues may be resolved in DR4 or DR5, others may be inherent limitations of Gaia capabilities that speckle interferometry observations may be able to fill. |
| title | Speckle Interferometry of 25 Gaia Two-Parameter Potential Binaries |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2604.04389 |