Interferometric Images of the Starspot Evolution of $ζ$ Andromedae
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866915873630978048 |
|---|---|
| author | Roettenbacher, Rachael M. Monnier, John D. Korhonen, Heidi Henry, Gregory W. Kotnik, Cliff Pepper, Joshua Seli, Bálint Vida, Krisztián Bódi, Attila Cseh, Borbála Csörnyei, Géza Krezinger, Máté Könyves-Tóth, Réka Kriskovics, Levente Sárneczky, Krisztián Sódor, Ádám Szakáts, Róbert Kraus, Stefan Anugu, Narsireddy Davies, Claire L. Gardner, Tyler Lanthermann, Cyprien Schaefer, Gail H. Setterholm, Benjamin R. |
| author_facet | Roettenbacher, Rachael M. Monnier, John D. Korhonen, Heidi Henry, Gregory W. Kotnik, Cliff Pepper, Joshua Seli, Bálint Vida, Krisztián Bódi, Attila Cseh, Borbála Csörnyei, Géza Krezinger, Máté Könyves-Tóth, Réka Kriskovics, Levente Sárneczky, Krisztián Sódor, Ádám Szakáts, Róbert Kraus, Stefan Anugu, Narsireddy Davies, Claire L. Gardner, Tyler Lanthermann, Cyprien Schaefer, Gail H. Setterholm, Benjamin R. |
| contents | The evolution of starspots of the giant primaries of RS CVn systems is typically detected indirectly with photometric and spectroscopic monitoring. These observations suggest slowly-evolving stellar surfaces and can constrain differential rotation as starspots move with respect to one another. However, starspot latitudes are difficult to constrain without resolved images of the stellar surfaces from which the unambiguous locations of starspots are determined. We imaged the active RS CVn primary $ζ$ And with the 330-m-baseline Center for High Angular Resolution Astronomy Array for three epochs over approximately six rotations of the star. The resultant images show a more complicated picture of stellar activity than expected from the contemporaneous photometry and earlier Doppler images. The spot structures change on the timescale of rotation, making differential rotation difficult to study. Our observations show changes in the polar spot, growing over time. We do not detect the secondary star in the interferometric data, though the observations are sensitive to the predicted 0.75 $M_\odot$ main-sequence star, and we suggest the companion may be a white dwarf. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_18144 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Interferometric Images of the Starspot Evolution of $ζ$ Andromedae Roettenbacher, Rachael M. Monnier, John D. Korhonen, Heidi Henry, Gregory W. Kotnik, Cliff Pepper, Joshua Seli, Bálint Vida, Krisztián Bódi, Attila Cseh, Borbála Csörnyei, Géza Krezinger, Máté Könyves-Tóth, Réka Kriskovics, Levente Sárneczky, Krisztián Sódor, Ádám Szakáts, Róbert Kraus, Stefan Anugu, Narsireddy Davies, Claire L. Gardner, Tyler Lanthermann, Cyprien Schaefer, Gail H. Setterholm, Benjamin R. Solar and Stellar Astrophysics The evolution of starspots of the giant primaries of RS CVn systems is typically detected indirectly with photometric and spectroscopic monitoring. These observations suggest slowly-evolving stellar surfaces and can constrain differential rotation as starspots move with respect to one another. However, starspot latitudes are difficult to constrain without resolved images of the stellar surfaces from which the unambiguous locations of starspots are determined. We imaged the active RS CVn primary $ζ$ And with the 330-m-baseline Center for High Angular Resolution Astronomy Array for three epochs over approximately six rotations of the star. The resultant images show a more complicated picture of stellar activity than expected from the contemporaneous photometry and earlier Doppler images. The spot structures change on the timescale of rotation, making differential rotation difficult to study. Our observations show changes in the polar spot, growing over time. We do not detect the secondary star in the interferometric data, though the observations are sensitive to the predicted 0.75 $M_\odot$ main-sequence star, and we suggest the companion may be a white dwarf. |
| title | Interferometric Images of the Starspot Evolution of $ζ$ Andromedae |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2603.18144 |