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@article{2421893,
author = {BauerandFasching, B. and Bernhard, K. and Brändli, E. and Burger, H. and Eisele, B. and Hümmerich, S. and Neuhold, J. and Paunzen, Ernst and Piecka, M. and Ratzenböck, S. and Prišegen, Michal},
article_number = {July 2024},
doi = {http://dx.doi.org/10.1051/0004-6361/202347476},
keywords = {stars: chemically peculiar; stars: rotation; stars: variables: general},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {New ACV variables discovered in the Zwicky Transient Facility survey},
url = {https://ui.adsabs.harvard.edu/abs/2024A%26A...687A.211B/abstract},
volume = {687},
year = {2024}
}
TY - JOUR
ID - 2421893
AU - Bauer-Fasching, B. - Bernhard, K. - Brändli, E. - Burger, H. - Eisele, B. - Hümmerich, S. - Neuhold, J. - Paunzen, Ernst - Piecka, M. - Ratzenböck, S. - Prišegen, Michal
PY - 2024
TI - New ACV variables discovered in the Zwicky Transient Facility survey
JF - Astronomy and Astrophysics
VL - 687
IS - July 2024
SP - 1-10
EP - 1-10
PB - EDP Sciences
SN - 00046361
KW - stars: chemically peculiar
KW - stars: rotation
KW - stars: variables: general
UR - https://ui.adsabs.harvard.edu/abs/2024A%26A...687A.211B/abstract
N2 - Context. The manifestation of surface spots on magnetic chemically peculiar (mCP) stars is most commonly explained by the atomic diffusion theory, which requires a calm stellar atmosphere and only moderate rotation. While very successful and well described, this theory still needs to be revised and fine-tuned to the observations. Aims. Our study aims to enlarge the sample of known photometrically variable mCP stars (ACV variables) to pave the way for more robust and significant statistical studies. We derive accurate physical parameters for these objects and discuss our results in the framework of the atomic diffusion theory. Methods. We studied 1314 candidate ACV variables that were selected from the Zwicky Transient Factory catalogue of periodic variables based on light curve characteristics. We investigated these objects using photometric criteria, a colour-magnitude diagram, and spectroscopic data from the LAMOST and Gaia missions to confirm their status as ACV variables. Results. We present a sample of 1232 new ACV variables, including information on distance from the Sun, mass, fractional age on the main sequence, fraction of the radius between the zero-age and terminal-age main sequence, and the equatorial velocity and its ratio to the critical velocity. Conclusions. Our results confirm that the employed selection process is highly efficient for detecting ACV variables. We have identified 38 stars with vequ in excess of 150 km s(-1) (with extreme values up to 260 km s(-1)). This challenges current theories that cannot explain the occurrence of such fast-rotating mCP stars.
ER -
BAUER-FASCHING, B., K. BERNHARD, E. BRÄNDLI, H. BURGER, B. EISELE, S. HÜMMERICH, J. NEUHOLD, Ernst PAUNZEN, M. PIECKA, S. RATZENBÖCK and Michal PRIŠEGEN. New ACV variables discovered in the Zwicky Transient Facility survey. \textit{Astronomy and Astrophysics}. EDP Sciences, 2024, vol.~687, July 2024, p.~1-10. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/202347476.
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