New ACV variables discovered in the Zwicky Transient Facility survey
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F24%3A00136714" target="_blank" >RIV/00216224:14310/24:00136714 - isvavai.cz</a>
Result on the web
<a href="https://www.aanda.org/articles/aa/full_html/2024/07/aa47476-23/aa47476-23.html" target="_blank" >https://www.aanda.org/articles/aa/full_html/2024/07/aa47476-23/aa47476-23.html</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202347476" target="_blank" >10.1051/0004-6361/202347476</a>
Alternative languages
Result language
angličtina
Original language name
New ACV variables discovered in the Zwicky Transient Facility survey
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy and Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
687
Issue of the periodical within the volume
July 2024
Country of publishing house
FR - FRANCE
Number of pages
10
Pages from-to
1-10
UT code for WoS article
001270377500006
EID of the result in the Scopus database
2-s2.0-85198824283