J/A+A/687/A211 New ACV variables in the ZTF (Bauer-Fasching+, 2024)
New ACV variables discovered in the Zwicky Transient Facility survey.
Bauer-Fasching B., Bernhard K., Brandli E., Burger H., Eisele B.,
Hummerich S., Neuhold J., Paunzen E., Piecka M., Ratzenbock S., Prisegen M.
<Astron. Astrophys. 687, A211 (2024)>
=2024A&A...687A.211B 2024A&A...687A.211B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Ap ; Stars, peculiar ; Stars, variable ; Spectral types ;
MK spectral classification ; Photometry ; Optical
Keywords: stars: chemically peculiar - stars: rotation -
stars: variables: general
Abstract:
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. 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.
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. Our results confirm that the employed selection process is
highly efficient for detecting ACV variables. We have identified 38
stars with v(equ) in excess of 150km/s (with extreme values up to
260km/s). This challenges current theories that cannot explain the
occurrence of such fast-rotating mCP stars.
Description:
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 213 1232 The data for the 1232 new ACV variables
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/A+A/656/A125 : ACV variables in the ZTF (Faltova+, 2021)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- ZTF ZTF identifier (JHHMMSS.ss+DDMMSS.s)
21- 39 I19 --- GaiaEDR3 Gaia EDR3 identifier
41- 52 F12.7 deg RAdeg Right ascension (J2000)
54- 65 F12.7 deg DEdeg Declination (J2000)
67- 76 F10.6 d Per Final period
78- 85 F8.4 mag Gmag Gaia G magnitude from the Gaia DR2
87- 94 F8.4 mag e_Gmag Gaia G magnitude error from the Gaia DR2
96-103 F8.4 mag BP-RP Gaia BP-RP color from the Gaia DR2
105-112 F8.4 mag e_BP-RP Gaia BP-RP color error from the Gaia DR2
114-121 F8.3 mag g1-y ?=-99 g1-y color
123-130 F8.3 mag amag ?=-99 alpha index
132-139 F8.3 mag E(B-V) Reddening E(B-V)
141-149 F9.4 mas plx Parallax from the Gaia DR2
151-159 F9.4 mas e_plx Parallax error from the Gaia DR2
161-166 F6.2 Msun Mass ?=-99 Mass
168-173 F6.2 % taut ?=-99 Fractional age on the main sequence
175-180 F6.2 % taur ?=-99 Fractional radius on the main sequence
182-187 F6.2 km/s veq ?=-99 Equatorial velocity
189-194 F6.2 % veqvcrit ?=-99 Ratio of the equatorial and breakup
velocity
196-213 A18 --- SpType Spectral type as derived in this study
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Acknowledgements:
Ernst Paunzen, epaunzen(at)physics.muni.cz
(End) E. Paunzen [Masaryk Univ., Czech Rep.], P. Vannier [CDS] 02-Jul-2024