A new sample of super-slowly rotating Ap (ssrAp) stars from the
Zwicky Transient Facility survey

J 2024

A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey

HUEMMERICH, Stefan; Klaus BERNHARD and Ernst PAUNZEN

Basic information

Original name

A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey

Authors

HUEMMERICH, Stefan; Klaus BERNHARD and Ernst PAUNZEN (40 Austria, belonging to the institution)

Edition

Astronomy and Astrophysics, EDP Sciences, 2024, 0004-6361

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

is not subject to a state or trade secret

References:

URL

Impact factor

Impact factor: 5.400 in 2023

RIV identification code

RIV/00216224:14310/24:00138986

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1051/0004-6361/202452075

UT WoS

001379748900002

EID Scopus

2-s2.0-85212975430

Keywords in English

stars: chemically peculiar; stars: early-type; stars: rotation; stars: variables: general

Abstract

V originále

Context: The magnetic chemically peculiar Ap stars exhibit an extreme spread of rotational velocities, the cause of which is not clearly understood. Ap stars with rotation periods of 50 days or longer are know as super-slowly rotating Ap (ssrAp) stars. Photometrically variable Ap stars are commonly termed alpha(2) Canum Venaticorum (ACV) variables. Aims: Our study aims to enlarge the sample of known ssrAp stars using data from the Zwicky Transient Facility (ZTF) survey to enable more robust and significant statistical studies of these objects. Methods: Using selection criteria based on the known characteristics of ACV variables, candidate stars were gleaned from the ZTF catalogues of periodic and suspected variable stars and from ZTF raw data. ssrAp stars were identified from this list via their characteristic photometric properties, Delta a photometry, and spectral classification. Results: The final sample consists of 70 new ssrAp stars, which mostly exhibit rotation periods of between 50 and 200 days. The object with the longest period has a rotation period of 2551.7 days. We present astrophysical parameters and a Hertzsprung-Russell diagram for the complete sample of known ssrAp stars. With very few exceptions, the ssrAp stars are grouped in the middle of the main sequence with ages in excess of 150 Myr. ZTF J021309.72+582827.7 was identified as a possible binary star harbouring an Ap star and a cool component, possibly shrouded in dust. Conclusions: With our study, we enlarge the sample of known ssrAp stars by about 150%, paving the way for more in-depth statistical studies.

Cite

HUEMMERICH, Stefan; Klaus BERNHARD and Ernst PAUNZEN. A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey. Astronomy and Astrophysics. EDP Sciences, 2024, vol. 692, December, p. 1-10. ISSN 0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/202452075.

@article{2481648,
   author = {Huemmerich, Stefan and Bernhard, Klaus and Paunzen, Ernst},
   article_number = {December},
   doi = {http://dx.doi.org/10.1051/0004-6361/202452075},
   keywords = {stars: chemically peculiar; stars: early-type; stars: rotation; stars: variables: general},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy and Astrophysics},
   title = {A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey},
   url = {https://doi.org/10.1051/0004-6361/202452075},
   volume = {692},
   year = {2024}
}

TY  - JOUR
ID  - 2481648
AU  - Huemmerich, Stefan - Bernhard, Klaus - Paunzen, Ernst
PY  - 2024
TI  - A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey
JF  - Astronomy and Astrophysics
VL  - 692
IS  - December
SP  - 1-10
EP  - 1-10
PB  - EDP Sciences
SN  - 00046361
KW  - stars: chemically peculiar
KW  - stars: early-type
KW  - stars: rotation
KW  - stars: variables: general
UR  - https://doi.org/10.1051/0004-6361/202452075
N2  - Context: The magnetic chemically peculiar Ap stars exhibit an extreme spread of rotational velocities, the cause of which is not clearly understood. Ap stars with rotation periods of 50 days or longer are know as super-slowly rotating Ap (ssrAp) stars. Photometrically variable Ap stars are commonly termed alpha(2) Canum Venaticorum (ACV) variables. Aims: Our study aims to enlarge the sample of known ssrAp stars using data from the Zwicky Transient Facility (ZTF) survey to enable more robust and significant statistical studies of these objects. Methods: Using selection criteria based on the known characteristics of ACV variables, candidate stars were gleaned from the ZTF catalogues of periodic and suspected variable stars and from ZTF raw data. ssrAp stars were identified from this list via their characteristic photometric properties, Delta a photometry, and spectral classification. Results: The final sample consists of 70 new ssrAp stars, which mostly exhibit rotation periods of between 50 and 200 days. The object with the longest period has a rotation period of 2551.7 days. We present astrophysical parameters and a Hertzsprung-Russell diagram for the complete sample of known ssrAp stars. With very few exceptions, the ssrAp stars are grouped in the middle of the main sequence with ages in excess of 150 Myr. ZTF J021309.72+582827.7 was identified as a possible binary star harbouring an Ap star and a cool component, possibly shrouded in dust. Conclusions: With our study, we enlarge the sample of known ssrAp stars by about 150%, paving the way for more in-depth statistical studies.
ER  -

HUEMMERICH, Stefan; Klaus BERNHARD and Ernst PAUNZEN. A new sample of super-slowly rotating Ap (ssrAp) stars from the Zwicky Transient Facility survey. \textit{Astronomy and Astrophysics}. EDP Sciences, 2024, vol.~692, December, p.~1-10. ISSN~0004-6361. Available from: https://dx.doi.org/10.1051/0004-6361/202452075.

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