Periodic variable A-F spectral type stars in the southern TESS continuous viewing zone: I. Identification and classification

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00597510" target="_blank" >RIV/67985815:_____/24:00597510 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/24:00136828

Result on the web

<a href="https://hdl.handle.net/11104/0355446" target="_blank" >https://hdl.handle.net/11104/0355446</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202450711" target="_blank" >10.1051/0004-6361/202450711</a>

Result language

angličtina

Original language name

Periodic variable A-F spectral type stars in the southern TESS continuous viewing zone: I. Identification and classification

Original language description

Aims. Our primary objective is to accurately identify and classify the variability of A-F stars in the southern continuous viewing zone of the TESS satellite. The brightness limit was set to 10 mag to ensure the utmost reliability of our results and allow for spectroscopic follow-up observations using small telescopes. We aim to compare our findings with existing catalogues of variable stars. Methods. The light curves from TESS and their Fourier transform were used to manually classify stars in our sample. Cross-matching with other catalogues was performed to identify contaminants and false positives. Results. We have identified 1171 variable stars (51% of the sample). Among these variable stars, 67% have clear classifications, which includes delta Sct and gamma Dor pulsating stars and their hybrids, rotationally variables, and eclipsing binaries. We have provided examples of the typical representatives of variable stars and discussed the ambiguous cases. We found 20 pairs of stars with the same frequencies and identified the correct source of the variations. Additionally, we found that the variations in 12 other stars are caused by contamination from the light of faint nearby large-amplitude variable stars. To compare our sample with other variable star catalogues, we have defined two parameters reflecting the agreement in identification of variable stars and their classification. This comparison reveals intriguing disagreements in classification ranging from 52 to 100%. However, if we assume that stars without specific types are only marked as variable, then the agreement is relatively good, ranging from 57 to 85% (disagreement 15-43%). We have demonstrated that the TESS classification is superior to the classification based on other photometric surveys. Conclusions. The classification of stellar variability is complex and requires careful consideration. Caution should be exercised when using catalogue classifications.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/LTT20015" target="_blank" >LTT20015: PLATOSpec ground based support of space missions PLATO and TESS - new Czech spectrograph in collaboration with European Southern Observatory</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

688

Issue of the periodical within the volume

Aug.

Country of publishing house

FR - FRANCE

Number of pages

10

Pages from-to

A25

UT code for WoS article

001280641700027

EID of the result in the Scopus database

2-s2.0-85200247235