Monitoring Period Variations of Variable Stars using Precise
Photometric Surveys

D 2019

Monitoring Period Variations of Variable Stars using Precise Photometric Surveys

MIKULÁŠEK, Zdeněk; Miloslav ZEJDA; S. HÜMMERICH; Jiří KRTIČKA; K. BERNHARD et. al.

Basic information

Original name

Monitoring Period Variations of Variable Stars using Precise Photometric Surveys

Authors

MIKULÁŠEK, Zdeněk (203 Czech Republic, guarantor, belonging to the institution); Miloslav ZEJDA (203 Czech Republic, belonging to the institution); S. HÜMMERICH; Jiří KRTIČKA (203 Czech Republic, belonging to the institution); K. BERNHARD; Ernst PAUNZEN (40 Austria, belonging to the institution); Marek SKARKA (203 Czech Republic); S. DE VILLIERS; Miroslav JAGELKA (703 Slovakia, belonging to the institution) and Volkan BAKIS (792 Turkey)

Edition

Neuveden, Symposium S339 (Southern Horizons in Time-Domain Astronomy), p. 110-113, 4 pp. 2019

Publisher

Cambridge University Press

Other information

Language

English

Type of outcome

Proceedings paper

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

is not subject to a state or trade secret

Publication form

printed version "print"

References:

URL

RIV identification code

RIV/00216224:14310/19:00108284

Organization unit

Faculty of Science

ISSN

DOI

https://doi.org/10.1017/S174392131800234X

EID Scopus

2-s2.0-85071579610

Keywords in English

methods: statistical; surveys; stars: chemically peculiar; stars: rotation; stars: spots; binaries: general; stars: low mass

Abstract

In the original language

The period variations of rotating, pulsating and eclipsing variable stars bear valuable astrophysical information about the presence of companions, evolutionary effects, and the inner structure of the stars. This talk described a universal method for de-trending and re-scaling precise photometric data (Kepler, MOST, CoRoT, OGLE, …) appropriate for period-change diagnostics of periodic variables. We demonstrated the potential of the method by analysing the period variability of one of the newly-identified Kepler magnetic chemically-peculiar (mCP) stars. We showed that, surprisingly, our target star displays near-sinusoidal changes in its observed light-variations, with a period of 2.85(6) years, which is apparently the result of the presence of a nearby stellar companion. The expected long-term changes of the rotational period, as have been observed in several mCP stars, have not been identified among the sample of Kepler mCP stars.

Links

GA16-01116S, research and development project

Name: Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Investor: Czech Science Foundation

LG15010, research and development project

Name: F. Magellanes: projekt podpory studia hvězd a hvězdných soustav na základě pozorování ze Země a z kosmického prostoru (Acronym: Magellan2015)

Investor: Ministry of Education, Youth and Sports of the CR

Cite

MIKULÁŠEK, Zdeněk; Miloslav ZEJDA; S. HÜMMERICH; Jiří KRTIČKA; K. BERNHARD; Ernst PAUNZEN; Marek SKARKA; S. DE VILLIERS; Miroslav JAGELKA and Volkan BAKIS. Monitoring Period Variations of Variable Stars using Precise Photometric Surveys. In Elizabeth R. Griffin. Symposium S339 (Southern Horizons in Time-Domain Astronomy). Neuveden: Cambridge University Press, 2019, p. 110-113. ISSN 1743-1913. Available from: https://doi.org/10.1017/S174392131800234X.

@inproceedings{1648116,
   author = {Mikulášek, Zdeněk and Zejda, Miloslav and Hümmerich, S. and Krtička, Jiří and Bernhard, K. and Paunzen, Ernst and Skarka, Marek and De Villiers, S. and Jagelka, Miroslav and Bakis, Volkan},
   address = {Neuveden},
   booktitle = {Symposium S339 (Southern Horizons in Time-Domain Astronomy)},
   doi = {https://doi.org/10.1017/S174392131800234X},
   editor = {Elizabeth R. Griffin},
   keywords = {methods: statistical; surveys; stars: chemically peculiar; stars: rotation; stars: spots; binaries: general; stars: low mass},
   howpublished = {tištěná verze "print"},
   language = {eng},
   location = {Neuveden},
   pages = {110-113},
   publisher = {Cambridge University Press},
   title = {Monitoring Period Variations of Variable Stars using Precise Photometric Surveys},
   url = {https://doi.org/10.1017/S174392131800234X},
   year = {2019}
}

TY  - CONF
ID  - 1648116
AU  - Mikulášek, Zdeněk - Zejda, Miloslav - Hümmerich, S. - Krtička, Jiří - Bernhard, K. - Paunzen, Ernst - Skarka, Marek - De Villiers, S. - Jagelka, Miroslav - Bakis, Volkan
PY  - 2019
TI  - Monitoring Period Variations of Variable Stars using Precise Photometric Surveys
PB  - Cambridge University Press
CY  - Neuveden
KW  - methods: statistical
KW  - surveys
KW  - stars: chemically peculiar
KW  - stars: rotation
KW  - stars: spots
KW  - binaries: general
KW  - stars: low mass
UR  - https://doi.org/10.1017/S174392131800234X
L2  - https://doi.org/10.1017/S174392131800234X
N2  - The period variations of rotating, pulsating and eclipsing variable stars bear valuable astrophysical information about the presence of companions, evolutionary effects, and the inner structure of the stars. This talk described a universal method for de-trending and re-scaling precise photometric data (Kepler, MOST, CoRoT, OGLE, …) appropriate for period-change diagnostics of periodic variables. We demonstrated the potential of the method by analysing the period variability of one of the newly-identified Kepler magnetic chemically-peculiar (mCP) stars. We showed that, surprisingly, our target star displays near-sinusoidal changes in its observed light-variations, with a period of 2.85(6) years, which is apparently the result of the presence of a nearby stellar companion. The expected long-term changes of the rotational period, as have been observed in several mCP stars, have not been identified among the sample of Kepler mCP stars.
ER  -

MIKULÁŠEK, Zdeněk; Miloslav ZEJDA; S. HÜMMERICH; Jiří KRTIČKA; K. BERNHARD; Ernst PAUNZEN; Marek SKARKA; S. DE VILLIERS; Miroslav JAGELKA and Volkan BAKIS. Monitoring Period Variations of Variable Stars using Precise Photometric Surveys. In Elizabeth R. Griffin. \textit{Symposium S339 (Southern Horizons in Time-Domain Astronomy)}. Neuveden: Cambridge University Press, 2019, p.~110-113. ISSN~1743-1913. Available from: https://doi.org/10.1017/S174392131800234X.

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