J 2016

The SERMON project: 48 new field Blazhko stars and an investigation of modulation-period distribution

SKARKA, Marek, Jiří LIŠKA, Reinhold Friedrich AUER, Zdeněk PRUDIL, Anna JURÁŇOVÁ et. al.

Basic information

Original name

The SERMON project: 48 new field Blazhko stars and an investigation of modulation-period distribution

Authors

SKARKA, Marek (203 Czech Republic, guarantor, belonging to the institution), Jiří LIŠKA (203 Czech Republic, belonging to the institution), Reinhold Friedrich AUER (276 Germany), Zdeněk PRUDIL (203 Czech Republic, belonging to the institution), Anna JURÁŇOVÁ (203 Czech Republic, belonging to the institution) and Ádám SÓDOR (348 Hungary)

Edition

Astronomy and Astrophysics, Les Ulis, EDP SCIENCES S A, 2016, 1432-0746

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

France

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 5.014

RIV identification code

RIV/00216224:14310/16:00092434

Organization unit

Faculty of Science

DOI

UT WoS

000384722600164

Keywords in English

stars: variables: RR Lyrae; stars: horizontal-branch; methods: statistical

Tags

Tags

International impact, Reviewed
Změněno: 24/2/2020 15:40, Mgr. Marie Šípková, DiS.

Abstract

V originále

We investigated 1234 fundamental mode RR Lyrae stars observed by the All Sky Automated Survey (ASAS) to identify the Blazhko (BL) effect. A sample of 1547 BL stars from the literature was collected to compare the modulation-period distribution with stars newly identified in our sample. A classical frequency spectra analysis was performed using Period04 software. Data points from each star from the ASAS database were analysed individually to avoid confusion with artificial peaks and aliases. Statistical methods were used in the investigation of the modulation-period distribution. Altogether we identified 87 BL stars (48 new detections), 7 candidate stars, and 22 stars showing long-term period variations. The distribution of modulation periods of newly identified BL stars corresponds well to the distribution of modulation periods of stars located in the Galactic field, Galactic bulge, Large Magellanic Cloud, and globular cluster M5 collected from the literature. As a very important by-product of this comparison, we found that pulsation periods of BL stars follow Gaussian distribution with the mean period of 0.54 +- 0.07 d, while the modulation periods show log-normal distribution with centre at log (Pm [d]) = 1.78 +- 0.30 dex. This means that 99.7 % of all known modulated stars have BL periods between 7.6 and 478 days. We discuss the identification of long modulation periods and show, that a significant percentage of stars showing long-term period variations could be classified as BL stars.