J 2016

NEW PHOTOMETRICALLY VARIABLE MAGNETIC CHEMICALLY PECULIAR STARS IN THE ASAS-3 ARCHIVE

HUMMERICH, Stefan, Ernst PAUNZEN and Klaus BERNHARD

Basic information

Original name

NEW PHOTOMETRICALLY VARIABLE MAGNETIC CHEMICALLY PECULIAR STARS IN THE ASAS-3 ARCHIVE

Authors

HUMMERICH, Stefan (276 Germany), Ernst PAUNZEN (40 Austria, belonging to the institution) and Klaus BERNHARD (276 Germany)

Edition

Astronomical Journal, BRISTOL, Springer Science+Business Media, 2016, 0004-6256

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 2.609

RIV identification code

RIV/00216224:14310/16:00092549

Organization unit

Faculty of Science

DOI

UT WoS

000385749000002

Keywords in English

stars: chemically peculiar; stars: individual (V414 Pup); stars: rotation; stars: variables: general

Tags

Změněno: 7/4/2017 14:00, Ing. Andrea Mikešková

Abstract

V originále

The magnetic Ap or CP2 stars are natural atomic and magnetic laboratories. Strictly periodic changes are observed in the spectra and brightness of these stars, which allow the derivation of rotational periods. Related to this group of objects are the He-weak (CP4) and He-rich stars, some of which also undergo brightness changes due to rotational modulation. Increasing the sample size of known rotational periods among CP2/4 stars is important and will contribute to our understanding of these objects and their evolution in time. We have compiled an extensive target list of CP2/4 stars from the General Catalog of Ap, HgMn, and Am stars, including several early-type (spectral types B/A) variables of undetermined type from the International Variable Star Index. We investigated our sample stars using publicly available observations from the ASAS-3 archive. Our previous efforts in this respect led to the discovery of 323 variable stars. Using a refined analysis approach, we were able to identify another 360 stars exhibiting photometric variability in ASAS-3 data. Summary data, folded light curves and, if available, information from the literature are presented for our final sample, which is composed of 334 bona-fide alpha(2) Canum Venaticorum (ACV) variables, 23 ACV candidates, and 3 eclipsing binary systems. Interesting and unusual objects are discussed in detail. In particular, we call attention to HD 66051 (V414 Pup), which is an eclipsing binary system showing obvious rotational modulation of the light curve due to the presence of an ACV variable in the system.

Links

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