The Kepler view of magnetic chemically peculiar stars

J 2018

The Kepler view of magnetic chemically peculiar stars

HÜMMERICH, Stefan; Zdeněk MIKULÁŠEK; Ernst PAUNZEN; Klaus BERNHARD; Jan JANÍK et al.

Základní údaje

Originální název

The Kepler view of magnetic chemically peculiar stars

Autoři

HÜMMERICH, Stefan; Zdeněk MIKULÁŠEK; Ernst PAUNZEN; Klaus BERNHARD; Jan JANÍK ; Iliya YAKUNIN; Theodor PRIBULLA; Martin VAŇKO a Lenka MATĚCHOVÁ

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2018, 1432-0746

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/18:00101367

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: chemically peculiar; stars: abundances; stars: atmospheres; stars: rotation; stars: variables: general

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 30. 4. 2019 09:22, Mgr. Tereza Miškechová

Anotace

V originále

Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The advent of space-based photometry provides the opportunity for the first precise characterizations of the photometric variability properties of these stars, which might advance our understanding of the processes involved and the atmospheric structures of mCP stars. Aims. We carried out a search for new mCP stars in the Kepler field with the ultimate aim of investigating their photometric variability properties using Kepler data. As an aside, we describe criteria for selecting mCP star candidates based on light curve properties, and assess the accuracy of the spectral classifications provided by the MKCLASS code. Methods. As only very few known mCP stars are situated in the Kepler field, we had to depend largely on alternative (nonspectroscopic) means of identifying suitable candidates that rely mostly on light curve properties; in particular we relied on monoperiodic variability and light curve stability. Newly acquired and archival spectra were used to confirm most of our mCP star candidates. Linear ephemeris parameters and effective amplitudes were derived from detrended Kepler data. Results. Our final sample consists of 41 spectroscopically confirmed mCP stars of which 39 are new discoveries, 5 candidate mCP stars, and 7 stars in which no chemical peculiarities could be established. Our targets populate the whole age range from zero-age main sequence to terminal-age main sequence and are distributed in the mass interval from 1.5 M-circle dot to 4 M-circle dot. About 25% of the mCP stars show a hitherto unobserved wealth of detail in their light curves indicative of complex surface structures. We identified light curve stability as a primary criterion for identifying mCP star candidates among early-type stars in large photometric surveys, and prove the reliability of the spectral classifications provided by the MKCLASS code.

Návaznosti

GA16-01116S, projekt VaV

Název: Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Investor: Grantová agentura ČR, Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Citovat

HÜMMERICH, Stefan; Zdeněk MIKULÁŠEK; Ernst PAUNZEN; Klaus BERNHARD; Jan JANÍK; Iliya YAKUNIN; Theodor PRIBULLA; Martin VAŇKO a Lenka MATĚCHOVÁ. The Kepler view of magnetic chemically peculiar stars. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2018, roč. 619, A98, s. 1-20. ISSN 1432-0746. Dostupné z: https://doi.org/10.1051/0004-6361/201832938.

@article{1470997,
   author = {Hümmerich, Stefan and Mikulášek, Zdeněk and Paunzen, Ernst and Bernhard, Klaus and Janík, Jan and Yakunin, Iliya and Pribulla, Theodor and Vaňko, Martin and Matěchová, Lenka},
   article_location = {LES ULIS CEDEX A},
   article_number = {A98},
   doi = {https://doi.org/10.1051/0004-6361/201832938},
   keywords = {stars: chemically peculiar; stars: abundances; stars: atmospheres; stars: rotation; stars: variables: general},
   language = {eng},
   issn = {1432-0746},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {The Kepler view of magnetic chemically peculiar stars},
   volume = {619},
   year = {2018}
}

TY  - JOUR
ID  - 1470997
AU  - Hümmerich, Stefan - Mikulášek, Zdeněk - Paunzen, Ernst - Bernhard, Klaus - Janík, Jan - Yakunin, Iliya - Pribulla, Theodor - Vaňko, Martin - Matěchová, Lenka
PY  - 2018
TI  - The Kepler view of magnetic chemically peculiar stars
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 619
IS  - A98
SP  - 1-20
EP  - 1-20
PB  - EDP SCIENCES S A
SN  - 14320746
KW  - stars: chemically peculiar
KW  - stars: abundances
KW  - stars: atmospheres
KW  - stars: rotation
KW  - stars: variables: general
N2  - Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The advent of space-based photometry provides the opportunity for the first precise characterizations of the photometric variability properties of these stars, which might advance our understanding of the processes involved and the atmospheric structures of mCP stars. Aims. We carried out a search for new mCP stars in the Kepler field with the ultimate aim of investigating their photometric variability properties using Kepler data. As an aside, we describe criteria for selecting mCP star candidates based on light curve properties, and assess the accuracy of the spectral classifications provided by the MKCLASS code. Methods. As only very few known mCP stars are situated in the Kepler field, we had to depend largely on alternative (nonspectroscopic) means of identifying suitable candidates that rely mostly on light curve properties; in particular we relied on monoperiodic variability and light curve stability. Newly acquired and archival spectra were used to confirm most of our mCP star candidates. Linear ephemeris parameters and effective amplitudes were derived from detrended Kepler data. Results. Our final sample consists of 41 spectroscopically confirmed mCP stars of which 39 are new discoveries, 5 candidate mCP stars, and 7 stars in which no chemical peculiarities could be established. Our targets populate the whole age range from zero-age main sequence to terminal-age main sequence and are distributed in the mass interval from 1.5 M-circle dot to 4 M-circle dot. About 25% of the mCP stars show a hitherto unobserved wealth of detail in their light curves indicative of complex surface structures. We identified light curve stability as a primary criterion for identifying mCP star candidates among early-type stars in large photometric surveys, and prove the reliability of the spectral classifications provided by the MKCLASS code.
ER  -

HÜMMERICH, Stefan; Zdeněk MIKULÁŠEK; Ernst PAUNZEN; Klaus BERNHARD; Jan JANÍK; Iliya YAKUNIN; Theodor PRIBULLA; Martin VAŇKO a Lenka MATĚCHOVÁ. The Kepler view of magnetic chemically peculiar stars. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2018, roč.~619, A98, s.~1-20. ISSN~1432-0746. Dostupné z: https://doi.org/10.1051/0004-6361/201832938.

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