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@article{1413069,
author = {Janík, Jan and Krtička, Jiří and Mikulášek, Zdeněk and Zverko, Juraj and Pintado, Olga and Paunzen, Ernst and Prvák, Milan and Skalický, Jan and Zejda, Miloslav and Adam, Christian},
article_number = {987},
doi = {http://dx.doi.org/10.1088/1538-3873/aab142},
keywords = {stars: chemically peculiar; stars: early-type; stars: binaries: spectroscopic; stars: variables: general; stars: individual (sigma Scl)},
language = {eng},
issn = {0004-6280},
journal = {Publications of the Astronomical Society of the Pacific},
title = {A Binary Nature of the Marginal CP Star Sigma Sculptoris},
url = {http://iopscience.iop.org/article/10.1088/1538-3873/aab142/pdf},
volume = {130},
year = {2018}
}
TY - JOUR
ID - 1413069
AU - Janík, Jan - Krtička, Jiří - Mikulášek, Zdeněk - Zverko, Juraj - Pintado, Olga - Paunzen, Ernst - Prvák, Milan - Skalický, Jan - Zejda, Miloslav - Adam, Christian
PY - 2018
TI - A Binary Nature of the Marginal CP Star Sigma Sculptoris
JF - Publications of the Astronomical Society of the Pacific
VL - 130
IS - 987
SP - 1-11
EP - 1-11
SN - 00046280
KW - stars: chemically peculiar
KW - stars: early-type
KW - stars: binaries: spectroscopic
KW - stars: variables: general
KW - stars: individual (sigma Scl)
UR - http://iopscience.iop.org/article/10.1088/1538-3873/aab142/pdf
N2 - The A2 V star sigma Scl was suspected of being a low-amplitude rotating variable of the Ap-type star by several authors. Aiming to decide whether the star is a variable chemically peculiar (CP) star, we searched for the photometric and spectroscopic variability, and determined chemical abundances of sigma Scl. The possible variability was tested using several types of periodograms applied to the photometry from Long-Term Photometry of Variables project (LTPV) and Hipparcos. Sixty spectrograms of high signal-to-noise (S/N) were obtained and used for chemical analysis of the stellar atmosphere and for looking for spectral variability that is symptomatic for the CP stars. We did not find any signs of the light variability or prominent chemical peculiarity, that is specific for the CP stars. The only exception is the abundance of scandium, which is significantly lower than the solar one and yttrium and barium, which are strongly overabundant. As a by-product of the analysis, and with the addition of 29 further spectra, we found that sigma Scl is a single-lined spectroscopic binary with orbital period of 46.877(8) d. We argue that sigma Scl is not an Ap star, but rather a marginal Am star in SB1 system. The spectral energy distribution of the binary reveals infrared excess due to circumstellar material.
ER -
JANÍK, Jan, Jiří KRTIČKA, Zdeněk MIKULÁŠEK, Juraj ZVERKO, Olga PINTADO, Ernst PAUNZEN, Milan PRVÁK, Jan SKALICKÝ, Miloslav ZEJDA and Christian ADAM. A Binary Nature of the Marginal CP Star Sigma Sculptoris. \textit{Publications of the Astronomical Society of the Pacific}. 2018, vol.~130, No~987, p.~1-11. ISSN~0004-6280. Available from: https://dx.doi.org/10.1088/1538-3873/aab142.
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