A Binary Nature of the Marginal CP Star Sigma Sculptoris

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00100880" target="_blank" >RIV/00216224:14310/18:00100880 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/1538-3873/aab142" target="_blank" >http://dx.doi.org/10.1088/1538-3873/aab142</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1538-3873/aab142" target="_blank" >10.1088/1538-3873/aab142</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A Binary Nature of the Marginal CP Star Sigma Sculptoris

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

A Binary Nature of the Marginal CP Star Sigma Sculptoris

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Publications of the Astronomical Society of the Pacific

ISSN

0004-6280

e-ISSN

1538-3873

Svazek periodika

130

Číslo periodika v rámci svazku

987

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

1-11

Kód UT WoS článku

000429006800001

EID výsledku v databázi Scopus

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