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High-precision photometric and high-resolution spectroscopic characterization of HD 180347

Show simple item record Trust, Otto Mashonkina, Lyudmila Jurua, Edward Cat, Peter De Tsymbal, Vadim Joshi, Santosh 2024-02-20T08:51:53Z 2024-02-20T08:51:53Z 2023-09
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1454
dc.description.abstract We report the analysis of high-precision space-based photometric and high-resolution spectroscopic observations of HD 180347. The high-quality light curves from the Transiting Exoplanet Survey Satellite (TESS) under sectors 14, 15, and 26 were used. By visual inspection of the light curves and the Fourier transforms, only low-frequency signals (less than 1 d−1) were detected. After using wavelet, autocorrelation, and composite spectrum analyses, HD 180347 is classified as a rotational variable with a period of about 4.1 ± 0.2 d. In reference to the observation limit of TESS, no pulsations were detected. For the spectroscopic analysis, we used data collected with the High Efficiency and Resolution Mercator Echelle ´ Spectrograph (HERMES). We determined the spectral type of this star and obtained atmospheric parameters such as the effective temperature, the surface gravity, and the projected rotational, microturbulent, and radial velocities. We performed a detailed chemical abundance analysis. The LTE abundances were derived for 25 chemical elements. For 13 of them, including Ca, Sc, Sr, Zr, and Ba, which are important for the characterization of chemical peculiarities, we also present the non-local thermodynamic equilibrium (NLTE) abundances. NLTE improves the accuracy of the derived abundances and confirms that Ca and Sc are depleted in HD 180347 relative to their solar abundances, while the heavy elements beyond Sr are enhanced, by more than 0.7 dex. Based on the spectral class and the element abundance pattern, we classify this star as Am (kA1hA8mA8). en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries 2018;mnrs524-1044
dc.subject stars: abundances en_US
dc.subject stars: chemically peculiar en_US
dc.subject stars: fundamental parameters en_US
dc.subject stars: rotation en_US
dc.subject starspots en_US
dc.subject stars: individual: HD 180347 en_US
dc.title High-precision photometric and high-resolution spectroscopic characterization of HD 180347 en_US
dc.type Article en_US

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