The Photometric Variability and Spectrum of the Hot Post-AGB Star IRAS 21546+4721

Авторы: Ikonnikova Natalia, Burlak Marina, Dodin Alexander
Журнал: Galaxies
Том: 13
Номер: 2
Год издания: 2025
Первая страница: 31
Последняя страница: 31
DOI: 10.3390/galaxies13020031
Аннотация: We present the results of photometric and spectroscopic observations of a poorlystudied B-type supergiant with infrared excess, the hot post-AGB star IRAS 21546+4721.Based on our photometric observations in the UBVR_CI_C bands, we detected rapid, night-to-night, non-periodic brightness variations in the star with peak-to-peak amplitudes up to0.3 mag in the V band, as well as color–color and color–brightness correlations. Based on itsvariability characteristics, IRAS 21546+4721 appears similar to other hot post-AGB stars.Possible causes of the photometric variability are discussed. Additionally, we acquiredlow-resolution spectra in a wavelength range from 3500 to 7500 Å. The spectrum containsabsorption lines typical of an early B-type star, along with a set of emission lines of HI,He I, [O I], [O II], [N II], [S II], and CII originating from an ionized circumstellar envelope. An analysis of the emission spectrum allowed us to estimate the parameters of the gasenvelope (Ne ∼ 10^4 cm−3, Te ∼ 10,000 K) and the star’s temperature (∼26,500 K). The radialvelocity measured from the emission lines was Vr = −141 ± 7 km s−1.
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