Evolutionary Status of W Vir Pulsating Variables

Fadeyev, Yu. A.

doi:10.1134/s106377372011002x

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…The method is based on consistent calculations of stellar evolution and nonlinear stellar pulsations where selected models of evolutionary sequences are used as initial conditions in solution of the Cauchy problem for the equations of radiation hydrodynamics and time-dependent convection describing radial stellar pulsations. Earlier this method was employed for determination of the fundamental parameters of the Cepheids α UMi (Fadeyev 2015a) and SZ Tau (2015b) as well as of groups of long-period (Fadeyev 2018) and short-period Cepheids (Fadeyev 2020). Efficiency of the method is confirmed by a good agreement (within several percent) of the results of theoretical computations with Baade-Wesselink radius measurements for long-period Cepheids RS Pup, GY Sge and SV Vul.…”

Section: Introductionmentioning

confidence: 99%

“…Evolutionary computations were done with the program MESA version 12115 (Paxton et al 2018). Calculations of evolutionary sequences and nonlinear stellar pulsations are discussed in our preceding paper (Fadeyev 2020). Initial conditions necessary for solution of the equations of hydrodynamics were obtained from selected models of evolutionary sequences with initial…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary status and fundamental parameters of the Cepheid V1033 Cyg

Fadeyev

2020

Preprint

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On the basis of consistent stellar evolution and nonlinear stellar pulsation calculations the Cepheid V1033 Cyg is shown to be the post-main sequence star at the first crossing of the instability strip during gravitational contraction of the helium core. The observed light variability of V1033 Cyg is due to radial oscillations in the fundamental mode. The best agreement (within one percent) between recent observations and the theoretical estimate of the period change rate was obtained for the evolutionary sequence with stellar mass M = 6.3M and helium and heavier element fractional abundances Y = 0.28 and Z = 0.022, respectively.The age of the star, the luminosity, the radius, the effective temperature and the surface gravity are t ev = 5.84 × 10 7 yr, L = 2009L , R = 45.6R , T eff = 5726 K, log g = 1.92.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evolutionary status and fundamental parameters of the Cepheid V1033 Cyg

Fadeyev

2020

Preprint

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Post-AGB candidate IRAS 02143+5852: Cepheid-like variability, three-layer circumstellar dust envelope and spectral features

Ikonnikova,

Burlak,

Dodin

et al. 2024

Monthly Notices of the Royal Astronomical Society

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We present the results of multicolour UBVRCICJHK photometry, spectroscopic analysis and spectral energy distribution (SED) modelling for the post-AGB candidate IRAS 02143+5852. We detected Cepheid-like light variations with the full peak-to-peak amplitude ΔV ∼ 0.9 mag and the pulsation period of about 24.9 d. The phased light curves appeared typical for the W Vir Cepheids. The period-luminosity relation for the Type II Cepheids yielded the luminosity log L/L⊙ ∼ 2.95. From a low-resolution spectrum, obtained at maximum brightness, the following atmospheric parameters were determined: Teff ∼ 7400 K and log g ∼ 1.38. This spectrum contains the emission lines Hα, ${\rm Ba\, \small {II}}$ λ6496.9, ${\rm He\, \small {I}}$λ10830 and Paβ. Spectral monitoring performed in 2019–2021 showed a significant change in the Hα profile and appearance of CH and CN molecular bands with pulsation phase. The metal lines are weak. Unlike typical W Vir variables, the star shows a strong excess of infrared radiation associated with the presence of a heavy dust envelope around the star. We modelled the SED using our photometry and archival data from different catalogues and determined the parameters of the circumstellar dust envelope. We conclude that IRAS 02143+5852 is a low-luminosity analogue of dusty RV Tau stars.

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Changes in the Period of V420 Cen, a W Vir-Type Cepheid

Бердников

2021

Astron. Lett.

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Evolutionary Status of W Vir Pulsating Variables

Cited by 5 publications

References 28 publications

Evolutionary status and fundamental parameters of the Cepheid V1033 Cyg

Evolutionary status and fundamental parameters of the Cepheid V1033 Cyg

Post-AGB candidate IRAS 02143+5852: Cepheid-like variability, three-layer circumstellar dust envelope and spectral features

Changes in the Period of V420 Cen, a W Vir-Type Cepheid

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