A1 Refereed original research article in a scientific journal
Dynamical mass of the white dwarf in XY Ari: a test for intermediate polar X-ray spectral models
Authors: Álvarez-Hernández A., Torres M.A.P., Rodríguez-Gil P., Shahbaz T, Sánchez-Sierras J., Acosta-Pulido J.A., Jonker P.G., Gazeas K.D., Hakala P., Corral-Santana J.M.
Publisher: OXFORD UNIV PRESS
Publication year: 2023
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 524
Issue: 3
First page : 3314
Last page: 3323
Number of pages: 10
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/stad2010
Web address : https://doi.org/10.1093/mnras/stad2010
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/181192053
We present a dynamical study of the eclipsing intermediate polar XY Ari based on time-resolved near-infrared spectroscopy obtained with the EMIR spectrograph on the 10.4-m Gran Telescopio Canarias. Using main sequence template spectra taken with the same instrument setup as the target spectra, we measure a radial velocity amplitude of the late K- type donor star K2 = 256 ± 2 km s-1. We also obtain the rotational broadening of its photospheric lines vrot sin i = 141 ± 3 km s-1. From these and the eclipse geometry, we derive a donor-to-white dwarf mass ratio q = M2/M1 = 0.62 ± 0.02, an orbital inclination i = 80.8° ± 0.5° and dynamical masses M1 = 1.21 ± 0.04 M⊙ and M2 = 0.75 ± 0.04 M⊙ (1σ). This result places the white dwarf in XY Ari as one of the three most massive known in a cataclysmic variable. Comparison with white dwarf mass estimates from X-ray spectral studies could indicate the necessity of an improvement of the X-ray models and/or analysis techniques, as a number of X-ray white dwarf masses are in disagreement with the dynamical mass value.
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