Spectroscopic and photometric study of the new eclipsing polar Gaia23cer

• Main Authors: Kolbin, A. I, Pavlenko, E. P, Kochkina, V. Yu, Vinokurov, A. S, Shugarov, S. Yu, Sosnovskij, A. A, Antonyuk, K. A, Antonyuk, O. I, Pit, N. V, Suslikov, M. V, Galimova, E. K, Borisov, N. V, Burenkov, A. N, Spiridonova, O. I
• Format: Journal Article
• Language: English
• Published: 23-09-2024
• Subjects: Physics - High Energy Astrophysical Phenomena; Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.2409.15570

Astronomy Letters, vol. 50, No 5, pp.335-349 (2024) We present the results of the optical study of the new eclipsing polar
Gaia23cer. We analyzed the brightness variability of the polar in high
($\langle r \rangle \approx 16.5\mathrm{\,mag}$) and low ($\langle r \rangle
\approx 19.2\mathrm{\,mag}$) states. The system has an orbital period $P_{orb}
= 102.0665 \pm 0.0015$ min and exhibits deep eclipses with a duration $\Delta
t_{ecl} = 401.30 \pm 0.81$ s. The spectra have a red cyclotron continuum with
the Zeeman H$\alpha$ absorption triplet forming in a magnetic field with a
strength of $15.2 \pm 1.1$ MG. The source of emission lines has a high radial
velocity semiamplitude ($K\approx 450$km/s) and its eclipse lags behind the
eclipse of the white dwarf. The mass $M_1=0.79 \pm 0.03 M_{\odot}$ and
temperature $T=11350 \pm 650 K$ of the white dwarf have been found by modelling
the spectral energy distribution. The eclipse duration corresponds to a donor
mass $M_2 = 0.10-0.13M_{\odot}$ and an orbital inclination
$i=84.3-87.0^{\circ}$. The donor temperature was estimated to be $T\approx
2900K$ by modelling the elliptical variability and eclipse depth.