Abstract <p>Based on optical and infrared survey data spanning <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11443_2025_11369_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="36" /> </InlineMediaObject> <EquationSource Format="TEX">\(\approx 20\)</EquationSource>  </InlineEquation> years of observations, the long-term variability of the polar V379 Vir with a brown dwarf secondary has been studied. By modeling the spectral energy distribution, we constrain the white dwarf’s mass to <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11443_2025_11369_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="156" /> </InlineMediaObject> <EquationSource Format="TEX">\(M_{1}=0.61\pm 0.05\;M_{\odot}\)</EquationSource>  </InlineEquation> and its effective temperature to <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11443_2025_11369_Article_IEq3.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="151" /> </InlineMediaObject> <EquationSource Format="TEX">\(T_{\textrm{eff}}=10\,930\pm 350\text{ K}\)</EquationSource>  </InlineEquation>. Near-infrared photometry yields a donor radius of <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11443_2025_11369_Article_IEq4.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="165" /> </InlineMediaObject> <EquationSource Format="TEX">\(R_{2}=0.095\pm 0.018\;R_{\odot}\)</EquationSource>  </InlineEquation> and temperature <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11443_2025_11369_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="140" /> </InlineMediaObject> <EquationSource Format="TEX">\(T_{\textrm{eff}}=1600\pm 180\text{ K}\)</EquationSource>  </InlineEquation>. Modeling of the cyclotron emission from the accretion spot, detected with the <i>Spitzer</i> infrared telescope, gives an accretion rate of <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11443_2025_11369_Article_IEq6.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="163" /> </InlineMediaObject> <EquationSource Format="TEX">\(\dot{M}\approx 3\times 10^{-13}\;M_{\odot}/\textrm{yr}\)</EquationSource>  </InlineEquation>. This rate is consistent with polars in a low accretion state, but significantly higher than expected from wind-driven mass transfer.</p>

On Accretion in the Polar V379 Vir

期刊论文
发表日期：

2025年2月1日

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M. V. Suslikov,
A. I. Kolbin,
N. V. Borisov

摘要

Abstract

Based on optical and infrared survey data spanning \(\approx 20\) years of observations, the long-term variability of the polar V379 Vir with a brown dwarf secondary has been studied. By modeling the spectral energy distribution, we constrain the white dwarf’s mass to \(M_{1}=0.61\pm 0.05\;M_{\odot}\) and its effective temperature to \(T_{\textrm{eff}}=10\,930\pm 350\text{ K}\) . Near-infrared photometry yields a donor radius of \(R_{2}=0.095\pm 0.018\;R_{\odot}\) and temperature \(T_{\textrm{eff}}=1600\pm 180\text{ K}\) . Modeling of the cyclotron emission from the accretion spot, detected with the Spitzer infrared telescope, gives an accretion rate of \(\dot{M}\approx 3\times 10^{-13}\;M_{\odot}/\textrm{yr}\) . This rate is consistent with polars in a low accretion state, but significantly higher than expected from wind-driven mass transfer.