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Abstract <p>Using our long-term <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(UBVRIRcIc\)</EquationSource> <!--AstEng2670021Volkova-m1--> </InlineEquation> photometry and TESS data for the little-studied system V491 Vul (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(V{{ = 9.97}^{m}}\)</EquationSource> <!--AstEng2670021Volkova-m2--> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(P = {{7.67}^{d}}\)</EquationSource> <!--AstEng2670021Volkova-m3--> </InlineEquation>, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(e = 0.33\)</EquationSource> <!--AstEng2670021Volkova-m4--> </InlineEquation>, Sp 08 V + 09 V), the following absolute parameters: <i>T</i><sub>1</sub> = <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(42\,300 \pm 1000\)</EquationSource> <!--AstEng2670021Volkova-m5--> </InlineEquation> K, <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\({{M}_{1}} = 17.6 \pm 2{\kern 1pt} {{M}_{ \odot }}\)</EquationSource> <!--AstEng2670021Volkova-m6--> </InlineEquation>, and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\({{R}_{1}} = 5.7 \pm 0.2{\kern 1pt} {{R}_{ \odot }}\)</EquationSource> <!--AstEng2670021Volkova-m7--> </InlineEquation>, <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\({{T}_{2}} = 35\,900 \pm 1000\)</EquationSource> <!--AstEng2670021Volkova-m8--> </InlineEquation> K, <i>M</i><sub>2</sub> = 14.2 ± <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(1.5{\kern 1pt} {{M}_{ \odot }}\)</EquationSource> <!--AstEng2670021Volkova-m9--> </InlineEquation>, and <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\({{R}_{2}} = 5.2 \pm 0.2{\kern 1pt} {{R}_{ \odot }}\)</EquationSource> <!--AstEng2670021Volkova-m10--> </InlineEquation> have been obtained for the first time, the apsidal period of <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\({{P}_{{{\text{aps}}}}} = 1048 \pm \)</EquationSource> <!--AstEng2670021Volkova-m11--> </InlineEquation> 11&#xa0;years is very close to the theoretical value under the condition of synchronism. The photometric parallax of <InlineEquation ID="IEq12"> <EquationSource Format="TEX">\(\pi =0.00053^{''} \)</EquationSource> <!--AstEng2670021Volkova-m12--> </InlineEquation> (<InlineEquation ID="IEq13"> <EquationSource Format="TEX">\(d = 1.89\)</EquationSource> <!--AstEng2670021Volkova-m13--> </InlineEquation> kpc) is somewhat higher than the value of Gaia DR3. The age of the system is estimated at 10&#xa0;mln&#xa0;years.</p>

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V491 Vul—Massive Eclipsing Star in S87 Diffuse Nebula Region

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • A. S. Volkova,
  • I. M. Volkov

摘要

Abstract

Using our long-term \(UBVRIRcIc\) photometry and TESS data for the little-studied system V491 Vul ( \(V{{ = 9.97}^{m}}\) , \(P = {{7.67}^{d}}\) , \(e = 0.33\) , Sp 08 V + 09 V), the following absolute parameters: T1 = \(42\,300 \pm 1000\) K, \({{M}_{1}} = 17.6 \pm 2{\kern 1pt} {{M}_{ \odot }}\) , and \({{R}_{1}} = 5.7 \pm 0.2{\kern 1pt} {{R}_{ \odot }}\) , \({{T}_{2}} = 35\,900 \pm 1000\) K, M2 = 14.2 ± \(1.5{\kern 1pt} {{M}_{ \odot }}\) , and \({{R}_{2}} = 5.2 \pm 0.2{\kern 1pt} {{R}_{ \odot }}\) have been obtained for the first time, the apsidal period of \({{P}_{{{\text{aps}}}}} = 1048 \pm \) 11 years is very close to the theoretical value under the condition of synchronism. The photometric parallax of \(\pi =0.00053^{''} \) ( \(d = 1.89\) kpc) is somewhat higher than the value of Gaia DR3. The age of the system is estimated at 10 mln years.