<p>We present an investigation of the classical nova V615 Vul that erupted on July 29, 2024. The results obtained are based on our multicolor observations at AI SAS, the M. R. Štefánik Observatory in Hlohovec and MAO NASU, as well as photometry from the AAVSO and ASAS-SN database. We also present spectral observations obtained with the 1.3-meter telescope at Skalnaté Pleso Observatory, when the very broad asymmetric H<sub><i>α</i></sub> emission line dominated during the nova’s decline. From the constructed light curves, we determined the brightness decay rates at 2 and 3 magnitudes, obtaining <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq1.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>t</mi> <mrow> <mn>2</mn> <mo>,</mo> <mi>V</mi> </mrow> </msub> <mo>=</mo> <msup> <mn>5</mn> <mi>d</mi> </msup> </math></EquationSource> <EquationSource Format="TEX">$t_{2,V} = 5^{d}$</EquationSource> </InlineEquation>.2, <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq2.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>t</mi> <mrow> <mn>3</mn> <mo>,</mo> <mi>V</mi> </mrow> </msub> <mo>=</mo> <msup> <mn>8</mn> <mi>d</mi> </msup> </math></EquationSource> <EquationSource Format="TEX">$t_{3,V} = 8^{d}$</EquationSource> </InlineEquation>.9 and <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq3.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="73" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>t</mi> <mrow> <mn>3</mn> <mo>,</mo> <mi>B</mi> </mrow> </msub> <mo>=</mo> <msup> <mn>11</mn> <mi>d</mi> </msup> </math></EquationSource> <EquationSource Format="TEX">$t_{3,B} = 11^{d}$</EquationSource> </InlineEquation>.6, which corresponds to very fast novae. The light curve shows a variation with a period of 6.5 days from day 12 to about day 90 after the outburst maximum. We also detected and analyzed short-term variations in <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq4.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>V</mi> </math></EquationSource> <EquationSource Format="TEX">$V$</EquationSource> </InlineEquation>, <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>R</mi> <mi>c</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$R_{c}$</EquationSource> </InlineEquation> and <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq6.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>I</mi> <mi>c</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$I_{c}$</EquationSource> </InlineEquation> starting around day 35. We suppose that the found oscillation of 0<sup><i>d</i></sup>.2238 ± 0.005 is the orbital period of V615 Vul. We calculated color indices and estimated the color temperature of the system. The tracks in the <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq7.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="56" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>V</mi> <mo>−</mo> <msub> <mi>R</mi> <mi>c</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$V-R_{c}$</EquationSource> </InlineEquation> and <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq8.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="55" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <msub> <mi>R</mi> <mi>c</mi> </msub> <mo>−</mo> <msub> <mi>I</mi> <mi>c</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$R_{c}-I_{c}$</EquationSource> </InlineEquation> diagrams exhibit loop-like variations caused by the broad H<sub><i>α</i></sub> emission line, while the tracks in <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq9.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="52" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>U</mi> <mo>−</mo> <mi>B</mi> </math></EquationSource> <EquationSource Format="TEX">$U-B$</EquationSource> </InlineEquation>/<InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10509_2025_4498_Article_IEq10.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>B</mi> <mo>−</mo> <mi>V</mi> </math></EquationSource> <EquationSource Format="TEX">$B-V$</EquationSource> </InlineEquation> diagram reflect changes in color temperature during the outburst&#xa0;- behavior typical of many cataclysmic variables and novae. We also estimated the main parameters of the system, such as the absolute magnitude, distance, extinction, and mass of the white dwarf.</p>

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Analysis of photometric and spectroscopic observations of classical nova V615 Vul

  • Viktoriia Krushevska,
  • Sergey Shugarov,
  • Theodor Pribulla,
  • Yuliana Kuznyetsova,
  • Mykola Petrov,
  • Maksym Andreev,
  • Karol Petrík,
  • Pavol Dubovský

摘要

We present an investigation of the classical nova V615 Vul that erupted on July 29, 2024. The results obtained are based on our multicolor observations at AI SAS, the M. R. Štefánik Observatory in Hlohovec and MAO NASU, as well as photometry from the AAVSO and ASAS-SN database. We also present spectral observations obtained with the 1.3-meter telescope at Skalnaté Pleso Observatory, when the very broad asymmetric Hα emission line dominated during the nova’s decline. From the constructed light curves, we determined the brightness decay rates at 2 and 3 magnitudes, obtaining t 2 , V = 5 d $t_{2,V} = 5^{d}$ .2, t 3 , V = 8 d $t_{3,V} = 8^{d}$ .9 and t 3 , B = 11 d $t_{3,B} = 11^{d}$ .6, which corresponds to very fast novae. The light curve shows a variation with a period of 6.5 days from day 12 to about day 90 after the outburst maximum. We also detected and analyzed short-term variations in V $V$ , R c $R_{c}$ and I c $I_{c}$ starting around day 35. We suppose that the found oscillation of 0d.2238 ± 0.005 is the orbital period of V615 Vul. We calculated color indices and estimated the color temperature of the system. The tracks in the V R c $V-R_{c}$ and R c I c $R_{c}-I_{c}$ diagrams exhibit loop-like variations caused by the broad Hα emission line, while the tracks in U B $U-B$ / B V $B-V$ diagram reflect changes in color temperature during the outburst - behavior typical of many cataclysmic variables and novae. We also estimated the main parameters of the system, such as the absolute magnitude, distance, extinction, and mass of the white dwarf.