Astronomy & Astrophysics

$\begin{figure} \par\resizebox{6cm}{!}{\includegraphics[clip]{h4560f1.ps}} \end{figure}$ Figure 1: The B-band finding chart shows the $1 \times 1$ arcmin surroundings of V840 Oph; north is up, east is left. The three possible candidates for the old nova are indicated by the numbers that have been assigned by Duerbeck (1987).
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In the text

$\begin{figure} \par\rotatebox{-90}{\resizebox{!}{18.1cm}{\includegraphics[clip]{h4560f2.ps}}} \end{figure}$ Figure 2: Colour-colour diagrams are plotted for the three nova candidates and the surrounding field stars. While candidates 2 and 3 lie close to the main sequence (defined by the majority of field stars), the best candidate (No. 1) clearly stands out in all three diagrams.
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In the text

$\begin{figure} { \rotatebox{-90}{\resizebox{!}{14cm}{\includegraphics[clip]{h4560f3.ps}}} }\end{figure}$ Figure 3: Spectrum of candidate No. 1. Its nova character is confirmed by the presence of typical nova emission lines. Noteworthy are the strong He II line at $\lambda = 541$ nm and the presence of the C IV doublet at $\lambda = 580/1$ nm (not resolved).
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In the text

$\begin{figure} { \rotatebox{-90}{\resizebox{!}{13cm}{\includegraphics[clip]{h4560f4.ps}}} }\end{figure}$ Figure 4: Flux calibrated spectrum of V840 Oph (candidate 1), obtained in February 2003. The spectra has not been corrected for reddening. Apart from the high excitation lines already seen in the 2002 spectrum, the strong emission feature between $\lambda = 460$ and 475 nm (Bowen blend and He II) attracts attention.
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In the text

$\begin{figure} \par\rotatebox{-90}{\resizebox{!}{8.8cm}{\includegraphics[clip]{h4560f5.ps}}} \end{figure}$ Figure 5: A detailed view on the Bowen blend and He II $\lambda$ 469. Over the original spectrum the fits to the five ions are plotted as dotted line for N III, dashed line for C III, dash-dot line for C IV, dash-dot-dot line for O II, and long dashes for He II. The overall fit is plotted as thick dots.
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In the text

$\begin{figure} \par\rotatebox{-90}{\resizebox{!}{18.0cm}{\includegraphics[clip]{h4560f6.ps}}} \end{figure}$ Figure 6: Result of subtracting a $\lambda ^{-3.3}$ slope from the dereddened spectrum of V840 Oph. The identified emission lines and those absorption features that are also present in the 2002 data are marked.
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In the text

$\begin{figure} \par\resizebox{6cm}{!}{\includegraphics[clip]{h4560f1.ps}} \end{figure}$	Figure 1: The B-band finding chart shows the $1 \times 1$ arcmin surroundings of V840 Oph; north is up, east is left. The three possible candidates for the old nova are indicated by the numbers that have been assigned by Duerbeck (1987).
Open with DEXTER

$\begin{figure} \par\rotatebox{-90}{\resizebox{!}{18.1cm}{\includegraphics[clip]{h4560f2.ps}}} \end{figure}$	Figure 2: Colour-colour diagrams are plotted for the three nova candidates and the surrounding field stars. While candidates 2 and 3 lie close to the main sequence (defined by the majority of field stars), the best candidate (No. 1) clearly stands out in all three diagrams.
Open with DEXTER

$\begin{figure} { \rotatebox{-90}{\resizebox{!}{14cm}{\includegraphics[clip]{h4560f3.ps}}} }\end{figure}$	Figure 3: Spectrum of candidate No. 1. Its nova character is confirmed by the presence of typical nova emission lines. Noteworthy are the strong He II line at $\lambda = 541$ nm and the presence of the C IV doublet at $\lambda = 580/1$ nm (not resolved).
Open with DEXTER

$\begin{figure} { \rotatebox{-90}{\resizebox{!}{13cm}{\includegraphics[clip]{h4560f4.ps}}} }\end{figure}$	Figure 4: Flux calibrated spectrum of V840 Oph (candidate 1), obtained in February 2003. The spectra has not been corrected for reddening. Apart from the high excitation lines already seen in the 2002 spectrum, the strong emission feature between $\lambda = 460$ and 475 nm (Bowen blend and He II) attracts attention.
Open with DEXTER

$\begin{figure} \par\rotatebox{-90}{\resizebox{!}{8.8cm}{\includegraphics[clip]{h4560f5.ps}}} \end{figure}$	Figure 5: A detailed view on the Bowen blend and He II $\lambda$ 469. Over the original spectrum the fits to the five ions are plotted as dotted line for N III, dashed line for C III, dash-dot line for C IV, dash-dot-dot line for O II, and long dashes for He II. The overall fit is plotted as thick dots.
Open with DEXTER

$\begin{figure} \par\rotatebox{-90}{\resizebox{!}{18.0cm}{\includegraphics[clip]{h4560f6.ps}}} \end{figure}$	Figure 6: Result of subtracting a $\lambda ^{-3.3}$ slope from the dereddened spectrum of V840 Oph. The identified emission lines and those absorption features that are also present in the 2002 data are marked.
Open with DEXTER