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paper/paper.tex

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@@ -305,7 +305,7 @@ \subsection{Deep Open Clustering of stars}
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As it was described in Section~\ref{sec:feature_selection}, the number of features we
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deal is not too large. This latent space helps us to start in a reduced number of
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features and avoids the \emph{``curse of dimensionality``}~\cite{bellman1961curse}.
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features and avoids the \emph{``curse of dimensionality''}~\cite{bellman1961curse}.
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The autoencoder is pretrained before fitting the model to generate predictions. Then,
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the encoder layers of the autoencoder are used with the aim of transforming input data to

thesis/thesis.tex

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@@ -219,7 +219,7 @@ \chapter{Introduction}
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as shown in Figure~\ref{fig:pos_ngc_2682},
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these coordinates are not useful to separate those stars that belong to the cluster from the other that do not.
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However, if we look for overdensities in the proper motion configuration spaces, it is possible, at least at first instance,
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to assume a possible membership cut (see Figure~\ref{fig:pm_ngc_2682}.
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to assume a possible membership cut (see Figure~\ref{fig:pm_ngc_2682}).
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\begin{figure}[htbp]
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\centering
@@ -444,21 +444,21 @@ \section{Current Methods}
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\begin{displayquote}
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The non-field population does not occupy the entire workspace, but is spatially concentrated,
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which makes it possible to distinguish two regions in the workspace:
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the only field region (label `f`), dominated by star fields,
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and the cluster + field region (label `c+f`), which includes both star fields and not star
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the only field region (label `f'), dominated by star fields,
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and the cluster + field region (label `c+f'), which includes both star fields and not star
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fields~\cite{balaguer2020clusterix}.
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\end{displayquote}
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This fact implies defining three areas or regions with different radius.
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The first `c+f` corresponds to the one in which the cluster members are
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The first `c+f' corresponds to the one in which the cluster members are
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presumed to be contained together with other star fields that are not part of the cluster.
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The second region is the broadest and assumes that it only contains stars
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in an extended visual field without components of the cluster.
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The third region is the intermediate one and is out of analysis (void area),
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since it would correspond to a possible transition zone between the other two.
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The right choice of these radii, even having a previous estimation for the `c+f` region,
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highly affects the execution of the algorithm and, in general, requires a considerable wide field `f`.
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The right choice of these radii, even having a previous estimation for the `c+f' region,
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highly affects the execution of the algorithm and, in general, requires a considerable wide field `f'.
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There is no rule of thumb that defines relative proportions of these areas.
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Finally, when an acceptable result is obtained,
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and a later identification of OCs using photometric information, also from Gaia DR2.
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The method includes two phases: the first one uses an unsupervised clustering algorithm, DBSCAN,
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to search for overdensities \((l, b \pi, \mu_{\alpha} *, \mu_{\delta})\),
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to search for overdensities \((l, b, \pi, \mu_{\alpha} *, \mu_{\delta})\),
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and then applies a deep learning Artificial Neural Network (ANN),
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previously trained with magnitude diagrams,
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to identify isochrone patterns within the detected overdensities and thus proceed to confirm them as OC.
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Figure~\ref{fig:raw_pm_melotte_22} shows \emph{proper motion in right ascension and declination}
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for a sample of the downloaded dataset for Melotte 22.
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At first sight, two main clusters can be distinguished, one of them centered nearly at (0, 0)
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and the second one with center at (20, -45). This second cluster is the one we are looking for.
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At first sight, two main clusters can be distinguished, one of them centered nearly at [0, 0]
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and the second one with center at [20, -45]. This second cluster is the one we are looking for.
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However, although the second cluster is almost isolated, there are stars that do not belong to the OC.
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Thus, we need more information to properly characterize the open cluster.
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Although, as explained in Section~\ref{sec:feature_selection},
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the number of features we are managing is not too large,
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this latent space helps us reduce the number of features
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and avoids the \emph{``curse of dimensionality``}~\cite{bellman1961curse}.
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and avoids the \emph{``curse of dimensionality''}~\cite{bellman1961curse}.
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The autoencoder is pretrained before fitting the model to generate predictions. Then,
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the encoder layers of the autoencoder are used with the aim of transforming input data to

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