@@ -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,
@@ -482,7 +482,7 @@ \section{Current Methods}
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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.
@@ -564,8 +564,8 @@ \chapter{Method}
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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.
@@ -969,7 +969,7 @@ \section{Deep Embedded Clustering (DEC)}
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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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