A revisit to the regions of some van den Bergh open clusters using photometric and astrometric parameters

We present results of a study that combines photometry and astrometry for the open clusters vdB80, vdB85 and vdB130. We apply a model which analyses the proper motion distribution and the stellar density to find the kinematic parameters and stellar membership in the region of the mentioned open clus...

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Detalles Bibliográficos
Autores: Orellana, Rosa Beatriz, De Biasi, María Silvina, Paíz, Leonardo Gastón, Bustos Fierro, I. H., Calderón, J. H.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2015
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/104902
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/104902
Access Level:acceso abierto
Palabra clave:Astronomía
(Galaxy:) open clusters and associations: general
(Galaxy:) open clusters and associations: individual (vdB80, vdB85, vdB130)
Astrometry
Descripción
Sumario:We present results of a study that combines photometry and astrometry for the open clusters vdB80, vdB85 and vdB130. We apply a model which analyses the proper motion distribution and the stellar density to find the kinematic parameters and stellar membership in the region of the mentioned open clusters. The astrometric data are obtained from UCAC4 catalogue. For each cluster, we report the centre coordinates, the components of mean proper motion, the angular diameter and the astrometric members. They are: <math><mrow is="true"><mi is="true">α</mi><mo is="true">=</mo><mn is="true">97</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">73938</mn><mo is="true">±</mo><mn is="true">0</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">00846</mn><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><mi is="true">δ</mi><mo is="true">=</mo><mo is="true">-</mo><mn is="true">9</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">66953</mn><mo is="true">±</mo><mn is="true">0</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">01177</mn><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msub is="true"><mrow is="true"><mi is="true">μ</mi></mrow><mrow is="true"><mi is="true">α</mi></mrow></msub><mi mathvariant="italic" is="true">cos</mi><mi is="true">δ</mi><mo is="true">=</mo><mo is="true">-</mo><mn is="true">2.13</mn><mo is="true">±</mo><mn is="true">0.47</mn><mspace width="0.25em" is="true"></mspace><mi mathvariant="normal" is="true">mas</mi><mo is="true">/</mo><mi mathvariant="normal" is="true">yr</mi><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msub is="true"><mrow is="true"><mi is="true">μ</mi></mrow><mrow is="true"><mi is="true">δ</mi></mrow></msub><mo is="true">=</mo><mo is="true">-</mo><mn is="true">0.95</mn><mo is="true">±</mo><mn is="true">0.47</mn><mspace width="0.25em" is="true"></mspace><mi mathvariant="normal" is="true">mas</mi><mo is="true">/</mo><mi mathvariant="normal" is="true">yr</mi><mtext is="true">,</mtext><msup is="true"><mrow is="true"><mn is="true">12</mn></mrow><mrow is="true"><mo is="true">′</mo></mrow></msup></mrow></math> , 15 members; vdB85: <math><mrow is="true"><mi is="true">α</mi><mo is="true">=</mo><mn is="true">101</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">71670</mn><mo is="true">±</mo><mn is="true">0</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">00808</mn><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><mi is="true">δ</mi><mo is="true">=</mo><mn is="true">1</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">34392</mn><mo is="true">±</mo><mn is="true">0</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">01253</mn><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msub is="true"><mrow is="true"><mi is="true">μ</mi></mrow><mrow is="true"><mi is="true">α</mi></mrow></msub><mi mathvariant="italic" is="true">cos</mi><mi is="true">δ</mi><mo is="true">=</mo><mn is="true">0.89</mn><mo is="true">±</mo><mn is="true">0.43</mn><mspace width="0.25em" is="true"></mspace><mi mathvariant="normal" is="true">mas</mi><mo is="true">/</mo><mi mathvariant="normal" is="true">yr</mi><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msub is="true"><mrow is="true"><mi is="true">μ</mi></mrow><mrow is="true"><mi is="true">δ</mi></mrow></msub><mo is="true">=</mo><mn is="true">3.24</mn><mo is="true">±</mo><mn is="true">0.43</mn><mspace width="0.25em" is="true"></mspace><mi mathvariant="normal" is="true">mas</mi><mo is="true">/</mo><mi mathvariant="normal" is="true">yr</mi><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msup is="true"><mrow is="true"><mn is="true">8</mn></mrow><mrow is="true"><mo is="true">′</mo></mrow></msup></mrow></math> members; vdB130: <math><mrow is="true"><mi is="true">α</mi><mo is="true">=</mo><mn is="true">304</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">44001</mn><mo is="true">±</mo><mn is="true">0</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">01407</mn><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><mi is="true">δ</mi><mo is="true">=</mo><mn is="true">39</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">32745</mn><mo is="true">±</mo><mn is="true">0</mn><mi is="true">°</mi><mo is="true">.</mo><mn is="true">00726</mn><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msub is="true"><mrow is="true"><mi is="true">μ</mi></mrow><mrow is="true"><mi is="true">α</mi></mrow></msub><mi mathvariant="italic" is="true">cos</mi><mi is="true">δ</mi><mo is="true">=</mo><mo is="true">-</mo><mn is="true">4.14</mn><mo is="true">±</mo><mn is="true">0.25</mn><mspace width="0.25em" is="true"></mspace><mi mathvariant="normal" is="true">mas</mi><mo is="true">/</mo><mi mathvariant="normal" is="true">yr</mi><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msub is="true"><mrow is="true"><mi is="true">μ</mi></mrow><mrow is="true"><mi is="true">δ</mi></mrow></msub><mo is="true">=</mo><mo is="true">-</mo><mn is="true">5.15</mn><mo is="true">±</mo><mn is="true">0.25</mn><mspace width="0.25em" is="true"></mspace><mi mathvariant="normal" is="true">mas</mi><mo is="true">/</mo><mi mathvariant="normal" is="true">yr</mi><mtext is="true">,</mtext><mspace width="0.35em" is="true"></mspace><msup is="true"><mrow is="true"><mn is="true">9</mn></mrow><mrow is="true"><mo is="true">′</mo></mrow></msup></mrow></math> 9 members. We analyse the incidence of the proper motion errors in the determination of the cluster parameters and of the stellar membership and find that they are not significantly changed. We finally compare the astrometric members with the photometric ones given in the literature.

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