Studies on a Star Clusters: The Open Cluster T9

Details Studies on a Star Clusters: The Open Cluster T9 Studies on a Star Clusters: The Open Cluster T9

Nov 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970bott....5..293p&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 5, pp. 293-296 (1970) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

3

Galaxy: Open Clusters And Associations: Individual (T9)

Scientific paper

Photographic photometry in UBV, calibrated with standards determined photoelectrically, is performed on stars in the region of the open cluster T9. The color-magnitude and color-color diagrams are presented. The latter diagram shows that the interstellar reddening of the cluster stars is not larger than 0.2 magnitudes; thus the visual total absorption is around 0.6 magnitudes. The earliest spectral type is AO. The spectral data obtained of the three brightest stars have yielded a distance of 900 parsecs for the cluster. Furthermore the starcounts of the region have shown that the cluster has a diameter of 7'.2 corresponding to a linear diameter of 1.8 pc. The total membership is found to be 63 stars to a limiting magnitude V = 16.5.

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