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On the Spectrophotometry Identification of Late type Binaries in Open Clusters

  • C. Bettis (a1) and D. Branch (a1)

Abstract

Using both measured values and model atmospheres, the equivalent widths of the Na D lines of hypothetical late type main sequence binaries are calculated. Enhancements in the D lines of 90% over the value for a single star whose B — V color is the same as the composite B — V are possible. It is suggested that this effect may be used to identify binaries in galactic clusters, in particular those binaries whose components differ by more than 3 mag in brightness.

Resumen

Usando tanto los valores medidos como modelos atmosféricos, se han calculado los anchos equivalentes de las lineas D del Na para estrellas binarias hipotéticas de tipo tardío de la secuencia principal. Es posible un aumento en el brillo de las líneas D de un 90% sobre el valor para una estrella sola, cuyo color B — V es el mismo que del par combinado. Se sugiere que este efecto puede usarse para identificar binarias en cúmulos galácticos, en particular para aquellas binarias cuyas componentes difieren en brillo por más de 3 mag.

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Copyright

References

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On the Spectrophotometry Identification of Late type Binaries in Open Clusters

  • C. Bettis (a1) and D. Branch (a1)

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