NÚMERO 27
VOLUMEN 4
DICIEMBRE 1965

THE CONTINUUM EMISSION OF THE ORION NEBULA
Manuel E. Méndez

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41


ON THE THERMAL RADIO EMISSION OF THE CYGNUS LOOP
Arcadio Poveda

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49


MULTICOLOR PHOTOMETRY OF TX CAMELOPARDALIS.
A HETZLER OBJECT
Eugenio E. Mendoza V.

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51


THE MOTION OF TWELVE LATE TYPE STARS
Peter van de Kamp and Eugenio E. Mendoza V.

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55


AN INVESTIGATION OF LATE TYPE STARS
Eugenio E. Mendoza V. and Harold. L. Johnson

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57


DESIGN OF TELESCOPES OF THE CASSEGRAIN AND
RITCHEY-CHRETIEN TYPES
Daniel Malacara

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64


RONCHI TEST AND TRANSVERSAL SPHERICAL ABERRATION
Daniel Malacara

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73


GW ORIONIS, A 20,000 YEARS OLD T TAURI STAR?
Arcadio Poveda

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77