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Diffracto-Astrometry with Hubble Space Telescope and Adaptive Optics Images

Sánchez, L. J.; Ruelas-Mayorga, A.; Allen, C. +1 more

Following the lead established by Allen et al. (1974, 2004) in the study of internal movements in Trapezium-type systems, we decided to investigate the possibility of performing precision astrometry on Hubble Space Telescope (HST) images and on images obtained with Adaptive Optics (AO) systems. A region widely observed by the HST is that of the Or…

Classifying the stellar environment around V838 Monocerotis

Schaefer, G. H.; Rosero-Rueda, V. A.; Bond, H. E. +2 more

The V838 Mon's behavior and the nature of the progenitor object are not well understood. Type B stars recently have been found in the vicinity of V838 Mon and it is thought that they may be part of a young open cluster. Since the cluster is in a spiral arm of the Galaxy, the identification of additional member stars is complicated; therefore, phot…