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astro-ph2004
CCD uvby-beta photometry of the young open cluster NGC 663
J. Fabregat, G. Capilla
NGC 663 is a young, moderately rich open cluster, known to contain one of the largest fractions of Be stars among all galactic clusters. In this work we present CCD uvby-beta photo…
astro-ph2004
Discovery of the optical counterpart to the X-ray pulsar SAX J2103.5+4545
P. Reig, I. Negueruela, J. Fabregat +3
We report optical and infrared photometric and spectroscopic observations that identify the counterpart to the 358.6-s X-ray transient pulsar SAX J2103.5+4545 with a moderately red…