4 papers · 1 filter
The open cluster Pismis 11 and the very luminous blue supergiant HD 80077
Amparo Marco, Ignacio Negueruela
(Abridged) The very luminous blue supergiant HD 80077 has been claimed to be a member of the young open cluster Pismis 11, and hence a hypergiant. We obtained UBVRI photometry of t…
Blue Stragglers, Be stars and X-ray binaries in open clusters
Amparo Marco, Ignacio Negueruela, Christian Motch
Combination of high-precision photometry and spectroscopy allows the detailed study of the upper main sequence in open clusters. We are carrying out a comprehensive study of a numb…
Stellar tracers of the Cygnus Arm I. Spectroscopic study of bright photometric candidates
Ignacio Negueruela, Amparo Marco
We present medium-resolution spectroscopy of a sample of stars in the second Galactic quadrant selected from the literature because their colours suggest that they are moderately-r…
The Be/X-ray transient KS 1947+300
Ignacio Negueruela, GianLuca Israel, Amparo Marco +2
We present optical spectroscopy and optical and infrared photometry of the counterpart to the transient X-ray source KS 1947+300. The counterpart is shown to be a moderately redden…