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An obscured cluster associated with the HII region RCW173
Amparo Marco, Ignacio Negueruela
The discovery of several clusters of red supergiants towards l=24-30 deg has triggered interest in this area of the Galactic plane, where lines of sight are very complex and previo…
Red supergiants around the obscured open cluster Stephenson 2
Ignacio Negueruela, Amparo Marco, Carlos González-Fernández +4
Several clusters of red supergiants have been discovered in a small region of the Milky Way close to the base of the Scutum-Crux Arm and the tip of the Long Bar. Population synthes…
Fast X-ray transients in the Galactic bulge with the Rossi X-ray Timing Explorer
David M. Smith, Craig B. Markwardt, Jean H. Swank +1
In X-ray binaries, rapid variability in X-ray flux of greater than an order of magnitude on time-scales of a day or less appears to be a signature of wind accretion from a supergia…
On the nature of candidate luminous blue variables in M33
J. S. Clark, N. Castro, M. Garcia +5
Luminous blue variables (LBVs) are expected to play an important role in massive stellar evolution as well as being the progenitors of some of the most luminous supernovae known. I…
On the nature of the galactic early-B hypergiants
J. S. Clark, F. Najarro, I. Negueruela +3
Despite their importance to a number of astrophysical fields, the lifecycles of very massive stars are still poorly defined. In order to address this shortcoming, we present a deta…
A third cluster of red supergiants in the vicinity of the massive cluster RSGC3
C. González-Fernández, I. Negueruela
Recent studies have shown that the area around the massive, obscured cluster RSGC3 may harbour several clusters of red supergiants. In this paper, we analyse a clump of photometric…
On the binary nature of the gamma-ray sources AGL J2241+4454 (=MWC 656) and HESS J0632+057 (=MWC 148)
J. Casares, M. Ribo, I. Ribas +3
We present optical spectroscopy of MWC 656 and MWC 148, the proposed optical counterparts of the gamma-ray sources AGL J2241+4454 and HESS J0632+0 57, respectively. The main parame…