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Intermediate to low-mass stellar content of Westerlund 1
Wolfgang Brandner, J. Simon Clark, Andrea Stolte +3
We have analysed near-infrared NTT/SofI observations of the starburst cluster Westerlund 1, which is among the most massive young clusters in the Milky Way. A comparison of colour-…
The XMM-Newton Serendipitous Survey V. Optical identification of the XMM-Newton Medium sensitivity Survey (XMS)
X. Barcons, F. J. Carrera, M. T. Ceballos +53
We present the XMM-Newton Medium sensitivity Survey (XMS), including a total of 318 X-ray sources found among the serendipitous content of 25 XMM-Newton target fields. The XMS comp…
Towards an understanding of the Of?p star HD 191612: optical spectroscopy
Ian D. Howarth, Nolan R. Walborn, Danny J. Lennon +17
We present extensive optical spectroscopy of the early-type magnetic star HD 191612 (O6.5f?pe-O8fp). The Balmer and HeI lines show strongly variable emission which is highly reprod…
Supergiant Fast X-ray Transients: A common behaviour or a class of objects?
Ignacio Negueruela, David M. Smith, Jose Miguel Torrejon +1
INTEGRAL monitoring of the Galactic Plane is revealing a growing number of recurrent X-ray transients, characterised by short outbursts with very fast rise times (~ tens of minutes…
Pre-main-sequence stars in the young open cluster NGC 1893: II. Evidence for triggered massive star formation
Ignacio Negueruela, Amparo Marco, GianLuca Israel +1
(Abridged) The open cluster NGC 1893, illuminating the HII region IC410, contains a moderately large population of O-type stars and is one of the youngest clusters observable in th…
Exploring the connection between the stellar wind and the non-thermal emission in LS 5039
V. Bosch-Ramon, C. Motch, M. Ribo +5
LS 5039 has been observed with several X-ray instruments so far. The source presents X-ray variability at orbital timescales in flux and photon index. The system harbors an O-type…
On the X-ray and optical properties of the Be star HD 110432: a very hard-thermal X-ray emitter
Raimundo Lopes de Oliveira, Christian Motch, Myron A. Smith +3
(ABRIDGED) - HD 110432 is the first proposed, and best studied, member of a growing group of Be stars with X-ray properties similar to gamma Cas. These stars exhibit hard-thermal X…