Search Publications
First detection of a THz water maser in NGC 7538-IRS1 with SOFIA and new 22 GHz e-MERLIN maps
Menten, K. M.; Schneider, N.; Bontemps, S. +7 more
Context. The formation of massive stars (M> 10M⊙, L > 103L⊙) is still not well understood. Accumulating a large amount of mass infalling within a single entity in spite of radiation pressure is possible if, in addition to several other conditions, enough thermal energy is released. Despite numerous water line…
Evolutionary status of the Of?p star HD 148937 and of its surrounding nebula NGC 6164/5
Lebouteiller, V.; Nazé, Y.; Mahy, L. +3 more
Aims: The magnetic star HD 148937 is the only Galactic Of?p star surrounded by a nebula. The structure of this nebula is particularly complex and is composed, from the center out outwards, of a close bipolar ejecta nebula (NGC 6164/5), an ellipsoidal wind-blown shell, and a spherically symmetric Strömgren sphere. The exact formation process o…
The supersoft X-ray source in V5116 Sagittarii . I. The high resolution spectra
Greiner, J.; Hernanz, M.; Sala, G. +1 more
Context. Classical nova explosions occur on the surface of an accreting white dwarf in a binary system. After ejection of a fraction of the envelope and when the expanding shell becomes optically thin to X-rays, a bright source of supersoft X-rays arises, powered by residual H burning on the surface of the white dwarf. While the general picture of…
B stars seen at high resolution by XMM-Newton
Nazé, Yaël; Cazorla, Constantin
We report on the properties of 11 early B stars observed with gratings on board XMM-Newton and Chandra, thereby doubling the number of B stars analysed at high resolution. The spectra typically appear soft, with temperatures of 0.2-0.6 keV, and moderately bright (log [LX/LBOL] -7) with lower values for later type stars. In li…
A Jupiter-mass planet around the K0 giant HD 208897
Yılmaz, M.; Sato, B.; Bikmaev, I. +9 more
For over 10 years, we have carried out a precise radial velocity (RV) survey to find substellar companions around evolved G, K-type stars to extend our knowledge of planet formation and evolution. We performed high precision RV measurements for the giant star
Just how hot are the ω Centauri extreme horizontal branch pulsators?
Ely, J.; Latour, M.; Chayer, P. +5 more
Context. Past studies based on optical spectroscopy suggest that the five
The shocked gas of the BHR71 outflow observed by Herschel: indirect evidence for an atomic jet
Podio, L.; Codella, C.; Ceccarelli, C. +7 more
Context. In the BHR71 region, two low-mass protostars IRS1 and IRS2 drive two distinguishable outflows. They constitute an ideal laboratory to investigate both the effects of shock chemistry and the mechanisms that led to their formation.
Aims: We aim to define the global morphology of the warm gas component of the BHR71 outflow and at modell…
The Phoenix galaxy as seen by NuSTAR
Harrison, F. A.; Stern, D.; Zhang, W. W. +18 more
Aims: We study the long-term variability of the well-known Seyfert 2 galaxy Mrk 1210 (also known as UGC 4203, or the Phoenix galaxy).
Methods: The source was observed by many X-ray facilities in the last 20 yr. Here we present a NuSTAR observation and put the results in the context of previously published observations.
Results: NuST…
Chandra imaging of the kpc extended outflow in 1H 0419-577
Kaastra, J. S.; Costantini, E.; Mehdipour, M. +3 more
The Seyfert 1 galaxy 1H 0419-577 hosts a kpc extended outflow that is evident in the [O III] image and that is also detected as a warm absorber in the UV/X-ray spectrum. Here, we analyze a 30 ks Chandra-ACIS X-ray image, with the aim of resolving the diffuse extranuclear X-ray emission and of investigating its relationship with the galactic outflo…
New eruptive variable in the massive star-forming region associated with IRAS 18507+0121
Nikoghosyan, E. H.; Azatyan, N. M.; Khachatryan, K. G.
Aims: We report the discovery of a strong outburst of the embedded young stellar object (YSO) UKIDSS-J185318.36+012454.5, located in the star-forming region associated with IRAS 18507+0121 and the ultra-compact H II region GAL 034.4+00.23.
Methods: Using archival photometric data and images, we determined the amplitude and the epoch of t…