Astrofísicas: Materia circunestelar

  • Publicación
    IRAS 17423-1755 (Hen 3-1475) Revisited: An O-rich High-mass Post-asymptotic Giant Branch Star
    The high-resolution (R ~ 600) Spitzer/IRS spectrum of the bipolar protoplanetary nebula (PN) IRAS 17423-1755 is presented in order to clarify the dominant...
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    JWST observations of the Ring Nebula (NGC 6720): I. Imaging of the rings, globules, and arcs
    We present JWST images of the well-known planetary nebula NGC 6720 (the Ring Nebula), covering wavelengths from 1.6 to 25 $\, \mu$m. The bright shell is...
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    Lessons from the ionised and molecular mass of post-CE PNe
    Close binary evolution is widely invoked to explain the formation of axisymmetric planetary nebulae, after a brief common envelope phase. The evolution of the...
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    Lithium and Hα in stars and brown dwarfs of sigma Orionis.
    We present intermediate- and low-resolution optical spectra around Hα and Li I lambda 6708 Åfor a sample of 25 low mass stars and 2 brown dwarfs with confirmed...
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    Long-term optical/infrared variability in the quiescent X-ray transient V404 Cyg
    We present the results of optical and infrared photometry of the quiescent X-ray transient V404 Cyg during the period 1992-2003. The ellipsoidal modulations...
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    M 2-9: moving dust in a fast bipolar outflow.
    Using optical images and spectra of the bipolar nebula M 2-9 we show that, in addition to the well-known bright inner nebula, the object has fast, highly...
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    Magnetospheric accretion onto the T Tauri star AA Tauri. I. Constraints from multisite spectrophotometric monitoring
    We have monitored the photometric, spectroscopic and polarimetric variations of the classical T Tauri star (CTTS) AA Tau over a period of a month. The light...
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    Mass loss from an extreme OH/IR star: OH 26.5+0.6
    Observations of H2O isotopologues of the extreme OH/IR star OH 26.5+0.6 show that the star has an initial mass consistent with it being an intermediate-mass...
  • Publicación
    Mid-infrared Spectral Variability Atlas of Young Stellar Objects
    Optical and near-infrared variability is a well-known property of young stellar objects. However, a growing number of recent studies claim that a considerable...