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A NEW VLA-HIPPARCOS DISTANCE TO BETELGEUSE AND ITS IMPLICATIONS
The distance to the M supergiant Betelgeuse is poorly known, with the Hipparcos parallax having a significant uncertainty. For detailed numerical studies of M supergiant atmospheres and winds,Expand
A Spatially Resolved, Semiempirical Model for the Extended Atmosphere of α Orionis (M2 Iab)
We have constructed a detailed mean density and temperature model for the extended outer atmosphere of the O-rich supergiant Betelgeuse (??Ori [M2 Iab]), which extends from 1.0 to 10.0 stellar radii.Expand
Texes Observations of M Supergiants: Dynamics and Thermodynamics of Wind Acceleration
We have detected [Fe II] 17.94 μm and 24.52 μm emission from a sample of M supergiants (μ Cep, α Sco, α Ori, CE Tau, AD Per, and α Her) using the Texas Echelon Cross Echelle Spectrograph on NASA'sExpand
The Environment of the Optically Brightest Herbig Ae Star, HD 104237
We investigate the environment of the nearest Herbig Ae star, HD 104237, with a multiwavelength combination of optical coronagraphic, near-IR, and mid-IR imaging supported by optical, UV, andExpand
Lines of Oiv and Siv in the Goddard High-Resolution Spectrograph spectrum of RR Tel: constraints on atomic data
High signal-to-noise ratio spectra of RR Tel obtained at medium resolution with the Goddard High-Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) are used to test available atomicExpand
FAR-ULTRAVIOLET EMISSIONS OF THE SUN IN TIME: PROBING SOLAR MAGNETIC ACTIVITY AND EFFECTS ON EVOLUTION OF PALEOPLANETARY ATMOSPHERES
We present and analyze Far Ultraviolet Spectroscopic Explorer (FUSE) observations of six solar analogs. These are single main-sequence G0-G5 stars selected as proxies for the Sun at several stages ofExpand
ALMA sub-mm maser and dust distribution of VY Canis Majoris
Aims. Cool, evolved stars have copious, enriched winds. Observations have so far not fully constrained models for the shaping and acceleration of these winds. We need to understand the dynamicsExpand
Chemical evolution of fluorine in the bulge , High-resolution K-band spectra of giants in three fields
Context. Possible main formation sites of fluorine in the Universe include asymptotic giant branch (AGB) stars, the v-process in Type II supernova, and/or Wolf-Rayet stars. The importance of theExpand
Mg I emission lines at 12 and 18 mu m in K giants
Context. The solar mid-infrared metallic emission lines have already been observed and analyzed well, and the formation scenario of the Mg I 12 mu m lines has been known for more than a decade.Expand
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