# Water Vapor on Betelgeuse as Revealed by TEXES

@inproceedings{Ryde2005WaterVO,
title={Water Vapor on Betelgeuse as Revealed by TEXES},
author={N. Ryde and G. Harper and M. Richter and T. Greathouse and J. Lacy},
year={2005}
}
The outer atmosphere of the M supergiant Betelgeuse is puzzling. Published observations of different kinds have shed light on different aspects of the atmosphere, but no unified picture has emerged. They have shown, for example, evidence of a water envelope (MOLsphere) that in some studies is found to be optically thick in the mid-infrared. In this paper, we present high-resolution, mid-infrared spectra of Betelgeuse recorded with the TEXES spectrograph. The spectra clearly show absorption… Expand

#### Figures and Tables from this paper

Water vapor on supergiants : The 12 μm texes spectra of μ cephei
• Physics
• 2006
Several recent papers have argued for warm, semidetached, molecular layers surrounding red giant and supergiant stars, a concept known as a MOLsphere. Spectroscopic and interferometric analyses haveExpand
The molecular and dusty composition of Betelgeuse's inner circumstellar environment
Context. The study of the atmosphere of red supergiant stars in general and of Betelgeuse (α Orionis) in particular is of prime importance to understand dust formation and how mass is lost to theExpand
Systematic trend of water vapour absorption in red giant atmospheres revealed by high resolution TEXES 12 mu m spectra
Context. The structures of the outer atmospheres of red giants are very complex. Recent interpretations of a range of different observations have led to contradictory views of these regions. It isExpand
Infrared Spectra and Visibilities as Probes of the Outer Atmospheres of Red Supergiant Stars
In the light of the recent results of the stellar interferometry, we examine the nature of the extra molecular layer outside the photosphere of red supergiant stars, so far studied mostly with theExpand
THE NON-UNIFORM, DYNAMIC ATMOSPHERE OF BETELGEUSE OBSERVED AT MID-INFRARED WAVELENGTHS
We present an interferometric study of the continuum surface of the red supergiant star Betelgeuse at 11.15 μm wavelength, using data obtained with the Berkeley Infrared Spatial Interferometer eachExpand
Spatially resolving the inhomogeneous structure of the dynamical atmosphere of Betelgeuse with VLTI/AMBER
Context. Aims. We present spatially resolved high-spectral resolution K-band observations of the red supergiant Betelgeuse (α Ori) using AMBER at the Very Large Telescope Interferometer (VLTI). OurExpand
The Effective Temperatures and Physical Properties of Magellanic Cloud Red Supergiants: The Effects of Metallicity
• Physics
• 2006
We present moderate-resolution spectrophotometry of 36 red supergiants (RSGs) in the LMC and 37 RSGs in the SMC. Using the MARCS atmosphere models to fit this spectrophotometry, we determine theExpand
NLTE water lines in Betelgeuse-like atmospheres
• Physics
• 2013
The interpretation of water lines in red supergiant stellar atmospheres has been much debated over the past decade. The introduction of the so-called MOLspheres to account for near-infrared “extra”Expand
Evolved stars with complex atmospheres - the high spectral resolution, mid-IR view
The physical structures of the outer atmospheres of red giants are not known. They are certainly complex and a range of recent observations are showing that we need to embrace to non-classicalExpand
Evolutionary tracks for Betelgeuse
• Physics
• 2008
We have constructed a series of non-rotating quasi-hydrostatic evolutionary models for the M2 Iab supergiant Betelgeuse ($\alpha~Orionis$). Our models are constrained by multiple observed values forExpand

#### References

SHOWING 1-10 OF 78 REFERENCES
Detection of Water Vapor in the Photosphere of Arcturus
• Physics
• 2002
We report detections of pure rotation lines of OH and H2O in the K1.5 III red-giant star Arcturus (α Bootis) using high-resolution, infrared spectra covering the regions 806 −822cm −1 (12.2 −12.4 µm)Expand
Large convection cells as the source of Betelgeuse's extended atmosphere
• Physics
• Nature
• 1998
Supergiant stars such as Betelgeuse have very extended atmospheres, the properties of which are poorly understood. Alfvén waves, acoustic waves,, and radial pulsations have all been suggested asExpand
A Spatially Resolved, Semiempirical Model for the Extended Atmosphere of α Orionis (M2 Iab)
• Physics
• 2001
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
Betelgeuse and Its Variations
Observations of Betelgeuse show that (1) the photospheric spectral lines are very broad with a 1/e width of 11 km s-1, but they have stable shapes with time as the star varies in other ways; (2) allExpand
Betelgeuse: Giant Convection Cells
ABSTRACT Spectroscopic observations of the M supergiant star Betelgeuse were taken at the Elginfield Observatory over 17 months in the 1999–2000 observing seasons in order to search for giantExpand
Warm water vapor envelope in Mira variables and its effects on the apparent size from the near-infrared to the mid-infrared
We present a possible interpretation for the increase of the angular diameter of the Mira variables o Cet, R Leo, and χ Cyg from the K band to the 11 µm region revealed by the recent interferometricExpand
Water in K and M giant stars unveiled by ISO
Based on the spectra obtained with Infrared Space Observatory, ISO, we detected the 6.3m bands of water in the late K giant Aldebaran ( Tau) and several early M giant stars (between M0 and M3.5),Expand
Unveiling Mira stars behind the molecules - Confirmation of the molecular layer model with narrow band near-infrared interferometry
We have observed Mira stars with the FLUOR beamcombiner on the IOTA interferometer in narrow bands around $2.2\,\mu$m wavelength. We find systematically larger diameters in bands contaminated byExpand
Water on the Early M Supergiant Stars α Orionis and μ Cephei
We reanalyze the spectra of α Ori (M2 Iab) and μ Cep (M2 Ia) observed with the balloon-borne telescope Stratoscope II more than 35 years ago, and we confirm the presence of water in these early MExpand
New views of Betelgeuse: multi‐wavelength surface imaging and implications for models of hotspot generation
ABSTRA C T We report contemporaneous multi-wavelength interferometric imaging of the red supergiant star Betelgeuse (a Orionis), using the Cambridge Optical Aperture Synthesis Telescope (COAST) andExpand