The M Supergiant Betelgeuse (alpha Orionis: M2 Iab)

1-D Spatially Resolved Semiempirical Model

Temperature and Density Model

• Source: Harper, Brown \& Lim (2001 ApJ 551, 1073)
• VLA centimeter radio interferometry
• First based on data obtained by Lim et al. (1998 Nature 392, 575)
• Funded by NASA Long Term Space Astrophysics Program
  A Unified Analysis of Non-Radiaitve Heating and Wind Acceleration in Late-Type Stellar Atmospheres

2-D Axisymmetric Spatially Resolved Semiempirical Model

Temperature and Density Model

• Source: Harper & Brown
• Based on
  • VLA A-config.+ Pie Town multiwavelength cm-radio
  • HST/STIS spatially resolved spectra (electron density)
  • HST/GHRS UV spectra (1175-3000 Angstrom - photoionization)
  • FUSE FUV spectra (912-1185 Angstrom - photoionization)
  • COBE/DIRBE IR photometry (1.25-240 microns)
  • ISO IR flux distribution (2.4-44 micron)
  • WUPPE UV spectropolarimetry (1500-3000 Angstroms)
• Funded by NASA Astrophysics Data Program:
  Probing Betelgeuses's Inhomogeneous Atmosphere (NNG04GD33G)