Computer Science
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ummi.rept.....h&link_type=abstract
Final Technical Report Minnesota Univ., Minneapolis.
Computer Science
Andromeda Galaxy, Black Body Radiation, Spectral Energy Distribution, Stellar Luminosity, Variable Stars, Bolometers, Infrared Spectrophotometers, Iue, Stellar Evolution, Ultraviolet Spectroscopy
Scientific paper
Ultraviolet spectroscopy from the IUE, in combination with groundbased visual and infrared photometry, are to determine the energy distributions of the luminous blue variables, the Hubble-Sandage variables, in M31 and M33. The observed energy distributions, especially in the ultraviolet, show that these stars are suffering interstellar reddening. When corrected for interstellar extinction, the integrated energy distributions yield the total luminosities and black body temperatures of the stars. The resulting bolometric magnitudes and temperatures confirm that these peculiar stars are indeed very luminous, hot stars. They occupy the same regions of theB01 vs. log Te diagram as do eta Car, P Cyg and S Dor in our galaxy and the LMC. Many of the Hubble-Sandage variables have excess infrared radiation which is attributed to free-free emission from their extended atmospheres. Rough mass loss estimates from the infrared excess yield rates of 0.00001 Mannual/yr. The ultraviolet spectra of the H-S variables are also compared with similar spectra of eta Car, P Cyg and S For.
Benevenuti P.
Blaha Cynthia
Dodorico Sandro
Gull Ted R.
Humphreys Roberta M.
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