The hot stellar component in elliptical galaxies and spiral bulges. I - The far-ultraviolet spectrum of the bulge of M31

Details The hot stellar component in elliptical galaxies and spiral bulges. I - The far-ultraviolet spectrum of the bulge of M31 The hot stellar component in elliptical galaxies and spiral bulges. I - The far-ultraviolet spectrum of the bulge of M31

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408...92f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 408, no. 1, p. 92-107.

Astronomy and Astrophysics

Astronomy

77

Elliptical Galaxies, Far Ultraviolet Radiation, Galactic Bulge, Galactic Radiation, Hot Stars, Spiral Galaxies, Ultraviolet Astronomy, Absorption Spectra, Asymptotic Giant Branch Stars, Planetary Nebulae, Spectral Energy Distribution, Ultraviolet Spectra

Scientific paper

An analysis of the M31 spectrum is presented and compared to the spectrum of NGC 1399. There are significant differences between the two spectra that cannot easily be explained by uncertainties in extinction. The M31 spectrum requires a contribution from stars hotter than those that dominate the NGC 1399 spectral energy distribution. It is found that an acceptable fit to the M31 spectrum can be produced by assuming that it consists of stars like those in NGC 1399, combined with a much higher proportion of classical post-asymptotic giant branch stars. This result is not completely conclusive because of uncertainties in extinction, but it agrees with the idea that as metallicity increases, so does the contribution from extreme horizontal branch stars, post-early-AGB stars, and AGB-Manque stars.

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