Ultraviolet Spectral Dating of Stars and Galaxies

Details Ultraviolet Spectral Dating of Stars and Galaxies Ultraviolet Spectral Dating of Stars and Galaxies

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...492l.131h&link_type=abstract

Astrophysical Journal Letters v.492, p.L131

Astronomy and Astrophysics

Astronomy

29

Galaxies: Evolution, Galaxies: Stellar Content, Ultraviolet: Galaxies, Ultraviolet: Stars, Stars: Atmospheres

Scientific paper

An echelle spectrogram (R = 30,000) of the 2300-3100 A region in the ultraviolet spectrum of the F8 V star 9 Comae is presented. The observation is used to calibrate features in the mid-ultraviolet spectra of similar stars according to age and metal content. In particular, the spectral break at 2640 A is interpreted using the spectral synthesis code SYNSPEC. We use this feature to estimate the time since the last major star formation episode in the early-type galaxy LBDS 53W091 at redshift z=1.55 , whose rest-frame mid-ultraviolet spectrum, observed with the Keck Telescope, is dominated by the flux from similar stars that are at or near the main-sequence turnoff in that system (Spinrad et al.). Our result, 1 Gyr if the flux-dominating stellar population has a metallicity twice solar, or 2 Gyr for a more plausible solar metallicity, is significantly lower than the previous estimate and thereby relaxes constraints on cosmological parameters that were implied by the earlier work.

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