Ultraviolet spectral dating of stars and galaxies

S. R. Heap, T. M. Brown, Ivan - Hubeny, W. Landsman, S. Yi, M. Fanelli, J. P. Gardner, T. Lanz, S. P. Maran, A. Sweigart, M. E. Kaiser, J. Linsky, J. G. Timothy, D. Lindler, T. Beck, R. C. Bohlin, M. Clampin, J. Grady, J. Loiacono, C. Krebs

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

An echelle spectrogram (R = 30,000) of the 2300-3100 Å 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 Å 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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume492
Issue number2 PART II
StatePublished - 1998
Externally publishedYes

Fingerprint

ultraviolet spectra
dating
galaxies
stars
metallicity
spectrograms
estimates
star formation
telescopes
metal
synthesis
metals

Keywords

  • Galaxies: evolution
  • Galaxies: stellar content
  • Stars: atmospheres
  • Ultraviolet: galaxies
  • Ultraviolet: stars

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Heap, S. R., Brown, T. M., Hubeny, I. ., Landsman, W., Yi, S., Fanelli, M., ... Krebs, C. (1998). Ultraviolet spectral dating of stars and galaxies. Astrophysical Journal, 492(2 PART II).

Ultraviolet spectral dating of stars and galaxies. / Heap, S. R.; Brown, T. M.; Hubeny, Ivan -; Landsman, W.; Yi, S.; Fanelli, M.; Gardner, J. P.; Lanz, T.; Maran, S. P.; Sweigart, A.; Kaiser, M. E.; Linsky, J.; Timothy, J. G.; Lindler, D.; Beck, T.; Bohlin, R. C.; Clampin, M.; Grady, J.; Loiacono, J.; Krebs, C.

In: Astrophysical Journal, Vol. 492, No. 2 PART II, 1998.

Research output: Contribution to journalArticle

Heap, SR, Brown, TM, Hubeny, I, Landsman, W, Yi, S, Fanelli, M, Gardner, JP, Lanz, T, Maran, SP, Sweigart, A, Kaiser, ME, Linsky, J, Timothy, JG, Lindler, D, Beck, T, Bohlin, RC, Clampin, M, Grady, J, Loiacono, J & Krebs, C 1998, 'Ultraviolet spectral dating of stars and galaxies', Astrophysical Journal, vol. 492, no. 2 PART II.
Heap SR, Brown TM, Hubeny I, Landsman W, Yi S, Fanelli M et al. Ultraviolet spectral dating of stars and galaxies. Astrophysical Journal. 1998;492(2 PART II).
Heap, S. R. ; Brown, T. M. ; Hubeny, Ivan - ; Landsman, W. ; Yi, S. ; Fanelli, M. ; Gardner, J. P. ; Lanz, T. ; Maran, S. P. ; Sweigart, A. ; Kaiser, M. E. ; Linsky, J. ; Timothy, J. G. ; Lindler, D. ; Beck, T. ; Bohlin, R. C. ; Clampin, M. ; Grady, J. ; Loiacono, J. ; Krebs, C. / Ultraviolet spectral dating of stars and galaxies. In: Astrophysical Journal. 1998 ; Vol. 492, No. 2 PART II.
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AU - Heap, S. R.

AU - Brown, T. M.

AU - Hubeny, Ivan -

AU - Landsman, W.

AU - Yi, S.

AU - Fanelli, M.

AU - Gardner, J. P.

AU - Lanz, T.

AU - Maran, S. P.

AU - Sweigart, A.

AU - Kaiser, M. E.

AU - Linsky, J.

AU - Timothy, J. G.

AU - Lindler, D.

AU - Beck, T.

AU - Bohlin, R. C.

AU - Clampin, M.

AU - Grady, J.

AU - Loiacono, J.

AU - Krebs, C.

PY - 1998

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AB - An echelle spectrogram (R = 30,000) of the 2300-3100 Å 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 Å 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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KW - Ultraviolet: stars

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