Ultraviolet spectral dating of stars and galaxies

S. R. Heap, T. M. Brown, I. Hubeny, W. Landsman, Sukyoung 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

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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
JournalAstrophysical Journal
Volume492
Issue number2 PART II
Publication statusPublished - 1998 Jan 1

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

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • 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).
Heap, S. R. ; Brown, T. M. ; Hubeny, I. ; Landsman, W. ; Yi, Sukyoung ; 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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title = "Ultraviolet spectral dating of stars and galaxies",
abstract = "An echelle spectrogram (R = 30,000) of the 2300-3100 {\AA} 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 {\AA} 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.",
author = "Heap, {S. R.} and Brown, {T. M.} and I. Hubeny and W. Landsman and Sukyoung Yi and M. Fanelli and Gardner, {J. P.} and T. Lanz and Maran, {S. P.} and A. Sweigart and Kaiser, {M. E.} and J. Linsky and Timothy, {J. G.} and D. Lindler and T. Beck and Bohlin, {R. C.} and M. Clampin and J. Grady and J. Loiacono and C. Krebs",
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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.

Ultraviolet spectral dating of stars and galaxies. / Heap, S. R.; Brown, T. M.; Hubeny, I.; Landsman, W.; Yi, Sukyoung; 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, 01.01.1998.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ultraviolet spectral dating of stars and galaxies

AU - Heap, S. R.

AU - Brown, T. M.

AU - Hubeny, I.

AU - Landsman, W.

AU - Yi, Sukyoung

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 - 1998/1/1

Y1 - 1998/1/1

N2 - 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.

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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M3 - Article

VL - 492

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART II

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Heap SR, Brown TM, Hubeny I, Landsman W, Yi S, Fanelli M et al. Ultraviolet spectral dating of stars and galaxies. Astrophysical Journal. 1998 Jan 1;492(2 PART II).