The impact of starbursts on element abundance ratios
The impact of starbursts on element abundance ratios
复制标题
星暴对元素丰度比的影响
DOI:
10.1093/mnras/staa2431
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发表时间:
2020
影响因子:
4.8
通讯作者:
Weinberg, David H
中科院分区:
文献类型:
--
作者:
Johnson, James W;Weinberg, David H
We investigate the impact of bursts in star formation on the predictions of one-zone chemical evolution models, adopting oxygen (O), iron (Fe), and strontium (Sr), as representative α, iron-peak, and s-process elements, respectively. To this end, we develop and make use of theVersatile Integrator for Chemical Evolution(VICE), apythonpackage designed to handle flexible user-specified evolutionary parameters. Starbursts driven by a temporary boost of gas accretion rate create loops in [O/Fe]–[Fe/H] evolutionary tracks and a peak in the stellar [O/Fe] distribution at intermediate values. Bursts driven by a temporary boost of star formation efficiency have similar effects, and they also produce a population of α-deficient stars during the depressed star formation phase following the burst. This α-deficient population is more prominent if the outflow rate is tied to a time-averaged star formation rate (SFR) instead of the instantaneous SFR. Theoretical models of Sr production predict a strong metallicity dependence of supernova and asymptotic giant branch star yields, though comparison to data suggests an additional, nearly metallicity-independent source. Evolution of [Sr/Fe] and [Sr/O] during a starburst is complex because of this metallicity dependence and the multiple time-scales at play. Moderate amplitude (10–20 per cent) sinusoidal oscillations in SFR produce loops in [O/Fe]–[Fe/H] tracks and multiple peaks in [O/Fe] distributions, a potential source of intrinsic scatter in observed sequences. We investigate the impact of a factor ∼2 enhancement of Galactic star formation ∼2 Gyr ago, as suggested by some recent observations.VICEis publicly available at <http://pypi.org/project/vice/>.
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DOI:
10.1086/185930
发表时间:
1991
期刊:
The Astrophysical Journal
影响因子:
--
作者:
G. Gilmore;R. Wyse
通讯作者:
R. Wyse
影响因子:
4.8
作者:
A. Vlasov;B. Metzger;J. Lippuner;L. Roberts;T. Thompson
通讯作者:
A. Vlasov;B. Metzger;J. Lippuner;L. Roberts;T. Thompson
影响因子:
4.8
作者:
I. Seitenzahl;F. Ciaraldi-Schoolmann;F. Roepke;M. Fink;W. Hillebrandt;M. Kromer;R. Pakmor;A. Ruiter-A
通讯作者:
I. Seitenzahl;F. Ciaraldi-Schoolmann;F. Roepke;M. Fink;W. Hillebrandt;M. Kromer;R. Pakmor;A. Ruiter-A
影响因子:
4.9
作者:
J. Isern
通讯作者:
J. Isern
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
Jenna K C Freudenburg;D. Weinberg;M. Hayden;J. Holtzman
通讯作者:
J. Holtzman