Radiative contribution from stripped stars Virtual Observatory Resource

Authors
  1. Goetberg Y.
  2. de Mink S.E.
  3. Groh J.H.
  4. Leitherer C.
  5. Norman C.
  6. Published by
    CDS
Abstract

Stars stripped of their envelopes from interaction with a binary companion emit a significant fraction of their radiation as ionizing photons. They are potentially important stellar sources of ionizing radiation, however, they are still often neglected in spectral synthesis simulations or simulations of stellar feedback. In anticipating the large datasets of galaxy spectra from the upcoming James Webb Space Telescope, we modeled the radiative contribution from stripped stars by using detailed evolutionary and spectral models. We estimated their impact on the integrated spectra and specifically on the emission rates of HI-, HeI-, and HeII-ionizing photons from stellar populations. We find that stripped stars have the largest impact on the ionizing spectrum of a population in which star formation halted several Myr ago. In such stellar populations, stripped stars dominate the emission of ionizing photons, mimicking a younger stellar population in which massive stars are still present. Our models also suggest that stripped stars have harder ionizing spectra than massive stars. The additional ionizing radiation, with which stripped stars contribute affects observable properties that are related to the emission of ionizing photons from stellar populations. In co-eval stellar populations, the ionizing radiation from stripped stars increases the ionization parameter and the production efficiency of hydrogen ionizing photons. They also cause high values for these parameters for about ten times longer than what is predicted for massive stars. The effect on properties related to non-ionizing wavelengths is less pronounced, such as on the ultraviolet continuum slope or stellar contribution to emission lines. However, the hard ionizing radiation from stripped stars likely introduces a characteristic ionization structure of the nebula, which leads to the emission of highly ionized elements such as O^2+^ and C^3+^. We, therefore, expect that the presence of stripped stars affects the location in the BPT diagram and the diagnostic ratio of OIII to OII nebular emission lines. Our models are publicly available through CDS database and on the STARBURST99 website.

Keywords
  1. astronomical-models
  2. galaxies
  3. visible-astronomy
  4. stellar-populations
  5. spectroscopy
Bibliographic source Bibcode
2019A&A...629A.134G
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/629/A134
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/629/A134
Document Object Identifer DOI
doi:10.26093/cds/vizier.36290134

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/629/A134
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/629/A134
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/629/A134
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

History

2019-09-17T11:08:26Z
Resource record created
2019-09-17T11:08:26Z
Created
2023-05-26T15:06:49Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr