Mass-loss rates in LMC and SMC O stars Virtual Observatory Resource

Authors
  1. Massa D.
  2. Fullerton A.W.
  3. Prinja R.K.
  4. Published by
    CDS
Abstract

We use a combination of BVJHK and Spitzer [3.6], [5.8] and [8.0] photometry to determine infrared (IR) excesses for a sample of 58 Large Magellanic Cloud and 46 Small Magellanic Cloud O stars. This sample is ideal for determining IR excesses because the very small line-of-sight reddening minimizes uncertainties due to extinction corrections. We use the core-halo model developed by Lamers & Waters to translate the excesses into mass-loss rates and demonstrate that the results of this simple model agree with the more sophisticated CMFGEN models to within a factor of 2. Taken at face value, the derived mass-loss rates are larger than those predicted by Vink et al. (2001A&A...369..574V), and the magnitude of the disagreement increases with decreasing luminosity. However, the IR excesses need not imply large mass-loss rates. Instead, we argue that they probably indicate that the outer atmospheres of O stars contain complex structures and that their winds are launched with much smaller velocity gradients than normally assumed. If this is the case, it could affect the theoretical and observational interpretations of the 'weak wind' problem, where classical mass-loss indicators suggest that the mass-loss rates of lower luminosity O stars are far less than expected.

Keywords
  1. Magellanic Clouds
  2. O stars
  3. Optical astronomy
  4. Wide-band photometry
  5. Effective temperature
Bibliographic source Bibcode
2017MNRAS.470.3765M
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/470/3765
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/470/3765

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/470/3765
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/470/3765
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/470/3765
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/470/3765/table13?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/470/3765/table13?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/470/3765/table13?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/470/3765/table24?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/470/3765/table24?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/470/3765/table24?

History

2020-06-13T10:21:11Z
Resource record created
2020-06-13T10:21:11Z
Created
2021-09-06T18:44:39Z
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