PittsburghV1, France, Analysis, bibRecord, 000142

No breakdown of the radiatively driven wind theory in low-metallicity environments

Identifieur interne : 000142 ( France/Analysis ); précédent : 000141; suivant : 000143

No breakdown of the radiatively driven wind theory in low-metallicity environments

Auteurs : J. C. Bouret [France] ; T. Lanz [France] ; D. J. Hillier [États-Unis] ; F. Martins [Belgique] ; W. L. F. Marcolino [France] ; E. Depagne [États-Unis]

Source :

Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2015-05.

RBID : Hal:hal-01439837

Abstract

We present a spectroscopic analysis of Hubble Space Telescope/Cosmic Origins Spectrograph observations of three massive stars in the low metallicity dwarf galaxies IC 1613 and WLM. These stars, were previously observed with Very Large Telescope (VLT)/X-shooter by Tramper et al., who claimed that their mass-loss rates are higher than expected from theoretical predictions for the underlying metallicity. A comparison of the far ultraviolet (FUV) spectra with those of stars of similar spectral types/luminosity classes in the Galaxy, and the Magellanic Clouds provides a direct, model-independent check of the mass-loss-metallicity relation. Then, a quantitative spectroscopic analysis is carried out using the non-LTE (NLTE) stellar atmosphere code CMFGEN. We derive the photospheric and wind characteristics, benefiting from a much better sensitivity of the FUV lines to wind properties than Ha. Iron and CNO abundances are measured, providing an independent check of the stellar metallicity. The spectroscopic analysis indicates that Z/Z(circle dot) = 1/5, similar to a Small Magellanic Cloud-type environment, and higher than usually quoted for IC 1613 and WLM. The mass-loss rates are smaller than the empirical ones by Tramper et al., and those predicted by the widely used theoretical recipe by Vink et al. On the other hand, we show that the empirical, FUV-based, mass-loss rates are in good agreement with those derived from mass fluxes computed by Lucy. We do not concur with Tramper et al. that there is a breakdown in the mass-loss-metallicity relation.

Url:

https://hal.archives-ouvertes.fr/hal-01439837

DOI: 10.1093/mnras/stv379

Affiliations:

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Le document en format XML

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          <desc>            <address>              <addrLine>INSU-CNRS3 rue Michel-Ange, 75794 Paris Cedex 16</addrLine>
              <country key="FR"></country>
            </address>
            <ref type="url">http://www.insu.cnrs.fr/</ref>
          </desc>
        </org>
</tutelle>
<tutelle name="UMR7326" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID">          <idno type="IdRef">02636817X</idno>
          <idno type="ISNI">0000000122597504</idno>
          <orgName>Centre National de la Recherche Scientifique</orgName>
          <orgName type="acronym">CNRS</orgName>
          <date type="start">1939-10-19</date>
          <desc>            <address>              <country key="FR"></country>
            </address>
            <ref type="url">http://www.cnrs.fr/</ref>
          </desc>
        </org>
</tutelle>
</tutelles>
</hal:affiliation>
<country>France</country>
<placeName><settlement type="city">Marseille</settlement>
<region type="region" nuts="2">Provence-Alpes-Côte d'Azur</region>
</placeName>
<orgName type="university">Université d'Aix-Marseille</orgName>
</affiliation>
</author>
<author><name sortKey="Depagne, E" sort="Depagne, E" uniqKey="Depagne E" first="E." last="Depagne">E. Depagne</name>
<affiliation wicri:level="1"><hal:affiliation type="institution" xml:id="struct-88084" status="VALID">          <orgName>Las Cumbres Observatory</orgName>
          <orgName type="acronym">LCO</orgName>
          <desc>            <address>              <addrLine>Goleta, CA 93117, USA</addrLine>
              <country key="US"></country>
            </address>
            <ref type="url">https://lco.global</ref>
          </desc>
        </hal:affiliation>
<country>États-Unis</country>
</affiliation>
</author>
</analytic>
<idno type="DOI">10.1093/mnras/stv379</idno>
<series><title level="j">Monthly Notices of the Royal Astronomical Society</title>
<idno type="ISSN">0035-8711</idno>
<imprint><date type="datePub">2015-05</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">We present a spectroscopic analysis of Hubble Space Telescope/Cosmic Origins Spectrograph observations of three massive stars in the low metallicity dwarf galaxies IC 1613 and WLM. These stars, were previously observed with Very Large Telescope (VLT)/X-shooter by Tramper et al., who claimed that their mass-loss rates are higher than expected from theoretical predictions for the underlying metallicity. A comparison of the far ultraviolet (FUV) spectra with those of stars of similar spectral types/luminosity classes in the Galaxy, and the Magellanic Clouds provides a direct, model-independent check of the mass-loss-metallicity relation. Then, a quantitative spectroscopic analysis is carried out using the non-LTE (NLTE) stellar atmosphere code CMFGEN. We derive the photospheric and wind characteristics, benefiting from a much better sensitivity of the FUV lines to wind properties than Ha. Iron and CNO abundances are measured, providing an independent check of the stellar metallicity. The spectroscopic analysis indicates that Z/Z(circle dot) = 1/5, similar to a Small Magellanic Cloud-type environment, and higher than usually quoted for IC 1613 and WLM. The mass-loss rates are smaller than the empirical ones by Tramper et al., and those predicted by the widely used theoretical recipe by Vink et al. On the other hand, we show that the empirical, FUV-based, mass-loss rates are in good agreement with those derived from mass fluxes computed by Lucy. We do not concur with Tramper et al. that there is a breakdown in the mass-loss-metallicity relation.</div>
</front>
</TEI>
<affiliations><list><country><li>Belgique</li>
<li>France</li>
<li>États-Unis</li>
</country>
<region><li>Pennsylvanie</li>
<li>Provence-Alpes-Côte d'Azur</li>
<li>Province du Brabant wallon</li>
<li>Région wallonne</li>
</region>
<settlement><li>Louvain-la-Neuve</li>
<li>Marseille</li>
<li>Pittsburgh</li>
</settlement>
<orgName><li>Université catholique de Louvain</li>
<li>Université d'Aix-Marseille</li>
<li>Université de Pittsburgh</li>
</orgName>
</list>
<tree><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Bouret, J C" sort="Bouret, J C" uniqKey="Bouret J" first="J. C." last="Bouret">J. C. Bouret</name>
</region>
<name sortKey="Lanz, T" sort="Lanz, T" uniqKey="Lanz T" first="T." last="Lanz">T. Lanz</name>
<name sortKey="Marcolino, W L F" sort="Marcolino, W L F" uniqKey="Marcolino W" first="W. L. F." last="Marcolino">W. L. F. Marcolino</name>
</country>
<country name="États-Unis"><region name="Pennsylvanie"><name sortKey="Hillier, D J" sort="Hillier, D J" uniqKey="Hillier D" first="D. J." last="Hillier">D. J. Hillier</name>
</region>
<name sortKey="Depagne, E" sort="Depagne, E" uniqKey="Depagne E" first="E." last="Depagne">E. Depagne</name>
</country>
<country name="Belgique"><region name="Région wallonne"><name sortKey="Martins, F" sort="Martins, F" uniqKey="Martins F" first="F." last="Martins">F. Martins</name>
</region>
</country>
</tree>
</affiliations>
</record>

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No breakdown of the radiatively driven wind theory in low-metallicity environments

No breakdown of the radiatively driven wind theory in low-metallicity environments

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