Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst
Identifieur interne : 000125 ( Main/Exploration ); précédent : 000124; suivant : 000126Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst
Auteurs : P. Elebert [Irlande (pays)] ; M. T. Reynolds [États-Unis] ; P. J. Callanan [Irlande (pays)] ; D. J. Hurley [Irlande (pays)] ; G. Ramsay ; F. Lewis [États-Unis] ; D. M. Russell [Pays-Bas] ; B. Nord [États-Unis] ; S. R. Kane [États-Unis] ; D. L. Depoy [États-Unis] ; P. Hakala [Finlande]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2009-05-11.
English descriptors
- KwdEn :
Abstract
We present phase resolved optical spectroscopy and photometry of V4580 Sagittarii, the optical counterpart to the accretion powered millisecond pulsar SAX J1808.4−3658, obtained during the 2008 September/October outburst. Doppler tomography of the N iiiλ4640.64 Bowen blend emission line reveals a focused spot of emission at a location consistent with the secondary star. The velocity of this emission occurs at 324 ± 15 km s−1; applying a ‘K‐correction’, we find the velocity of the secondary star projected on to the line of sight to be 370 ± 40 km s−1. Based on existing pulse timing measurements, this constrains the mass ratio of the system to be 0.044+0.005−0.004, and the mass function for the pulsar to be 0.44+0.16−0.13 M⊙. Combining this mass function with various inclination estimates from other authors, we find no evidence to suggest that the neutron star in SAX J1808.4−3658 is more massive than the canonical value of 1.4 M⊙. Our optical light curves exhibit a possible superhump modulation, expected for a system with such a low mass ratio. The equivalent width of the Ca ii H and K interstellar absorption lines suggest that the distance to the source is ∼2.5 kpc. This is consistent with previous distance estimates based on type‐I X‐ray bursts which assume cosmic abundances of hydrogen, but lower than more recent estimates which assume helium‐rich bursts.
Url:
DOI: 10.1111/j.1365-2966.2009.14562.x
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst</title><author><name sortKey="Elebert, P" sort="Elebert, P" uniqKey="Elebert P" first="P." last="Elebert">P. Elebert</name></author><author><name sortKey="Reynolds, M T" sort="Reynolds, M T" uniqKey="Reynolds M" first="M. T." last="Reynolds">M. T. Reynolds</name></author><author><name sortKey="Callanan, P J" sort="Callanan, P J" uniqKey="Callanan P" first="P. J." last="Callanan">P. J. Callanan</name></author><author><name sortKey="Hurley, D J" sort="Hurley, D J" uniqKey="Hurley D" first="D. J." last="Hurley">D. J. Hurley</name></author><author><name sortKey="Ramsay, G" sort="Ramsay, G" uniqKey="Ramsay G" first="G." last="Ramsay">G. Ramsay</name></author><author><name sortKey="Lewis, F" sort="Lewis, F" uniqKey="Lewis F" first="F." last="Lewis">F. Lewis</name></author><author><name sortKey="Russell, D M" sort="Russell, D M" uniqKey="Russell D" first="D. M." last="Russell">D. M. Russell</name></author><author><name sortKey="Nord, B" sort="Nord, B" uniqKey="Nord B" first="B." last="Nord">B. Nord</name></author><author><name sortKey="Kane, S R" sort="Kane, S R" uniqKey="Kane S" first="S. R." last="Kane">S. R. Kane</name></author><author><name sortKey="Depoy, D L" sort="Depoy, D L" uniqKey="Depoy D" first="D. L." last="Depoy">D. L. Depoy</name></author><author><name sortKey="Hakala, P" sort="Hakala, P" uniqKey="Hakala P" first="P." last="Hakala">P. Hakala</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:105A7E28835EC84E7DB0D4AC3200784D48F3A07F</idno><date when="2009" year="2009">2009</date><idno type="doi">10.1111/j.1365-2966.2009.14562.x</idno><idno type="url">https://api.istex.fr/document/105A7E28835EC84E7DB0D4AC3200784D48F3A07F/fulltext/pdf</idno><idno type="wicri:Area/Main/Corpus">000879</idno><idno type="wicri:Area/Main/Curation">000879</idno><idno type="wicri:Area/Main/Exploration">000125</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Exploration">000125</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst</title><author><name sortKey="Elebert, P" sort="Elebert, P" uniqKey="Elebert P" first="P." last="Elebert">P. Elebert</name><affiliation wicri:level="1"><country xml:lang="fr">Irlande (pays)</country><wicri:regionArea>Department of Physics, University College Cork, Cork</wicri:regionArea><wicri:noRegion>Cork</wicri:noRegion></affiliation></author><author><name sortKey="Reynolds, M T" sort="Reynolds, M T" uniqKey="Reynolds M" first="M. T." last="Reynolds">M. T. Reynolds</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109‐1042</wicri:regionArea><wicri:noRegion>MI 48109‐1042</wicri:noRegion></affiliation></author><author><name sortKey="Callanan, P J" sort="Callanan, P J" uniqKey="Callanan P" first="P. J." last="Callanan">P. J. Callanan</name><affiliation wicri:level="1"><country xml:lang="fr">Irlande (pays)</country><wicri:regionArea>Department of Physics, University College Cork, Cork</wicri:regionArea><wicri:noRegion>Cork</wicri:noRegion></affiliation></author><author><name sortKey="Hurley, D J" sort="Hurley, D J" uniqKey="Hurley D" first="D. J." last="Hurley">D. J. Hurley</name><affiliation wicri:level="1"><country xml:lang="fr">Irlande (pays)</country><wicri:regionArea>Department of Physics, University College Cork, Cork</wicri:regionArea><wicri:noRegion>Cork</wicri:noRegion></affiliation></author><author><name sortKey="Ramsay, G" sort="Ramsay, G" uniqKey="Ramsay G" first="G." last="Ramsay">G. Ramsay</name><affiliation><wicri:noCountry code="subField">9DG</wicri:noCountry></affiliation></author><author><name sortKey="Lewis, F" sort="Lewis, F" uniqKey="Lewis F" first="F." last="Lewis">F. Lewis</name><affiliation></affiliation><affiliation></affiliation><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Las Cumbres Observatory Global Telescope, 6740 Cortona Drive, Goleta, CA 93117</wicri:regionArea><wicri:noRegion>CA 93117</wicri:noRegion></affiliation></author><author><name sortKey="Russell, D M" sort="Russell, D M" uniqKey="Russell D" first="D. M." last="Russell">D. M. Russell</name><affiliation wicri:level="1"><country xml:lang="fr" wicri:curation="lc">Pays-Bas</country><wicri:regionArea>Astronomical Institute ‘Anton Pannekoek’, Kruislaan 403, 1098 SJ Amsterdam</wicri:regionArea><wicri:noRegion>1098 SJ Amsterdam</wicri:noRegion></affiliation></author><author><name sortKey="Nord, B" sort="Nord, B" uniqKey="Nord B" first="B." last="Nord">B. Nord</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Physics Department, University of Michigan, 450 Church Street, Ann Arbor, MI 48109‐1040</wicri:regionArea><wicri:noRegion>MI 48109‐1040</wicri:noRegion></affiliation></author><author><name sortKey="Kane, S R" sort="Kane, S R" uniqKey="Kane S" first="S. R." last="Kane">S. R. Kane</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>NASA Exoplanet Science Institute, Caltech, MS 100‐22, 770 South Wilson Avenue, Pasadena, CA 91125</wicri:regionArea><wicri:noRegion>CA 91125</wicri:noRegion></affiliation></author><author><name sortKey="Depoy, D L" sort="Depoy, D L" uniqKey="Depoy D" first="D. L." last="Depoy">D. L. Depoy</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, Texas A&M University, 4242 TAMU, College Station, TX 77843‐4242</wicri:regionArea><wicri:noRegion>TX 77843‐4242</wicri:noRegion></affiliation></author><author><name sortKey="Hakala, P" sort="Hakala, P" uniqKey="Hakala P" first="P." last="Hakala">P. Hakala</name><affiliation wicri:level="4"><country xml:lang="fr">Finlande</country><wicri:regionArea>Tuorla Observatory, University of Turku, Väisäläntie 20, FIN‐21500 Piikkiö</wicri:regionArea><orgName type="university">Université de Turku</orgName><placeName><settlement type="city">Turku</settlement><region type="région" nuts="2">Finlande occidentale</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2009-05-11">2009-05-11</date><biblScope unit="volume">395</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="884">884</biblScope><biblScope unit="page" to="894">894</biblScope></imprint><idno type="ISSN">0035-8711</idno></series><idno type="istex">105A7E28835EC84E7DB0D4AC3200784D48F3A07F</idno><idno type="DOI">10.1111/j.1365-2966.2009.14562.x</idno><idno type="ArticleID">MNR14562</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>X‐rays: binaries</term><term>accretion, accretion discs</term><term>binaries: close</term><term>pulsars: individual: SAX J1808.4−3658</term><term>stars: individual: V4580 Sagittarii</term><term>stars: neutron</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present phase resolved optical spectroscopy and photometry of V4580 Sagittarii, the optical counterpart to the accretion powered millisecond pulsar SAX J1808.4−3658, obtained during the 2008 September/October outburst. Doppler tomography of the N iiiλ4640.64 Bowen blend emission line reveals a focused spot of emission at a location consistent with the secondary star. The velocity of this emission occurs at 324 ± 15 km s−1; applying a ‘K‐correction’, we find the velocity of the secondary star projected on to the line of sight to be 370 ± 40 km s−1. Based on existing pulse timing measurements, this constrains the mass ratio of the system to be 0.044+0.005−0.004, and the mass function for the pulsar to be 0.44+0.16−0.13 M⊙. Combining this mass function with various inclination estimates from other authors, we find no evidence to suggest that the neutron star in SAX J1808.4−3658 is more massive than the canonical value of 1.4 M⊙. Our optical light curves exhibit a possible superhump modulation, expected for a system with such a low mass ratio. The equivalent width of the Ca ii H and K interstellar absorption lines suggest that the distance to the source is ∼2.5 kpc. This is consistent with previous distance estimates based on type‐I X‐ray bursts which assume cosmic abundances of hydrogen, but lower than more recent estimates which assume helium‐rich bursts.</div></front></TEI><affiliations><list><country><li>Finlande</li><li>Irlande (pays)</li><li>Pays-Bas</li><li>États-Unis</li></country><region><li>Finlande occidentale</li></region><settlement><li>Turku</li></settlement><orgName><li>Université de Turku</li></orgName></list><tree><noCountry><name sortKey="Ramsay, G" sort="Ramsay, G" uniqKey="Ramsay G" first="G." last="Ramsay">G. Ramsay</name></noCountry><country name="Irlande (pays)"><noRegion><name sortKey="Elebert, P" sort="Elebert, P" uniqKey="Elebert P" first="P." last="Elebert">P. Elebert</name></noRegion><name sortKey="Callanan, P J" sort="Callanan, P J" uniqKey="Callanan P" first="P. J." last="Callanan">P. J. Callanan</name><name sortKey="Hurley, D J" sort="Hurley, D J" uniqKey="Hurley D" first="D. J." last="Hurley">D. J. Hurley</name></country><country name="États-Unis"><noRegion><name sortKey="Reynolds, M T" sort="Reynolds, M T" uniqKey="Reynolds M" first="M. T." last="Reynolds">M. T. Reynolds</name></noRegion><name sortKey="Depoy, D L" sort="Depoy, D L" uniqKey="Depoy D" first="D. L." last="Depoy">D. L. Depoy</name><name sortKey="Kane, S R" sort="Kane, S R" uniqKey="Kane S" first="S. R." last="Kane">S. R. Kane</name><name sortKey="Lewis, F" sort="Lewis, F" uniqKey="Lewis F" first="F." last="Lewis">F. Lewis</name><name sortKey="Nord, B" sort="Nord, B" uniqKey="Nord B" first="B." last="Nord">B. Nord</name></country><country name="Pays-Bas"><noRegion><name sortKey="Russell, D M" sort="Russell, D M" uniqKey="Russell D" first="D. M." last="Russell">D. M. Russell</name></noRegion></country><country name="Finlande"><region name="Finlande occidentale"><name sortKey="Hakala, P" sort="Hakala, P" uniqKey="Hakala P" first="P." last="Hakala">P. Hakala</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/Amerique/explor/CaltechV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000125 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000125 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Wicri/Amerique
|area= CaltechV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= ISTEX:105A7E28835EC84E7DB0D4AC3200784D48F3A07F
|texte= Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst
}}
| This area was generated with Dilib version V0.6.32. |  |