dc.contributor.author |
Elebert, Patrick |
|
dc.contributor.author |
Reynolds, M. T. |
|
dc.contributor.author |
Callanan, Paul J. |
|
dc.contributor.author |
Hurley, Daniel Jason |
|
dc.contributor.author |
Ramsay, G. |
|
dc.contributor.author |
Lewis, F. |
|
dc.contributor.author |
Russell, D. M. |
|
dc.contributor.author |
Nord, B. |
|
dc.contributor.author |
Kane, S. R. |
|
dc.contributor.author |
DePoy, D. L. |
|
dc.contributor.author |
Hakala, P. |
|
dc.date.accessioned |
2017-11-07T09:38:56Z |
|
dc.date.available |
2017-11-07T09:38:56Z |
|
dc.date.issued |
2009 |
|
dc.identifier.citation |
Elebert, P., Reynolds, M. T., Callanan, P. J., Hurley, D. J., Ramsay, G., Lewis, F., Russell, D. M., Nord, B., Kane, S. R., DePoy, D. L. and Hakala, P. (2009) 'Optical spectroscopy and photometry of SAX J1808.4−3658 in outburst', Monthly Notices of the Royal Astronomical Society, 395(2), pp. 884-894. doi: 10.1111/j.1365-2966.2009.14562.x |
en |
dc.identifier.volume |
395 |
|
dc.identifier.issued |
2 |
|
dc.identifier.startpage |
884 |
|
dc.identifier.endpage |
894 |
|
dc.identifier.issn |
0035-8711 |
|
dc.identifier.issn |
1365-2966 |
|
dc.identifier.uri |
http://hdl.handle.net/10468/4971 |
|
dc.identifier.doi |
10.1111/j.1365-2966.2009.14562.x |
|
dc.description.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 NIII lambda 4640.64 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(-0.004)(+0.005), and the mass function for the pulsar to be 0.44(-0.13)(+0.16)M(circle dot). 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 1.4M(circle dot). Our optical light curves exhibit a possible superhump modulation, expected for a system with such a low mass ratio. The equivalent width of the CaII H and K interstellar absorption lines suggest that the distance to the source is similar to 2.5 kpc. This is consistent with previous distance estimates based on type-IX-ray bursts which assume cosmic abundances of hydrogen, but lower than more recent estimates which assume helium-rich bursts. |
en |
dc.description.sponsorship |
European Southern Observatory (DDT 281, D-5060, 281. D-5061); Fermilab (DE-AC02-07CH11359);Las Cumbres Observatory ( Faulkes Telescope Project ) |
en |
dc.format.mimetype |
application/pdf |
en |
dc.language.iso |
en |
en |
dc.publisher |
Oxford University Press |
en |
dc.relation.uri |
https://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2009.14562.x |
|
dc.rights |
© 2009, the Authors. Journal compilation © 2009, RAS |
en |
dc.subject |
Accretion |
en |
dc.subject |
Accretion discs |
en |
dc.subject |
Binaries |
en |
dc.subject |
Close |
en |
dc.subject |
Stars |
en |
dc.subject |
Individual |
en |
dc.subject |
V4580 Sagittarii |
en |
dc.subject |
Stars |
en |
dc.subject |
Neutron |
en |
dc.subject |
Pulsars |
en |
dc.subject |
Individual |
en |
dc.subject |
SAX J1808.4-3658 |
en |
dc.subject |
X-rays |
en |
dc.subject |
Binaries |
en |
dc.title |
Optical spectroscopy and photometry of SAX J1808.4-3658 in outburst |
en |
dc.type |
Article (peer-reviewed) |
en |
dc.internal.authorcontactother |
Patrick Elebert, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: p.elebert@ucc.ie |
en |
dc.internal.availability |
Full text available |
en |
dc.description.version |
Published Version |
en |
dc.contributor.funder |
Dill Faulkes Educational Trust
|
|
dc.contributor.funder |
Science Foundation Ireland
|
|
dc.contributor.funder |
Fermilab
|
|
dc.contributor.funder |
Las Cumbres Observatory
|
|
dc.contributor.funder |
European Southern Observatory
|
|
dc.description.status |
Peer reviewed |
en |
dc.identifier.journaltitle |
Monthly Notices of the Royal Astronomical Society |
en |
dc.internal.IRISemailaddress |
p.elebert@ucc.ie |
en |