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Observations of the pulsation of the Cepheid ℓ Car with the Sydney University Stellar Interferometer

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/137405

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Title: Observations of the pulsation of the Cepheid ℓ Car with the Sydney University Stellar Interferometer
Related: Monthly notices of the Royal Astronomical Society, Vol. 394, No. 3, (2009), p.1620-1630
DOI: 10.1111/j.1365-2966.2009.14433.x
Publisher: Wiley
Date: 2009
Author/Creator: Davis, J
Author/Creator: Jacob, A. P
Author/Creator: Robertson, J. G
Author/Creator: Ireland, M. J
Author/Creator: North, J. R
Author/Creator: Tango, W. J
Author/Creator: Tuthill, P. G
Description: Observations of the southern Cepheid ℓ Car to yield the mean angular diameter and angular pulsation amplitude have been made with the Sydney University Stellar Interferometer at a wavelength of 696 nm. The resulting mean limb-darkened angular diameter is 2.990 ± 0.017 mas (i.e. ± 0.6 per cent) with a maximum-to-minimum amplitude of 0.560 ± 0.018 mas corresponding to 18.7 ± 0.6 per cent in the mean stellar diameter. Careful attention has been paid to uncertainties, including those in measurements, in the adopted calibrator angular diameters, in the projected values of visibility squared at zero baseline, and to systematic effects. No evidence was found for a circumstellar envelope at 696 nm. The interferometric results have been combined with radial displacements of the stellar atmosphere derived from selected radial velocity data taken from the literature to determine the distance and mean diameter of ℓ Car. The distance is determined to be 525 ± 26 pc and the mean radius 169 ± 8 R ⊙. Comparison with published values for the distance and mean radius shows excellent agreement, particularly when a common scaling factor from observed radial velocity to pulsation velocity of the stellar atmosphere (the p-factor) is used.
Description: 11 page(s)
Subject Keyword: Stars: distances
Subject Keyword: Stars: individual: ℓ Car, HR 3884
Subject Keyword: Techniques: interferometric
Resource Type: journal article
Organisation: Macquarie University. Dept. of Physics and Astronomy

Identifier: http://hdl.handle.net/1959.14/137405
Identifier: ISSN:0035-8711
Identifier: mq_res-ext-2-s2.0-63549114141
Language: eng
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