First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars

S. Ragland; W.~A. Traub; J.-P. Berger; W.~C. Danchi; J.~D. Monnier; L.~A. Willson; N.~P. Carleton; M.~G. Lacasse; R. Millan-Gabet; E. Pedretti; F.~P. Schloerb; W.~D. Cotton; C.~H. Townes; M. Brewer; P. Haguenauer; P. Kern; P. Labeye; F. Malbet; D. Malin; M. Pearlman; K. Perraut; K. Souccar; G. Wallace

doi:10.1086/507453

First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars

S. Ragland, W.~A. Traub, J.-P. Berger, W.~C. Danchi, J.~D. Monnier, L.~A. Willson, N.~P. Carleton, M.~G. Lacasse, R. Millan-Gabet, E. Pedretti, F.~P. Schloerb, W.~D. Cotton, C.~H. Townes, M. Brewer, P. Haguenauer, P. Kern, P. Labeye, F. Malbet, D. Malin, M. PearlmanK. Perraut, K. Souccar, G. Wallace

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

70 Citations (Scopus)

Abstract

We have measured nonzero closure phases for about 29% of our sample of 56 nearby asymptotic giant branch (AGB) stars, using the three-telescope Infrared Optical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5-10 mas. These nonzero closure phases can only be generated by asymmetric brightness distributions of the target stars or their surroundings. We discuss how these results were obtained and how they might be interpreted in terms of structures on or near the target stars. We also report measured angular sizes and hypothesize that most Mira stars would show detectable asymmetry if observed with adequate angular resolution.

Original language	Undefined/Unknown
Pages (from-to)	650-660
Number of pages	11
Journal	Astrophysical Journal
Volume	652
Issue number	1
DOIs	https://doi.org/10.1086/507453
Publication status	Published - 20 Nov 2006

Keywords

Stars: Circumstellar Matter, Stars: AGB and Post-AGB, Stars: Imaging, Stars: Spots, Surveys, Techniques: Interferometric

Access to Document

10.1086/507453

Cite this

Ragland, S., Traub, W. A., Berger, J.-P., Danchi, W. C., Monnier, J. D., Willson, L. A., Carleton, N. P., Lacasse, M. G., Millan-Gabet, R., Pedretti, E., Schloerb, F. P., Cotton, W. D., Townes, C. H., Brewer, M., Haguenauer, P., Kern, P., Labeye, P., Malbet, F., Malin, D., ... Wallace, G. (2006). First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars. Astrophysical Journal, 652(1), 650-660. https://doi.org/10.1086/507453

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title = "First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars",

abstract = "We have measured nonzero closure phases for about 29% of our sample of 56 nearby asymptotic giant branch (AGB) stars, using the three-telescope Infrared Optical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5-10 mas. These nonzero closure phases can only be generated by asymmetric brightness distributions of the target stars or their surroundings. We discuss how these results were obtained and how they might be interpreted in terms of structures on or near the target stars. We also report measured angular sizes and hypothesize that most Mira stars would show detectable asymmetry if observed with adequate angular resolution.",

keywords = "Stars: Circumstellar Matter, Stars: AGB and Post-AGB, Stars: Imaging, Stars: Spots, Surveys, Techniques: Interferometric",

author = "S. Ragland and W.~A. Traub and J.-P. Berger and W.~C. Danchi and J.~D. Monnier and L.~A. Willson and N.~P. Carleton and M.~G. Lacasse and R. Millan-Gabet and E. Pedretti and F.~P. Schloerb and W.~D. Cotton and C.~H. Townes and M. Brewer and P. Haguenauer and P. Kern and P. Labeye and F. Malbet and D. Malin and M. Pearlman and K. Perraut and K. Souccar and G. Wallace",

year = "2006",

month = nov,

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doi = "10.1086/507453",

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volume = "652",

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Ragland, S, Traub, WA, Berger, J-P, Danchi, WC, Monnier, JD, Willson, LA, Carleton, NP, Lacasse, MG, Millan-Gabet, R, Pedretti, E, Schloerb, FP, Cotton, WD, Townes, CH, Brewer, M, Haguenauer, P, Kern, P, Labeye, P, Malbet, F, Malin, D, Pearlman, M, Perraut, K, Souccar, K & Wallace, G 2006, 'First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars', Astrophysical Journal, vol. 652, no. 1, pp. 650-660. https://doi.org/10.1086/507453

TY - JOUR

T1 - First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars

AU - Ragland, S.

AU - Traub, W.~A.

AU - Berger, J.-P.

AU - Danchi, W.~C.

AU - Monnier, J.~D.

AU - Willson, L.~A.

AU - Carleton, N.~P.

AU - Lacasse, M.~G.

AU - Millan-Gabet, R.

AU - Pedretti, E.

AU - Schloerb, F.~P.

AU - Cotton, W.~D.

AU - Townes, C.~H.

AU - Brewer, M.

AU - Haguenauer, P.

AU - Kern, P.

AU - Labeye, P.

AU - Malbet, F.

AU - Malin, D.

AU - Pearlman, M.

AU - Perraut, K.

AU - Souccar, K.

AU - Wallace, G.

PY - 2006/11/20

Y1 - 2006/11/20

N2 - We have measured nonzero closure phases for about 29% of our sample of 56 nearby asymptotic giant branch (AGB) stars, using the three-telescope Infrared Optical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5-10 mas. These nonzero closure phases can only be generated by asymmetric brightness distributions of the target stars or their surroundings. We discuss how these results were obtained and how they might be interpreted in terms of structures on or near the target stars. We also report measured angular sizes and hypothesize that most Mira stars would show detectable asymmetry if observed with adequate angular resolution.

AB - We have measured nonzero closure phases for about 29% of our sample of 56 nearby asymptotic giant branch (AGB) stars, using the three-telescope Infrared Optical Telescope Array (IOTA) interferometer at near-infrared wavelengths (H band) and with angular resolutions in the range 5-10 mas. These nonzero closure phases can only be generated by asymmetric brightness distributions of the target stars or their surroundings. We discuss how these results were obtained and how they might be interpreted in terms of structures on or near the target stars. We also report measured angular sizes and hypothesize that most Mira stars would show detectable asymmetry if observed with adequate angular resolution.

KW - Stars: Circumstellar Matter, Stars: AGB and Post-AGB, Stars: Imaging, Stars: Spots, Surveys, Techniques: Interferometric

U2 - 10.1086/507453

DO - 10.1086/507453

M3 - Article

SN - 0004-637X

VL - 652

SP - 650

EP - 660

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -