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

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

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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	English
Pages (from-to)	650-660
Number of pages	11
Journal	The Astrophysical Journal
Volume	652
Issue number	1
Publication status	Published - 1 Nov 2006

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http://adsabs.harvard.edu/abs/2006ApJ...652..650R

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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. The Astrophysical Journal, 652(1), 650-660. http://adsabs.harvard.edu/abs/2006ApJ...652..650R

@article{4cdd8331a2814571ad393dfff0372655,

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.",

author = "S. Ragland and Traub, {W. A.} and J.-P. Berger and Danchi, {W. C.} and Monnier, {J. D.} and Willson, {L. A.} and Carleton, {N. P.} and Lacasse, {M. G.} and R. Millan-Gabet and E. Pedretti and Schloerb, {F. P.} and Cotton, {W. D.} and Townes, {C. H.} 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,

day = "1",

language = "English",

volume = "652",

pages = "650--660",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

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', The Astrophysical Journal, vol. 652, no. 1, pp. 650-660. <http://adsabs.harvard.edu/abs/2006ApJ...652..650R>

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 - 2006/11/1

Y1 - 2006/11/1

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.

M3 - Article

SN - 0004-637X

VL - 652

SP - 650

EP - 660

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

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

Abstract

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