Zobrazeno 1 - 10
of 114
pro vyhledávání: '"ARMSTRONG, J T"'
Autor:
Armstrong, J. T., Jorgensen, A. M., Mozurkewich, D., Neilson, H. R., Baines, E. K., Schmitt, H. R., van Belle, G. T.
We introduce an observational tool based on visibility nulls in optical spectro-interferometry fringe data to probe the structure of stellar atmospheres. In a preliminary demonstration, we use both Navy Precision Optical Interferometer (NPOI) data an
Externí odkaz:
http://arxiv.org/abs/1907.10638
Autor:
Schmitt, H. R., Pauls, T. A., Armstrong, J. T., Mozurkewich, D., Jorgensen, A. M., Hindsley, R. B., Tycner, C., Zavala, R. T., Benson, J. A., Hutter, D. J.
Publikováno v:
Proc. SPIE, Vol. 7013, 70131H (2008)
Recovering images from optical interferometric observations is one of the major challenges in the field. Unlike the case of observations at radio wavelengths, in the optical the atmospheric turbulence changes the phases on a very short time scale, wh
Externí odkaz:
http://arxiv.org/abs/0809.1399
Autor:
Jorgensen, Anders M., Schmitt, H., Hindsley, R., Armstrong, J. T., Pauls, T. A., Mozurkewich, D., Hutter, D. J., Tycner, C.
In this paper we use coherently integrated visibilities (see separate paper in these proceedings, Jorgensen et al. 2008) to measure the properties of binary stars. We use only the phase of the complex visibility and not the amplitude. The reason for
Externí odkaz:
http://arxiv.org/abs/0807.3206
Autor:
Schmitt, H. R., Pauls, T. A., Tycner, C., Armstrong, J. T., Zavala, R. T., Benson, J. A., Gilbreath, G. C., Hindsley, R. B., Hutter, D. J., Johnston, K. J., Jorgensen, A. M., Mozurkewich, D.
Publikováno v:
Astrophys.J.691:984-996,2009
We present the results of an experiment to image the interacting binary star beta Lyrae with data from the Navy Prototype Optical Interferometer (NPOI), using a differential phase technique to correct for the effects of the instrument and atmosphere
Externí odkaz:
http://arxiv.org/abs/0801.4772
Autor:
Zavala, R. T., Adelman, S. J., Hummel, C. A., Gulliver, A. F., Caliskan, H., Armstrong, J. T., Hutter, D. J., Johnston, K. J., Pauls, T. A.
Publikováno v:
Astrophys.J.655:1046-1057,2007
Observations of the Mercury-Manganese star Phi Herculis with the Navy Prototype Optical Interferometer (NPOI) conclusively reveal the previously unseen companion in this single-lined binary system. The NPOI data were used to predict a spectral type o
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610811
Autor:
Peterson, D. M., Hummel, C. A., Pauls, T. A., Armstrong, J. T., Benson, J. A., Gilbreath, G. C., Hindsley, R. B., Hutter, D. J., Johnston, K. J., Mozurkewich, D., Schmitt, H. R.
Vega, the second brightest star in the northern hemisphere, serves as a primary spectral type standard. While its spectrum is dominated by broad hydrogen lines, the narrower lines of the heavy elements suggested slow to moderate rotation, giving conf
Externí odkaz:
http://arxiv.org/abs/astro-ph/0603520
Autor:
Tycner, C., Gilbreath, G. C., Zavala, R. T., Armstrong, J. T., Benson, J. A., Hajian, A. R., Hutter, D. J., Jones, C. E., Pauls, T. A., White, N. M.
Interferometric observations of two well-known Be stars, gamma Cas and phi Per, were collected and analyzed to determine the spatial characteristics of their circumstellar regions. The observations were obtained using the Navy Prototype Optical Inter
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602087
Autor:
Peterson, D. M., Hummel, C. A., Pauls, T. A., Armstrong, J. T., Benson, J. A., Gilbreath, C. G., Hindsley, R. B., Hutter, D. J., Johnston, K. J., Mozurkewich, D.
Publikováno v:
Astrophys.J.636:1087-1097,2006
We report successful fitting of a Roche model, with a surface temperature gradient following the von Zeipel gravity darkening law, to observations of Altair made with the Navy Prototype Optical Interferometer. We confirm the claim by Ohishi, Nordgren
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509236
Autor:
Tycner, Christopher, Lester, John B., Hajian, Arsen R., Armstrong, J. T., Benson, J. A., Gilbreath, G. C., Hutter, D. J., Pauls, T. A., White, N. M.
Publikováno v:
Astrophys.J. 624 (2005) 359-371
Long-baseline interferometric observations obtained with the Navy Prototype Optical Interferometer of the H-alpha-emitting envelopes of the Be stars eta Tauri and beta Canis Minoris are presented. For compatibility with the previously published inter
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501552
Autor:
Marengo, Massimo, Karovska, Margarita, Sasselov, Dimitar D., Papaliolios, Costas, Armstrong, J. T., Nordgren, Tyler
Publikováno v:
Astrophys.Space Sci. 286 (2003) 185-190
We present a new method to compute wavelength- and phase-dependent limb darkening corrections for classical Cepheids. These corrections are derived from hydrodynamic simulations and radiative transfer modeling with a full set of atomic and molecular
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303446