Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Deane M. Peterson"'
Publikováno v:
The Astrophysical Journal. 708:71-79
We present estimates of Vega's composition, mass, and age based on a simultaneous fit of high-resolution metal line profiles, the wings of the Balmer lines, the absolute visible/near-IR fluxes, and high angular resolution triple phase data from the N
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9d3373e946bc23bb41c2633a1ab7c3fe
https://doi.org/10.1088/0004-637x/708/1/71
https://doi.org/10.1088/0004-637x/708/1/71
Autor:
Thomas A. Pauls, Robert J. Zagarello, Deane M. Peterson, Henrique R. Schmitt, James H. Clark, J. Thomas Armstrong, Jinmi Yoon, G. Charmaine Gilbreath
Publikováno v:
Publications of the Astronomical Society of the Pacific. 119:437-443
We consider the problem introduced by rotation in the use of early-type stars as calibrators for optical interferometry. These objects have high surface brightnesses and hence are relatively bright, even with small angular diameters. However, rotatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1062f39bc88b0d0f5cdc73ffe676ff38
https://doi.org/10.1086/518270
https://doi.org/10.1086/518270
Autor:
G. C. Gilbreath, Arsen R. Hajian, Deane M. Peterson, R. N. Thessin, D. Mozurkewich, K. J. Johnston, J. T. Armstrong, C. A. Hummel
Publikováno v:
The Astronomical Journal. 131:2643-2651
We determine the masses and magnitude difference of the components of the Hyades spectroscopic binary θ2 Tauri. We find that both components appear to be less massive and/or brighter than predicted from some recent evolutionary models. The rapid rot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e4a652d8a14bda615fefe47e6a38fe92
https://doi.org/10.1086/501429
https://doi.org/10.1086/501429
Publikováno v:
Publications of the Astronomical Society of the Pacific, 114(799), 955-973. University of Chicago
We investigate the choice of stellar population for use as the Astrometric Grid for the Space Interferometry Mission (SIM). SIM depends on the astrometric stability of about 2000 stars, the so called Grid, against which the science measures are refer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::13d419a46e1f88e37aea952763b680ae
https://hdl.handle.net/11245/1.197893
https://hdl.handle.net/11245/1.197893
The discovery that Vega is a rapidly rotating pole-on star has raised a number of questions about this fundamental standard, including such issues as its composition, and in turn its mass and age. We report here a reanalysis of Vega's composition. A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c87ce70d769789864fb5df39a18548b0
Autor:
D. J. Hutter, Deane M. Peterson, J. A. Benson, Robert B. Hindsley, C. G. Gilbreath, J. T. Armstrong, Christian A. Hummel, K. J. Johnston, D. Mozurkewich, Thomas A. Pauls
Publikováno v:
The Power of Optical/IR Interferometry: Recent Scientific Results and 2nd Generation Instrumentation ISBN: 9783540742531
After a brief review of rotation among upper main sequence stars and von Zeipel’s vZ24 theory for the interiors, we describe our interferometric measurements of two bright A stars, Altair and Vega. The Navy Prototype Optical Interferometer (jointly
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5cc3b9c4ba9f615ab25e8c26e47ace0a
https://doi.org/10.1007/978-3-540-74256-2_5
https://doi.org/10.1007/978-3-540-74256-2_5
Publikováno v:
Advances in Stellar Interferometry.
Avalanche photodiodes offer many advantages for photon counting in the visible and near IR. However, as with all pulse counting systems, finite response times result in missed pulses as signal levels are increased. Further, APDs build up a pulse by a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69fb346d66b85b657244363e06403ea4
https://doi.org/10.1117/12.672094
https://doi.org/10.1117/12.672094
Autor:
Henrique R. Schmitt, Thomas A. Pauls, David Mozurkewich, Donald J. Hutter, James H. Clark, Deane M. Peterson, J. Thomas Armstrong, Robert B. Hindsley, Anders M. Jorgensen, R. T. Zavala, Christopher Tycner, G. Charmaine Gilbreath, James A. Benson
Publikováno v:
Advances in Stellar Interferometry.
We present the results of differential phase experiments done with data from the Navy Prototype Optical Interferometer (NPOI). We take advantage of the fact that this instrument simultaneously records 16 spectral channels in the wavelength range 550-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::46d174b08eeb9c3399375923ebf8cda5
https://doi.org/10.1117/12.672396
https://doi.org/10.1117/12.672396
Autor:
Thomas Armstrong, Deane M. Peterson, James H. Clark, Thomas A. Pauls, Henrique R. Schmitt, Charmaine Gilbreath, Jinmi Yoon
Publikováno v:
Advances in Stellar Interferometry.
Visibility measurements with Michelson interferometers, particularly the measurement of fringe contrast, are affected by various atmospheric and instrumental effects, all of which reduce the measured contrast. To compensate for this, stars with known
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b272be641340b9a71c2b7669a943830
https://doi.org/10.1117/12.670309
https://doi.org/10.1117/12.670309
Autor:
D. Mozurkewich, Henrique R. Schmitt, Robert B. Hindsley, Deane M. Peterson, G. Charmaine Gilbreath, J. Thomas Armstrong, Thomas A. Pauls, Anders M. Jorgensen
Publikováno v:
Advances in Stellar Interferometry.
Atmospheric turbulence is a major impediment to ground-based optical interferometry. It causes fringes to move on ms time-scales, forcing very short exposures. Because of the semi-random phase shifts, the traditional approach averages exposure power
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7177fe8a222776496b9fbf2b2ec28a6
https://doi.org/10.1117/12.672829
https://doi.org/10.1117/12.672829