Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Eric C. Williams"'
Publikováno v:
The Astronomical Journal. 132:1555-1570
A variability study of the young cluster IC 348 at Van Vleck Observatory has been extended to a total of seven years. Twelve new periodic stars have been found in the last two years, bringing the total discovered by this program to 40. In addition, w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::798985a50e40de6caf38713de66a1663
https://doi.org/10.1086/506985
https://doi.org/10.1086/506985
Publikováno v:
The Astronomical Journal. 126:348-352
A photometric study of the G-type pre–main-sequence star CB 34V was undertaken at Van Vleck Observatory during the 2001–2002 observing season. The star remained in its bright state throughout the 5 month monitoring period, showing no evidence of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9822dc4284a7c6c2e6c7468f8c15bb66
https://doi.org/10.1086/375756
https://doi.org/10.1086/375756
Autor:
Peter M. Thompson, James D. Moore, M. Mark Colavita, Eric C. Williams, Mark J. Sirota, Martin W. Regehr
Publikováno v:
SPIE Proceedings.
Finite element models (FEMs) are being used extensively in the design of the Thirty Meter Telescope (TMT). One such use is in the design and analysis of the Primary Segment Assembly (PSA). Each PSA supports one primary mirror segment on the mirror ce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9b1c104a0408176ea16579f09f49747d
https://doi.org/10.1117/12.858155
https://doi.org/10.1117/12.858155
Autor:
Larry M. Stepp, Benjamin C. Platt, Curtis Baffes, Alan Tubb, Terry Mast, Shahriar Setoodeh, Vince Stephens, Eric C. Williams, Jerry Nelson, Mark J. Sirota, Eric Ponslet, R. J. Ponchione
Publikováno v:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation.
This paper presents refinements to the design of the TMT primary mirror segment passive-support system that are effective in reducing gravity print-through and thermal distortion effects. First, a novel analytical method is presented for tuning the a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f9e88b54543512ab6f23d8b1633c9be
https://doi.org/10.1117/12.790176
https://doi.org/10.1117/12.790176
Autor:
Terry Mast, Eric C. Williams, Vince Stephens, Eric Ponslet, Larry M. Stepp, Curtis Baffes, Jerry Nelson
Publikováno v:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation.
The Thirty Meter Telescope (TMT) project, a partnership between ACURA, Caltech, and the University of California, is currently developing a 30-meter diameter optical telescope. The primary mirror will be composed of 492 low expansion glass segments.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e358c5cb5770561308b4dd73fb34d51
https://doi.org/10.1117/12.790206
https://doi.org/10.1117/12.790206
The recurrence of a previously documented eclipse of a solar-like pre--main-sequence star in the young cluster IC 348 has been observed. The recurrence interval is 4.7 $\pm 0.1$ yr and portions of 4 cycles have now been seen. The duration of each ecl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::afdc80b2ebd5b14cece84f2d4dbc89b4
http://arxiv.org/abs/astro-ph/0606501
http://arxiv.org/abs/astro-ph/0606501
Autor:
Eric Ponslet, Alan Tubb, Jerry Nelson, Mark J. Sirota, Terry Mast, Vince Stephens, R. J. Ponchione, Larry M. Stepp, Eric C. Williams, Dan Blanco, Myung Cho
Publikováno v:
SPIE Proceedings.
This paper describes the studies performed to establish a baseline conceptual design of the Segment Support Assembly (SSA) for the Thirty Meter Telescope (TMT) primary mirror. The SSA uses a combination of mechanical whiffletrees for axial support, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::270ab2d2d9fef20e7818bc18b3e8aac4
https://doi.org/10.1117/12.670604
https://doi.org/10.1117/12.670604
Five years of photometric monitoring of the T Tauri star HBC 338 in NGC 1333 has revealed that it is a periodic variable, but the period has changed significantly with time. From 2000-2003, a period near 5.6 days was observed, while in the last two s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ac2e7e27fb522f19164bb89b44e9e86
http://arxiv.org/abs/astro-ph/0606164
http://arxiv.org/abs/astro-ph/0606164
Publikováno v:
Lecture Notes in Computer Science ISBN: 9783540273240
OPODIS
Scopus-Elsevier
OPODIS
Scopus-Elsevier
A network is k-connected if it remains connected after the removal of any k–1 of its nodes. Assume that n sensors, modeled here as (omni)directional antennas, are dropped randomly and independently with the uniform distribution on the interior of a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a926b7fb46f8427419df8d50bd4ff79f
https://doi.org/10.1007/11516798_26
https://doi.org/10.1007/11516798_26
We have monitored four fields containing nine previously identified members of the MBM 12 association to search for photometric variability and periodicity in these pre-main sequence stars. Seven of the nine are found to be variable and definite peri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4b5f56dcb48fbf9e71853a850670f73b
http://arxiv.org/abs/astro-ph/0401085
http://arxiv.org/abs/astro-ph/0401085