Zobrazeno 1 - 10
of 43
pro vyhledávání: '"John B. Lester"'
Autor:
Rachael M. Roettenbacher, Fabien Baron, Norman Vargas, John B. Lester, Judit Sturmann, Arturo O. Martinez, Olli Majoinen, Chris Farrington, Ettore Pedretti, Nicholas J. Scott, Hilding R. Neilson, Claudia Paladini, T. ten Brummelaar, Miguel Montargès, Gail H. Schaefer, Stephen T. Ridgway, Nathalie D. Thureau, Douglas R. Gies, Xiao Che, Ryan P. Norris, Andrea Chiavassa, Matthew D. Anderson, John D. Monnier, Michael S. Connelley, Laszlo Sturmann, László L. Kiss
Publikováno v:
The Astrophysical journal letters
The Astrophysical journal letters, Bristol : IOP Publishing, In press
The Astrophysical journal letters, Bristol : IOP Publishing, In press
We present H-band interferometric observations of the red supergiant (RSG) AZ Cyg made with the Michigan Infra-Red Combiner (MIRC) at the six-telescope Center for High Angular Resolution Astronomy (CHARA) Array. The observations span 5 years (2011-20
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1614489136484713b167a3d11323c0de
https://hal.archives-ouvertes.fr/hal-03367843
https://hal.archives-ouvertes.fr/hal-03367843
Publikováno v:
Publications of the Astronomical Society of the Pacific. 125:335-343
Mass is the most important stellar parameter, but it is not directly observable for a single star. Spherical model stellar atmospheres are explicitly characterized by their luminosity ($L_\star$), mass ($M_\star$) and radius ($R_\star$), and observat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5332059f7aec6465d4cbe222fd7a4004
https://doi.org/10.1086/670255
https://doi.org/10.1086/670255
Autor:
Hilding R. Neilson, John B. Lester
Publikováno v:
The Astrophysical Journal. 690:1829-1838
It has been observed that Cepheids in the Magellanic Clouds have lower masses for the same luminosity than those in the Milky Way. The model, from Neilson & Lester (2008), of pulsation-driven mass loss for Cepheids is applied to theoretical models of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0a79c3e9bca2485164401964757e154f
https://doi.org/10.1088/0004-637x/690/2/1829
https://doi.org/10.1088/0004-637x/690/2/1829
Autor:
Arsen R. Hajian, D. Mozurkewich, J. A. Benson, D. J. Hutter, J. T. Armstrong, John B. Lester, Thomas A. Pauls, Christopher Tycner, G. C. Gilbreath
Publikováno v:
The Astronomical Journal. 127:1194-1203
We present optical interferometric observations of the Be star Zeta Tauri obtained using the Navy Prototype Optical Interferometer (NPOI). The multichannel capability of the NPOI allows a high-quality internal calibration of the squared visibilities
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac78ee08aeb3378392d7b5318a442e37
https://doi.org/10.1086/381068
https://doi.org/10.1086/381068
Autor:
Nicole St-Louis, John B. Lester, Genevieve Ferland Caron, Gregg A. Wade, Anthony F. J. Moffat
Publikováno v:
The Astronomical Journal. 126:1415-1422
According to previous studies based on photometry alone, NGC 7419 reveals a surprisingly low ratio of blue to red supergiants: only one blue supergiant (BSG) along with a record number of five red supergiants (RSGs). However, for a cluster like NGC 7
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::753d280c4b7099eb978aee038ba9e233
https://doi.org/10.1086/377314
https://doi.org/10.1086/377314
Autor:
Thomas A. Pauls, Arsen R. Hajian, John B. Lester, Christopher Tycner, J. A. Benson, G. C. Gilbreath, D. J. Hutter, D. Mozurkewich, J. T. Armstrong
Publikováno v:
The Astronomical Journal. 125:3378-3388
We present a technique for calibrating optical long-baseline interferometric observations in which both the calibration corrections and the source characteristics are obtained from the observations of a program star. This calibration can only be appl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4db2d2090bc226cde6c338a393d1e62e
https://doi.org/10.1086/374994
https://doi.org/10.1086/374994
Autor:
Christopher Tycner, John B. Lester
Publikováno v:
Publications of the Astronomical Society of the Pacific. 114:330-339
The solar-like spectrophotometric variations due to nonradial oscillations were simulated using a series of synthetic spectra computed and interpolated from stellar model atmospheres, each in complete equilibrium but at varying effective temperatures
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::166fcedce4a158d173e9ce4a9673d487
https://doi.org/10.1086/339256
https://doi.org/10.1086/339256
Publikováno v:
The Astrophysical Journal. 845:65
The transit method, employed by MOST, \emph{Kepler}, and various ground-based surveys has enabled the characterization of extrasolar planets to unprecedented precision. These results are precise enough to begin to measure planet atmosphere compositio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8cceabda86a923fb7229072bb9eb8a50
https://doi.org/10.3847/1538-4357/aa7edf
https://doi.org/10.3847/1538-4357/aa7edf
Autor:
Devon Hamilton, John B. Lester
Publikováno v:
Publications of the Astronomical Society of the Pacific. 111:1132-1143
Convective motions in the solar photosphere produce line asymmetries that are traditionally studied using line bisectors observed with very high spectral resolution and signal-to-noise ratio. We study relative line-core shifts as a surrogate for bise
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea01e7bfdd906ae51185d3b03b4496a3
https://doi.org/10.1086/316421
https://doi.org/10.1086/316421
Autor:
John B. Lester, Devon Hamilton
Publikováno v:
International Astronomical Union Colloquium. 170:291-296
Convective motions in the photospheres of the Sun and solar-type stars can be studied using spectral line asymmetries via line bisectors and line shifts. Over the past few years there has been an improvement in the precision of the line positions for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e51f4af13321f65181592166168a1387
https://doi.org/10.1017/s0252921100048697
https://doi.org/10.1017/s0252921100048697