Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Tyler E. Nordgren"'
Publikováno v:
The Astrophysical Journal. 612:463-471
An asymmetric surface brightness distribution of the rapidly rotating A7IV-V star, Altair, has been measured by the Navy Prototype Optical Interferometer (NPOI). The observations were recorded simultaneously using a triangle of three long baselines o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80b26f26967116101fbdbfa41eb894c9
https://doi.org/10.1086/422422
https://doi.org/10.1086/422422
Publikováno v:
NASA Astrophysics Data System
We present the period-radius relations predicted by nonlinear convective models of Classical Cepheids and RR Lyrae stars. For the former variables we show that the metallicity effect is negligible for both fundamental and first overtone pulsators. Th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4cd99b7787d41ee7c88f8aaaabf424a1
https://doi.org/10.1017/s0252921100011222
https://doi.org/10.1017/s0252921100011222
Autor:
Massimo Marengo, Margarita Karovska, Dimitar D. Sasselov, Costas Papaliolios, John T. Armstrong, Tyler E. Nordgren
Publikováno v:
The Astrophysical Journal. 589:968-975
The geometric Baade-Wesselink method is one of the most promising techniques for obtaining a better calibration of the Cepheid period-luminosity relation by means of interferometric measurements of accurate diameters. In this paper we present new wav
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75c63fd2482623602bd75faabba59df8
https://doi.org/10.1086/374736
https://doi.org/10.1086/374736
Autor:
Tyler E. Nordgren, C. Papaliolios, Dimitar Sasselov, Massimo Marengo, Margarita Karovska, J. T. Armstrong
Publikováno v:
Astrophysics and Space Science. 286:185-190
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:
https://explore.openaire.eu/search/publication?articleId=doi_________::a6ef922648f6fb60824473f758bae135
https://doi.org/10.1023/a:1026171925432
https://doi.org/10.1023/a:1026171925432
Autor:
Tyler E. Nordgren, H. M. Dyck
Publikováno v:
The Astronomical Journal. 124:541-545
We review the systematic variation between optical- and infrared-wavelength angular diameters reported for stars in the approximate range of spectral types K0–M6. We show that there is a correlation between the ratio of angular diameters and the de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5c93b4e9a58754ad80fc09e48ed1d28
https://doi.org/10.1086/341039
https://doi.org/10.1086/341039
Publikováno v:
The Astronomical Journal. 123:3380-3386
Direct diameter observations of Cepheid variables are used to calibrate the Barnes-Evans Cepheid surface brightness relation. Fifty-nine separate Cepheid diameter measurements from four different optical interferometers are used to calculate surface
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2761960bf0874a9754453827d875b68
https://doi.org/10.1086/340567
https://doi.org/10.1086/340567
Publikováno v:
The Astronomical Journal. 122:2707-2712
The Navy Prototype Optical Interferometer (NPOI) has been used to measure the angular diameters of 41 late-type giant and supergiant stars previously observed with the Mark III optical interferometer. Sixteen of these stars have published angular dia
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::feaf6aaa5ef75c0fc8aae244e3de0c02
https://doi.org/10.1086/323546
https://doi.org/10.1086/323546
Autor:
David Mozurkewich, Arsen R. Hajian, Andrew F. Boden, Christian A. Hummel, Tyler E. Nordgren, N. Ginestet, J.-M. Carquillat, R. F. Griffin
Publikováno v:
The Astronomical Journal. 121:1623-1635
We present a three-dimensional solution for the orbit of the double star Omicron Leonis, based on new photoelectric radial velocity data mainly from the Observatoire de Haute-Provence and on interferometric data obtained with the Navy Prototype Optic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a14969fa8929d6be581a87d83a22947
https://doi.org/10.1086/319391
https://doi.org/10.1086/319391
Publikováno v:
The Astrophysical Journal. 544:176-187
Using complete redshift catalogs, we have compiled a list of galaxy pairs based solely on a pairs pro- jected separation, and velocity diUerence, *V. We have made high-velocity precision H I observations r p , of each galaxy in the sample and have re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe18763c7ccd2d7ba4068bdaac1625f7
https://doi.org/10.1086/317166
https://doi.org/10.1086/317166
Autor:
Robert B. Hindsley, J. T. Armstrong, Jeffrey J. Sudol, Tyler E. Nordgren, Arsen R. Hajian, C. A. Hummel, M. E. Germain
Publikováno v:
The Astrophysical Journal. 543:972-978
We present mean angular diameters for two cepheid variables, alpha Ursae Minoris and zeta Geminorum, determined with the Navy Prototype Optical Interferometer (NPOI). We present linear radii for these cepheids and two additional cepheids, delta Cephe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f66fb342c99e61ce919b24f865164255
https://doi.org/10.1086/317144
https://doi.org/10.1086/317144