Zobrazeno 1 - 10
of 22
pro vyhledávání: '"J. F. L. Simmons"'
Publikováno v:
Astronomy & Astrophysics. 496:503-511
Aims. We consider the polarization arising from scattering in an envelope illuminated by a central anisotropic source. This work extends the theory introduced in a previous paper (Al-Malki et al. 1999) in which scattering polarization from a spherica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80a075cdf5e08d808cc98d4cc52af8f4
https://doi.org/10.1051/0004-6361:200811214
https://doi.org/10.1051/0004-6361:200811214
Publikováno v:
Annals of the New York Academy of Sciences. 688
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa0b06735d2704535017b112fb82a2c2
https://pubmed.ncbi.nlm.nih.gov/26469457
https://pubmed.ncbi.nlm.nih.gov/26469457
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 336:501-510
We discuss the flux and polarization signals obtained from the microlensing of stars with extended circumstellar envelopes by a single point-mass lens. A previous paper considered the case of main-sequence stars, and showed that microlensing of the s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b287979a2f8ebcc9cdc6b43d8d21108
https://doi.org/10.1046/j.1365-8711.2002.05766.x
https://doi.org/10.1046/j.1365-8711.2002.05766.x
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 321:661-677
We examine the radial motion of a material particle in the intense radiation field of a static spherically symmetric compact object with spherical emitting surface outside the Schwarzschild radius. This paper generalizes previous work which dealt wit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf2b04c5a8db59bc57b24d40005f5e5c
https://doi.org/10.1046/j.1365-8711.2001.04014.x
https://doi.org/10.1046/j.1365-8711.2001.04014.x
Publikováno v:
Scopus-Elsevier
We investigate the feasibility of reconstructing the radial intensity profile of extended stellar sources by inverting their microlensed light curves. Using a simple, linear, limb darkening law as an illustration, we show that the intensity profile c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ded2339e232e0d77b0a8ddb065426c4
https://doi.org/10.1016/s1387-6473(98)00033-5
https://doi.org/10.1016/s1387-6473(98)00033-5
Publikováno v:
New Astronomy Reviews. 42:121-124
It has already been shown that microlensing can give rise to a non-zero variable polarisation signal. Here we use realistic simulations to demonstrate the additional information that can be gained from polarimetric observations of lensing events.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bbfe6d974b998cca7035b740329895b4
https://doi.org/10.1016/s1387-6473(98)00032-3
https://doi.org/10.1016/s1387-6473(98)00032-3
Autor:
J. F. L. Simmons, E. Audit
Scattering of starlight by dust, molecules and electrons in spiral galaxies will produce a modification of the direct intensity and a polarization in the observed light. We treat the case where the distribution of scatterers can be considered to be o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5aa3b54a469f3cf38907fe1c69588efc
Autor:
J. F. L. Simmons
Publikováno v:
Theoretical and Observational Cosmology ISBN: 9780792359463
The velocity of the Local Group with respect to the CMBR has been determined to be about 600 km s-1. A significant difference between the actual direction of motion and the direction to the nearest large cluster of galaxies, the Virgo cluster, led as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::60d90b71d94e980ef12e144a388fe724
https://doi.org/10.1007/978-94-011-4455-1_12
https://doi.org/10.1007/978-94-011-4455-1_12
Publikováno v:
Scopus-Elsevier
We describe a method for determining the limb polarization and limb darkening of stars in eclipsing binary systems, by inverting photometric and polarimetric light curves. Because of the ill-conditioning of the problem, we use the Backus-Gilbert meth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d1e6d0a687f4d519a0358a22c9b8022
Autor:
J. F. L. Simmons, Martin Hendry
The statistical properties of galaxy distance estimators are studied and a rigorous framework is developed for identifying and removing the effects of Malmquist bias due to obsevational selection. The prescription of Schechter (1980) for defining unb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aaf31e093c7abbca6bd6e56eaba80107