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A PUZZLE INVOLVING GALACTIC BULGE MICROLENSING EVENTS
| Indexado |
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| DOI | 10.1088/2041-8205/711/1/L48 | ||||
| Año | 2010 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
Abstract
We study a sample of 16 microlensed Galactic bulge main-sequence turnoff region stars for which high-dispersion spectra have been obtained with detailed abundance analyses. We demonstrate that there is a very strong and highly statistically significant correlation between the maximum magnification of the microlensed bulge star and the value of the [Fe/H] deduced from the high resolution spectrum of each object. Physics demands that this correlation, assuming it to be real, be the result of some sample bias. We suggest several possible explanations, but are forced to reject them all, and are left puzzled. To obtain a reliable metallicity distribution in the Galactic bulge based on microlensed dwarf stars, it will be necessary to resolve this issue through the course of additional observations.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Cohen, J. G. | Mujer |
CALTECH - Estados Unidos
Palomar Observatory - Estados Unidos |
| 2 | Gould, Andrew | - |
OHIO STATE UNIV - Estados Unidos
|
| 3 | Thompson, Ian B. | Hombre |
Observatorio Las Campanas - Estados Unidos
Carnegie Observ - Estados Unidos |
| 4 | Feltzing, S. | Mujer |
Lund Observ - Suecia
Lund Observatory - Suecia |
| 5 | Bensby, Thomas | Hombre |
ESO - Chile
European Southern Observatory Santiago - Chile Observatorio Europeo Austral - Chile |
| 6 | Johnson, John A. | Hombre |
OHIO STATE UNIV - Estados Unidos
The Ohio State University - Estados Unidos |
| 7 | Huang, Wenjin | - |
CALTECH - Estados Unidos
Palomar Observatory - Estados Unidos University of Washington, Seattle - Estados Unidos University of Washington - Estados Unidos |
| 8 | Melendez, J. | Hombre |
Univ Porto - Portugal
Universidade do Porto, Centro de Astrofísica - Portugal Centro de Astrofísica da Universidade do Porto - Portugal |
| 9 | Lucatello, Sara | Mujer |
Astron Observ Padova - Italia
TECH UNIV MUNICH - Alemania Osservatorio Astronomico di Padova - Italia Excellence Cluster Origins - Alemania Exzellenzcluster ORIGINS - Alemania |
| 10 | Asplund, M. | Hombre |
Max Planck Inst Astrophys - Alemania
Max Planck Institute for Astrophysics - Alemania |
| Fuente |
|---|
| National Science Foundation |
| NSF |
| Directorate for Mathematical and Physical Sciences |
| Direct For Mathematical & Physical Scien |
| Agradecimiento |
|---|
| We are grateful to the many people who have worked to make the Keck Telescope and HIRES a reality and to operate and maintain the Keck Observatory. The authors wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain we are privileged to be guests. Without their generous hospitality, none of the observations presented herein would have been possible. We thank Chris Hirata and Sterl Phinney for helpful discussions. J.G.C. thanks NSF grants AST-0507219 and AST-0908139 for partial support. Work by A. G. was supported by NSF grant AST-0757888. I. B. T. thanks NSF grant AST-0507325 for support. |
