Results 41 to 50 of about 2,627,055 (211)

Planetary Nebulae Populations in External Galaxies [PDF]

, 2011
This review highlights the properties of the planetary nebulae in external galaxies as tracers of light, of the stellar population properties, and of the distances and kinematics of the parent galaxies. Recent results on the kinematics of the outer regions in giant elliptical galaxies and on the luminosity specific PN numbers (the \alpha\ parameter) in
arxiv   +1 more source

Spectral variability of planetary nebulae and related objects [PDF]

Astron.&Astrophys. Transactions 4 (2005) 291-296, 2006
The results of long-term spectral observations were used to search for changes in planetary nebulae and emission-line stars. Significant increase of excitation degree is found in two objects: M1-6 and M1-11.
arxiv   +1 more source

Volatiles and refratories in solar analogs: no terrestial planet connection

, 2010
We have analysed very high-quality HARPS and UVES spectra of 95 solar analogs, 24 hosting planets and 71 without detected planets, to search for any possible signature of terrestial planets in the chemical abundances of volatile and refractory elements ...
Elisa Delgado-Mena, Garik Israelian, Jonay I. González Hernández, Neves, Nuno C. Santos, Ramírez, Ramírez, Sergio Sousa, Sousa, Stéphane Udry, Vasco Neves   +10 more
core   +1 more source

The Search for Other Planets and Life [PDF]

, 2010
This Les Houches School offers students a wide ranging view of the field of exoplanets and the search for life beyond the solar system. Observational and theoretical opportunities abound in a new field of astronomy that will be growing for decades to ...
Bean, Bennett, Bodenheimer, Boss, Burrows, Butler, Cash, Ch. Beichman, Charbonneau, Charbonneau, Chauvin, Chih-Hao, Deming, Des Marais, Fischer, Fridlund, Gaudi, Geisler, Gould, Ida, Ida, Johnson, Konacki, Lawson, Mao, Mayor, Nordman, Perryman, Richalet, Richardson, Saumon, Seager, Swain, Tanner, Tanner, Tarter, Traub, Trauger, Udry, Unwin, Wolsczan, Woolf, Wright   +42 more
core   +1 more source

Impact of Teachers With Research Experiences: Student Gains in STEM Career Awareness, Perception of Value of STEM Learning, and Persistence in STEM Course Tasks

Science Education, EarlyView.
ABSTRACT Research Experiences for Teachers (RET) programs are a burgeoning approach to engage teachers in STEM (science, technology, engineering, mathematics) research that they can translate into their K‐12 classrooms. Despite an increase in studies of RETs, there is a need for comparison of RET and non‐RET teachers' student outcomes.
John Keller, Sanlyn Buxner, Dermot Donnelly‐Hermosillo, Elsa Bailey, Martyna Citkowicz, Larry Horvath, Dan Moreno, Melissa Yisak, Bo Zhu, Eleanor Fulbeck, Deidre Sessoms, Stamatis Vokos, Charlotte Chen, Max Pardo   +13 more
wiley   +1 more source

A new channel for the detection of planetary systems through microlensing [PDF]

, 1997
We propose and evaluate the feasibility of a new strategy to search for planets via microlensing observations. This new strategy is designed to detect planets in "wide" orbits, i.e., with orbital separation, a, greater than ~1.5 R_E.
R. D. Stefano, Richard A. Scalzo Harvard-Smithsonian Center for Astrophysics, U. Chicago   +2 more
semanticscholar   +1 more source

Nano dust in space and astrophysics [PDF]

Proceedings of the International Astronomical Union, 2018
The theme of this focus meeting is related to the detection, characterization and modeling of nano particles — cosmic dust of sizes of roughly 1 to 100 nm — in space environments like the interstellar medium, planetary debris disks, the heliosphere, the ...
I. Mann, Aigen Li, Kyoko K. Tanaka
semanticscholar   +1 more source

The formation of Jupiter by hybrid pebble-planetesimal accretion [PDF]

, 2018
The standard model for giant planet formation is based on the accretion of solids by a growing planetary embryo, followed by rapid gas accretion once the planet exceeds a so-called critical mass.
Alibert, Yann, Ataiee, Sareh, Benz, Willy, Burn, Remo, Helled, Ravit, Mayer, Lucio, Mordasini, Christoph, Quanz, Sascha P., Schönbächler, Maria, Senecal, Luc, Venturini, Julia   +10 more
core   +2 more sources

Meteorites and the physico-chemical conditions in the early solar nebula

, 2008
Chondritic meteorites constitute the most ancient rock record available in the laboratory to study the formation of the solar system and its planets.
Aleon, Jerome
core   +3 more sources

Worlds Beyond: A Strategy for the Detection and Characterization of Exoplanets Executive Summary of a Report of the ExoPlanet Task Force Astronomy and Astrophysics Advisory Committee Washington, DC June 23, 2008 [PDF]

, 2008
[No ...
Fischer, Debra, Hammel, H. B., Henning, Thomas, Hillenbrand, Lynne, Kasting, James, Laughlin, Greg, Lunine, Jonathan I., Macintosh, Bruce, Marley, Mark, Melnick, Gary, Monet, David, Noecker, Charley, Peale, Stan, Quirrenbach, Andreas, Seager, Sara, Winn, Joshua N.   +15 more
core   +1 more source