Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Sheffield, Allyson A."'
Autor:
Hawkins, Keith, Price-Whelan, Adrian M., Sheffield, Allyson A., Subrahimovic, Aidan Z., Beaton, Rachael L., Belokurov, Vasily, Erkal, Denis, Koposov, Sergey E., Lane, Richard R., Laporte, Chervin F. P., Nitschelm, Christian
Stellar streams in the Galactic halo are useful probes of the assembly of galaxies like the Milky Way. Many tidal stellar streams that have been found in recent years are accompanied by a known progenitor globular cluster or dwarf galaxy. However, th
Externí odkaz:
http://arxiv.org/abs/2205.14218
Publikováno v:
ASP2020: Embracing the Future: Astronomy Teaching and Public Engagement (2021) 531, 291
We present an Open Educational Resource system that instructors can use to assign automatically graded, randomized, and scaffolded assessment questions for astronomy classes.
Comment: 5 pages, 1 figure
Comment: 5 pages, 1 figure
Externí odkaz:
http://arxiv.org/abs/2111.15604
Autor:
Sheffield, Allyson A., Subrahimovic, Aidan Z., Refat, Mohammad, Beaton, Rachael L., Hasselquist, Sten, Hayes, Christian R., Price-Whelan, Adrian. M., Horta, Danny, Majewski, Steven R., Cunha, Katia, Smith, Verne V., Fernandez-Trincado, Jose G., Sobeck, Jennifer S., Munoz, Ricardo R., Garcia-Hernandez, D. A., Lane, Richard R., Nitschelm, Christian, Roman-Lopes, Alexandre
We present the kinematic and chemical profiles of red giant stars observed by the APOGEE-2 survey in the direction of the Jhelum stellar stream, a Milky Way substructure located in the inner halo of the Milky Way at a distance from the Sun of $\appro
Externí odkaz:
http://arxiv.org/abs/2103.07488
We analyze chemical abundances of stars in the Sagittarius (Sgr) tidal stream using high-resolution Gemini+GRACES spectra of 42 members of the highest surface brightness portions of both the trailing and leading arms. Targets were chosen using a 2MAS
Externí odkaz:
http://arxiv.org/abs/1805.04120
Autor:
Simion, Iulia T., Belokurov, Vasily, Koposov, Sergey E., Sheffield, Allyson, Johnston, Kathryn V.
We designed a follow-up program to find the spectroscopic properties of the Hercules-Aquila Cloud (HAC) and test scenarios for its formation. We measured the radial velocities (RVs) of 45 RR Lyrae in the southern portion of the HAC using the faciliti
Externí odkaz:
http://arxiv.org/abs/1803.05918
Autor:
Bergemann, Maria, Sesar, Branimir, Cohen, Judith G., Serenelli, Aldo M., Sheffield, Allyson, Li, Ting S., Casagrande, Luca, Johnston, Kathryn V., Laporte, Chervin F. P., Price-Whelan, Adrian M., Schoenrich, Ralph, Gould, Andrew
Our Galaxy is thought to have undergone an active evolutionary history dominated by star formation, the accretion of cold gas, and, in particular, mergers up to 10 gigayear ago. The stellar halo reveals rich fossil evidence of these interactions in t
Externí odkaz:
http://arxiv.org/abs/1803.00563
Autor:
Sheffield, Allyson A., Price-Whelan, Adrian M., Tzanidakis, Anastasios, Johnston, Kathryn V., Laporte, Chervin, Sesar, Branimir
The Monoceros Ring (also known as the Galactic Anticenter Stellar Structure) and A13 are stellar overdensities at estimated heliocentric distances of $d \sim 11$ kpc and 15 kpc observed at low Galactic latitudes towards the anticenter of our Galaxy.
Externí odkaz:
http://arxiv.org/abs/1801.01171
Autor:
Johnston, Kathryn V., Price-Whelan, Adrian M., Bergemann, Maria, Laporte, Chervin, Li, Ting S., Sheffield, Allyson A., Majewski, Steven R., Beaton, Rachael S., Sesar, Branimir, Sharma, Sanjib
Publikováno v:
Galaxies, 5, 44 (2017)
Deep photometric surveys of the Milky Way have revealed diffuse structures encircling our Galaxy far beyond the "classical" limits of the stellar disk. This paper reviews results from our own and other observational programs, which together suggest t
Externí odkaz:
http://arxiv.org/abs/1709.00491
Autor:
Li, Ting S., Sheffield, Allyson A., Johnston, Kathryn V., Marshall, Jennifer L., Majewski, Steven R., Price-Whelan, Adrian M., Damke, Guillermo J., Beaton, Rachael L., Bernard, Edouard J., Richardson, Whitney, Sharma, Sanjib, Sesar, Branimir
Thanks to modern sky surveys, over twenty stellar streams and overdensity structures have been discovered in the halo of the Milky Way. In this paper, we present an analysis of spectroscopic observations of individual stars from one such structure, "
Externí odkaz:
http://arxiv.org/abs/1703.05384
Autor:
Price-Whelan, Adrian M., Johnston, Kathryn V., Sheffield, Allyson A., Laporte, Chervin F. P., Sesar, Branimir
The Triangulum-Andromeda stellar clouds (TriAnd1 and TriAnd2) are a pair of concentric ring- or shell-like over-densities at large $R$ ($\approx$ 30 kpc) and $Z$ ($\approx$ -10 kpc) in the Galactic halo that are thought to have been formed from the a
Externí odkaz:
http://arxiv.org/abs/1503.08780