Zobrazeno 1 - 10
of 377
pro vyhledávání: '"WALLERSTEIN, GEORGE"'
Autor:
Sakari, Charli, Wallerstein, George
This paper presents [Fe/H] ratios for GCs in the outer halo of the Andromeda Galaxy, M31, based on moderate-resolution, integrated light (IL) spectroscopy of the calcium-II triplet (CaT) lines. The CaT strengths are measured by fitting Voigt profiles
Externí odkaz:
http://arxiv.org/abs/2203.08840
Autor:
Shetye, Shreeya, Van Eck, Sophie, Jorissen, Alain, Goriely, Stephane, Siess, Lionel, Van Winckel, Hans, Plez, Bertrand, Godefroid, Michel, Wallerstein, George
Publikováno v:
A&A 650, A118 (2021)
S stars are late-type giants that are transition objects between M-type stars and carbon stars on the asymptotic giant branch (AGB). They are classified into two types: intrinsic or extrinsic, based on the presence or absence of technetium (Tc). The
Externí odkaz:
http://arxiv.org/abs/2104.03161
G1, also known as Mayall II, is one of the most massive star clusters in M31. Its mass, ellipticity, and location in the outer halo make it a compelling candidate for a former nuclear star cluster. This paper presents an integrated light abundance an
Externí odkaz:
http://arxiv.org/abs/2012.03971
Autor:
Ritchey, Adam M., Jenkins, Edward B., Federman, Steven R., Rice, Johnathan S., Caprioli, Damiano, Wallerstein, George
Publikováno v:
ApJ, 897:83 (46pp), 2020
We present the results of a detailed investigation into the physical conditions in interstellar material interacting with the supernova remnant IC 443. Our analysis is based on a comprehensive examination of high-resolution far-ultraviolet spectra ob
Externí odkaz:
http://arxiv.org/abs/2005.09096
Autor:
Woolf, Vincent M., Wallerstein, George
We report iron and titanium abundance measurements from high resolution spectra in a volume-limited sample of 106 M0 and M0.5 dwarf stars. The sample includes stars north of the celestial equator and closer than 29 parsecs. The results imply that the
Externí odkaz:
http://arxiv.org/abs/2003.11447
Autor:
Sakari, Charli M., Roederer, Ian U., Placco, Vinicius M., Beers, Timothy C., Ezzeddine, Rana, Frebel, Anna, Hansen, Terese, Sneden, Christopher, Cowan, John J., Wallerstein, George, Farrell, Elizabeth M., Venn, Kim A., Matijevic, Gal, Wyse, Rosemary F. G., Bland-Hawthorn, Joss, Chiappini, Cristina, Freeman, Kenneth C., Gibson, Brad K., Grebel, Eva K., Helmi, Amina, Kordopatis, Georges, Kunder, Andrea, Navarro, Julio, Reid, Warren, Seabroke, George, Steinmetz, Matthias, Watson, Fred
A new moderately r-process-enhanced metal-poor star, RAVE J093730.5-062655, has been identified in the Milky Way halo as part of an ongoing survey by the R-Process Alliance. The temperature and surface gravity indicate that J0937-0626 is likely a hor
Externí odkaz:
http://arxiv.org/abs/1903.01480
In a step toward understanding the origin of the Galactic Halo, we have reexamined Type II Cepheids (T2C) in the field with new input from the second data release (DR2) of Gaia. For 45 T2C with periods from 1 to 20 days, parallaxes, proper motions, a
Externí odkaz:
http://arxiv.org/abs/1811.02003
Autor:
Sakari, Charli M., Placco, Vinicius M., Farrell, Elizabeth M., Roederer, Ian U., Wallerstein, George, Beers, Timothy C., Ezzeddine, Rana, Frebel, Anna, Hansen, Terese, Holmbeck, Erika M., Sneden, Christopher, Cowan, John J., Venn, Kim A., Davis, Christopher Evan, Matijevic, Gal, Wyse, Rosemary F. G., Bland-Hawthorn, Joss, Chiappini, Cristina, Freeman, Kenneth C., Gibson, Brad K., Grebel, Eva K., Helmi, Amina, Kordopatis, Georges, Kunder, Andrea, Navarro, Julio, Reid, Warren, Seabroke, George, Steinmetz, Matthias, Watson, Fred
This paper presents the detailed abundances and r-process classifications of 126 newly identified metal-poor stars as part of an ongoing collaboration, the R-Process Alliance. The stars were identified as metal-poor candidates from the RAdial Velocit
Externí odkaz:
http://arxiv.org/abs/1809.09156
Autor:
Hughes, Joanne, Lacy, Brianna, Sakari, Charli, Wallerstein, George, Davis, Christopher Evan, Schiefelbein, Spencer, Corrin, Olivia, Joudi, Hanah, Le, Donna, Haynes, Rose Marie
We present new SDSS and Washington photometry of the young, outer-halo stellar system, Segue 3. Combined with archival VI-observations, our most consistent results yield: $Z=0.006$, $\log(Age)=9.42$, $(m-M)_0=17.35$, $E(B-V)=0.09$, with a high binary
Externí odkaz:
http://arxiv.org/abs/1706.01961
Publikováno v:
Astrophysical Journal, 838:85 (2017)
We present data on the gas phase abundances for 9 different elements in the interstellar medium of the Small Magellanic Cloud (SMC), based on the strengths of ultraviolet absorption features over relevant velocities in the spectra of 18 stars within
Externí odkaz:
http://arxiv.org/abs/1705.02675