Zobrazeno 1 - 10
of 473
pro vyhledávání: '"Mateo, Mario"'
Autor:
Fu, Sal Wanying, Weisz, Daniel R., Starkenburg, Else, Martin, Nicolas, Collins, Michelle L. M., Savino, Alessandro, Boylan-Kolchin, Michael, Côté, Patrick, Dolphin, Andrew E., Longeard, Nicolas, Mateo, Mario L., Mercado, Francisco J., Sandford, Nathan R., Skillman, Evan D.
We present $\sim300$ stellar metallicity measurements in two faint M31 dwarf galaxies, Andromeda XVI ($M_V = -7.5$) and Andromeda XXVIII ($M_V = -8.8$) derived using metallicity-sensitive Calcium H & K narrow-band Hubble Space Telescope imaging. Thes
Externí odkaz:
http://arxiv.org/abs/2407.04698
Autor:
Cristofari, Paul I., Dupree, Andrea K., Milone, Antonino P., Walker, Matthew G., Mateo, Mario, Dotter, Aaron, Bailey III, John I.
We present an analysis of high-resolution optical spectra recorded for 30 stars of the split extended main-sequence turnoff (eMSTO) of the young ($\sim$ 40 Myr) Small Magellanic Cloud (SMC) globular cluster NGC 330. Spectra were obtained with the M2F
Externí odkaz:
http://arxiv.org/abs/2406.10413
Autor:
Garcia, Jonathan Cabrera, Sakari, Charli M., Roederer, Ian U., Evans, Donavon W., Silva, Pedro, Mateo, Mario, Song, Ying-Yi, Kremin, Anthony, Bailey III, John I., Walker, Matthew G.
M15 is a globular cluster with a known spread in neutron-capture elements. This paper presents abundances of neutron-capture elements for 62 stars in M15. Spectra were obtained with the Michigan/Magellan Fiber System (M2FS) spectrograph, covering a w
Externí odkaz:
http://arxiv.org/abs/2403.00063
Autor:
Huang, Ruoyun, Tang, Baitian, Li, Chengyuan, Geisler, Doug, Mateo, Mario, Song, Ying-Yi, Baumgardt, Holger, Carballo-Bello, Julio A., Wang, Yue, Nie, Jundan, Dias, Bruno, Fernández-Trincado, José G.
Star clusters were historically considered simple stellar populations, with all stars sharing the same age and initial chemical composition. However, the presence of chemical anomalies in globular clusters (GCs), called multiple stellar populations (
Externí odkaz:
http://arxiv.org/abs/2401.17584
Autor:
Walker, Matthew G., Caldwell, Nelson, Mateo, Mario, Olszewski, Edward W., Pace, Andrew B., Bailey III, John I., Koposov, Sergey E., Roederer, Ian U.
Publikováno v:
The Astrophysical Journal Supplement Series, 2023, Volume 268, Issue 1, id.19, 40 pp
We present spectroscopic data for 16369 stellar targets within and/or toward 38 dwarf spheroidal galaxies and faint star clusters within the Milky Way halo environment. All spectra come from observations with the multi-object, fiber-fed echelle spect
Externí odkaz:
http://arxiv.org/abs/2312.12738
Autor:
Fu, Sal Wanying, Weisz, Daniel R., Starkenburg, Else, Martin, Nicolas, Mercado, Francisco J., Savino, Alessandro, Boylan-Kolchin, Michael, Côté, Patrick, Dolphin, Andrew E., Longeard, Nicolas, Mateo, Mario L., Samuel, Jenna, Sandford, Nathan R.
We measure the metallicities of 374 red giant branch (RGB) stars in the isolated, quenched dwarf galaxy Tucana using Hubble Space Telescope (HST) narrow-band (F395N) Calcium H & K (CaHK) imaging. Our sample is a factor of $\sim7$ larger than what is
Externí odkaz:
http://arxiv.org/abs/2312.05981
Autor:
Crosby, Ethan, Jerjen, Helmut, Müller, Oliver, Pawlowski, Marcel S., Mateo, Mario, Lelli, Federico
We report the discovery of 40 new satellite dwarf galaxy candidates in the sphere of influence of the Sombrero galaxy (M104) the most luminous galaxy in the Local Volume. Using the Subaru Hyper Suprime-Cam, we surveyed 14.4 square degrees of its surr
Externí odkaz:
http://arxiv.org/abs/2312.03486
Autor:
Billi, Alex, Ferraro, Francesco R., Mucciarelli, Alessio, Lanzoni, Barbara, Cadelano, Mario, Monaco, Lorenzo, Mateo, Mario, Bailey III, John I., Reiter, Megan, Olszewski, Edward W.
We used high resolution spectra acquired at the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201. The surveyed sample includes Blue Stragglers Stars (BSSs) and referen
Externí odkaz:
http://arxiv.org/abs/2309.01442
Autor:
Johnson, Christian I., Rich, R. Michael, Caldwell, Nelson, Mateo, Mario, Bailey, John I., Olszewski, Edward W., Walker, Matthew G.
Photometric and spectroscopic analyses have shown that the Galactic bulge cluster Terzan 5 hosts several populations with different metallicities and ages that manifest as a double red horizontal branch (HB). A recent investigation of the massive bul
Externí odkaz:
http://hdl.handle.net/10150/626525
http://arizona.openrepository.com/arizona/handle/10150/626525
http://arizona.openrepository.com/arizona/handle/10150/626525
Autor:
Roederer, Ian U., Pace, Andrew B., Placco, Vinicius M., Caldwell, Nelson, Koposov, Sergey E., Mateo, Mario, Olszewski, Edward W., Walker, Matthew G.
We present stellar parameters and chemical abundances of 30 elements for five stars located at large radii (3.5-10.7 times the half-light radius) in the Sextans dwarf spheroidal galaxy. We selected these stars using proper motions, radial velocities,
Externí odkaz:
http://arxiv.org/abs/2307.02585