Zobrazeno 1 - 10
of 171
pro vyhledávání: '"Johnson, Christian I."'
Autor:
Butler, Evan, Kunder, Andrea, Prudil, Zdenek, Covey, Kevin R., Ball, Macy, Campos, Carlos, Gollnick, Kaylen, Carvajal, Julio Olivares, Hughes, Joanne, Devine, Kathryn, Johnson, Christian I., Vivas, A. Katherina, Rich, Michael R., Joyce, Meridith, Simon, Iulia T., Marchetti, Tommaso, Koch-Hansen, Andreas J., Clarkson, William I., Kuss, Rebekah
Patchick 99 is a candidate globular cluster located in the direction of the Galactic bulge, with a proper motion almost identical to the field and extreme field star contamination. A recent analysis suggests it is a low-luminosity globular cluster wi
Externí odkaz:
http://arxiv.org/abs/2401.13825
Autor:
Kunder, Andrea, Prudil, Zdenek, Covey, Kevin, Hughes, Joanne, Joyce, Meridith, Simion, Iulia T., Kuss, Rebekah, Campos, Carlos, Johnson, Christian I., Pilachowski, Catherine A., Larson, Kristen A., Koch-Hansen, Andreas J., Marchetti, Tommaso, Rich, Michael R., Butler, Evan, Clarkson, William I., Rivet, Michael J., Devine, Kathryn, Vivas, A. Katherina, Perren, Gabriel I., Soto, Mario, Silva, Erika
The Milky Way Bulge extra-tidal star survey (MWBest) is a spectroscopic survey with the goal of identifying stripped globular cluster stars from inner Galaxy clusters. In this way, an indication of the fraction of metal-poor bulge stars that originat
Externí odkaz:
http://arxiv.org/abs/2310.18575
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:
Molnár, László, Plachy, Emese, Bódi, Attila, Pál, András, Joyce, Meridith, Kalup, Csilla, Johnson, Christian I., Dencs, Zoltán, Mészáros, Szabolcs, Netzel, Henryka, Kinemuchi, Karen, Kollmeier, Juna A., Prieto, Jose Luis, Derekas, Aliz
Publikováno v:
A&A 678, A104 (2023)
The globular cluster Messier 80 was monitored by the Kepler space telescope for 80 days during the K2 mission. Continuous, high-precision photometry of such an old, compact cluster allows us to study its variable star population in unprecedented deta
Externí odkaz:
http://arxiv.org/abs/2308.01560
Autor:
Johnson, Christian I., Caldwell, Nelson, Rich, R. Michael, Mateo, Mario, Bailey III, John I., Olszewski, Edward W., Walker, Matthew G.
NGC 5986 is a poorly studied but relatively massive Galactic globular cluster that shares several physical and morphological characteristics with "iron-complex" clusters known to exhibit significant metallicity and heavy-element dispersions. In order
Externí odkaz:
http://hdl.handle.net/10150/624431
http://arizona.openrepository.com/arizona/handle/10150/624431
http://arizona.openrepository.com/arizona/handle/10150/624431
Autor:
Caldwell, Nelson, Walker, Matthew G., Mateo, Mario, Olszewski, Edward W., Koposov, Sergey, Belokurov, Vasily, Torrealba, Gabriel, Geringer-Sameth, Alex, Johnson, Christian I.
We present results from MMT/Hectochelle spectroscopy of 390 red giant candidate stars along the line of sight to the recently discovered Galactic satellite Crater 2. Modeling the joint distribution of stellar positions, velocities, and metallicities
Externí odkaz:
http://hdl.handle.net/10150/623952
http://arizona.openrepository.com/arizona/handle/10150/623952
http://arizona.openrepository.com/arizona/handle/10150/623952
Autor:
Johnson, Christian I., Caldwell, Nelson, Rich, R. Michael, Mateo, Mario, Bailey, III, John I., Clarkson, William I., Olszewski, Edward W., Walker, Matthew G.
Recent observations have shown that a growing number of the most massive Galactic globular clusters contain multiple populations of stars with different [Fe/H] and neutron-capture element abundances. NGC 6273 has only recently been recognized as a me
Externí odkaz:
http://hdl.handle.net/10150/623231
http://arizona.openrepository.com/arizona/handle/10150/623231
http://arizona.openrepository.com/arizona/handle/10150/623231
Autor:
Johnson, Christian I., Calamida, Annalisa, Kader, Justin A., Ferraro, Ivan, Pilachowski, Catherine A., Bono, Giuseppe, Mastrobuono-Battisti, Alessandra, Rest, Armin, Zenteno, Alfredo, Zocchi, Alice
Wide-field and deep DECam multi-band photometry, combined with HST data for the core of the Galactic globular cluster NGC 2808, allowed us to study the distribution of various stellar sub-populations and stars in different evolutionary phases out to
Externí odkaz:
http://arxiv.org/abs/2305.06419
Autor:
Ji, Alexander P., Simon, Joshua D., Roederer, Ian U., Magg, Ekaterina, Frebel, Anna, Johnson, Christian I., Klessen, Ralf S., Magg, Mattis, Cescutti, Gabriele, Mateo, Mario, Bergemann, Maria, Bailey III, John I.
The ultra-faint dwarf galaxy Reticulum~II was enriched by a single rare and prolific r-process event. The r-process content of Reticulum~II thus provides a unique opportunity to study metal mixing in a relic first galaxy. Using multi-object high-reso
Externí odkaz:
http://arxiv.org/abs/2207.03499
Autor:
Johnson, Christian I., Rich, R. Michael, Simion, Iulia T., Young, Michael D., Clarkson, William I., Pilachowski, Catherine A., Michael, Scott, Marchetti, Tommaso, Soto, Mario, Kunder, Andrea, Koch-Hansen, Andreas J., Vivas, A. Katherina, Joyce, Meridith, Shen, Juntai, Osmond, Alexis
We present photometric metallicity measurements for a sample of 2.6 million bulge red clump stars extracted from the Blanco DECam Bulge Survey (BDBS). Similar to previous studies, we find that the bulge exhibits a strong vertical metallicity gradient
Externí odkaz:
http://arxiv.org/abs/2206.14851