Search Results - "Da Costa, G. S"

Structural analysis of the Sextans dwarf spheroidal galaxy by Roderick, T. A., Jerjen, H., Da Costa, G. S., Mackey, A. D.

“…We present wide-field g- and i-band stellar photometry of the Sextans dwarf spheroidal galaxy and its surrounding area out to four times its half-light radius…”
Get full text

The outer envelopes of globular clusters. II. NGC 1851, NGC 5824 and NGC 1261 by Kuzma, P. B., Da Costa, G. S., Mackey, A. D.

“…Abstract We present a second set of results from a wide-field photometric survey of the environs of Milky Way globular clusters. The clusters studied are NGC…”
Get full text

The lowest detected stellar Fe abundance: the halo star SMSS J160540.18−144323.1 by Nordlander, T, Bessell, M S, Da Costa, G S, Mackey, A D, Asplund, M, Casey, A R, Chiti, A, Ezzeddine, R, Frebel, A, Lind, K, Marino, A F, Murphy, S J, Norris, J E, Schmidt, B P, Yong, D

“…ABSTRACT We report the discovery of SMSS J160540.18−144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure $\left[\rm…”
Get full text

The SkyMapper DR1.1 search for extremely metal-poor stars by Da Costa, G S, Bessell, M S, Mackey, A D, Nordlander, T, Asplund, M, Casey, A R, Frebel, A, Lind, K, Marino, A F, Murphy, S J, Norris, J E, Schmidt, B P, Yong, D

“…ABSTRACT We present and discuss the results of a search for extremely metal-poor stars based on photometry from data release DR1.1 of the SkyMapper imaging…”
Get full text

Multiple stellar populations in Magellanic Cloud clusters – IV. The double main sequence of the young cluster NGC 1755 by Milone, A. P., Marino, A. F., D'Antona, F., Bedin, L. R., Da Costa, G. S., Jerjen, H., Mackey, A. D.

“…Nearly all the star clusters with ages of ∼1–2 Gyr in both Magellanic Clouds exhibit an extended main-sequence turn-off (eMSTO) whose origin is under debate…”
Get full text

STELLAR SUBSTRUCTURES AROUND THE HERCULES DWARF SPHEROIDAL GALAXY by Roderick, T. A., Jerjen, H., Mackey, A. D., Costa, G. S. Da

“…ABSTRACT We present deep g and i band Dark Energy Camera stellar photometry of the Hercules Milky Way satellite galaxy, and its surrounding field, out to a…”
Get full text

A black hole detected in the young massive LMC cluster NGC 1850 by Saracino, S, Kamann, S, Guarcello, M G, Usher, C, Bastian, N, Cabrera-Ziri, I, Gieles, M, Dreizler, S, Da Costa, G S, Husser, T-O, Hénault-Brunet, V

“…ABSTRACT We report on the detection of a black hole (NGC 1850 BH1) in the ∼100-Myr-old massive cluster NGC 1850 in the Large Magellanic Cloud. It is in a…”
Get full text

The southern stellar stream spectroscopic survey (S5): Overview, target selection, data reduction, validation, and early science by Li, T S, Koposov, S E, Zucker, D B, Lewis, G F, Kuehn, K, Simpson, J D, Ji, A P, Shipp, N, Mao, Y-Y, Geha, M, Pace, A B, Mackey, A D, Allam, S, Tucker, D L, Da Costa, G S, Erkal, D, Simon, J D, Mould, J R, Martell, S L, Wan, Z, De Silva, G M, Bechtol, K, Balbinot, E, Belokurov, V, Bland-Hawthorn, J, Casey, A R, Cullinane, L, Drlica-Wagner, A, Sharma, S, Vivas, A K, Wechsler, R H, Yanny, B

“…ABSTRACT We introduce the southern stellar stream spectroscopy survey (S5), an on-going program to map the kinematics and chemistry of stellar streams in the…”
Get full text

Palomar 5 and its tidal tails: a search for new members in the tidal stream by Kuzma, P B, Da Costa, G S, Keller, S C, Maunder, E

“…In this paper, we present the results of a search for members of the globular cluster Palomar 5 and its associated tidal tails. The analysis has been performed…”
Get full text

Extended stellar substructure surrounding the Boötes I dwarf spheroidal galaxy by Roderick, T A, Mackey, A D, Jerjen, H, Da Costa, G S

“…We present deep stellar photometry of the Bootes I dwarf spheroidal galaxy in g- and i-band filters, taken with the Dark Energy Camera at Cerro Tololo in…”
Get full text

High-resolution spectroscopic follow-up of the most metal-poor candidates from SkyMapper DR1.1 by Yong, D, Da Costa, G S, Bessell, M S, Chiti, A, Frebel, A, Gao, X, Lind, K, Mackey, A D, Marino, A F, Murphy, S J, Nordlander, T, Asplund, M, Casey, A R, Kobayashi, C, Norris, J E, Schmidt, B P

“…ABSTRACT We present chemical abundances for 21 elements (from Li to Eu) in 150 metal-poor Galactic stars spanning −4.1 < [Fe/H] < −2.1. The targets were…”
Get full text

Extremely metal-poor stars from the cosmic dawn in the bulge of the Milky Way by Howes, L. M., Casey, A. R., Asplund, M., Keller, S. C., Yong, D., Nataf, D. M., Poleski, R., Lind, K., Kobayashi, C., Owen, C. I., Ness, M., Bessell, M. S., Da Costa, G. S., Schmidt, B. P., Tisserand, P., Udalski, A., Szymański, M. K., Soszyński, I., Pietrzyński, G., Ulaczyk, K., Wyrzykowski, Ł., Pietrukowicz, P., Skowron, J., Kozłowski, S., Mróz, P.

“…The first stars and their immediate successors should be found today in the central regions (bulges) of galaxies; old, metal-poor stars have now been found in…”
Get full text

M22: An [Fe/H] Abundance Range Revealed by Da Costa, G. S, Held, E. V, Saviane, I, Gullieuszik, M

“…Intermediate resolution spectra at the Ca II triplet have been obtained for 55 candidate red giants in the field of the globular cluster M22 with the VLT/FORS2…”
Get full text

A VLT/FLAMES STUDY OF THE PECULIAR INTERMEDIATE-AGE LARGE MAGELLANIC CLOUD STAR CLUSTER NGC 1846. I. KINEMATICS by Mackey, A D, da Costa, G S, Ferguson, A M N, Yong, D

“…In this paper we present high-resolution VLT/FLAMES observations of red giant stars in the massive intermediate- age Large Magellanic Cloud star cluster NGC…”
Get full text

THE DYNAMICS OF THE OUTER PARTS OF ω CENTAURI by DA COSTA, G. S

“…The multi-object fiber-fed spectrograph AAOmega at the Anglo-Australian Telescope has been used to establish and measure accurate ([< or =, slant]1 km s…”
Get full text

The Ca ii triplet in red giant spectra: [Fe/H] determinations and the role of [Ca/Fe] by Da Costa, G S

“…Measurements are presented and analysed of the strength of the Ca ii triplet lines in red giants in Galactic globular and open clusters, and in a sample of red…”
Get full text

Extending the Virgo Stellar Stream with SEKBO Survey RR Lyrae Stars by Prior, Sayuri L, Da Costa, G. S, Keller, Stefan C, Murphy, Simon J

“…A subset of the RR Lyrae (RRL) candidates identified from the Southern Edgeworth-Kuiper Belt Object (SEKBO) survey data have been followed up photometrically…”
Get full text

Exploring the Sagittarius Stream With SEKBO Survey RR Lyrae Stars by Prior, Sayuri L, Da Costa, G. S, Keller, Stefan C

“…A sample of RR Lyrae (RRL) variables from the Southern Edgeworth-Kuiper Belt Object survey in regions overlapping the expected position of debris from the…”
Get full text

The outer envelopes of globular clusters – I. NGC 7089 (M2) by Kuzma, P B, Da Costa, G S, Mackey, A D, Roderick, T A

“…We present the results of a wide-field imaging survey of the periphery of the Milky Way globular cluster NGC 7089 (M2). Data were obtained with MegaCam on the…”
Get full text

Star Formation History of the Small Magellanic Cloud: Six Hubble Space Telescope/Advanced Camera for Survey Fields by Sabbi, E, Gallagher, J. S, Tosi, M, Anderson, J, Nota, A, Grebel, E. K, Cignoni, M, Cole, A. A, Da Costa, G. S, Harbeck, D, Glatt, K, Marconi, M

“…We observed six fields of the Small Magellanic Cloud (SMC) with the Advanced Camera for Survey on board the Hubble Space Telescope in the F555W and F814W…”
Get full text