Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Lane, R R"'
We study systematics associated with estimating simple stellar population (SSP) parameters -- age, metallicity [M/H], $\alpha$-enhancement [$\alpha$/Fe] and IMF shape -- and associated $M_*/L$ gradients, of elliptical slow rotators (E-SRs), fast rota
Externí odkaz:
http://arxiv.org/abs/2211.05800
Autor:
Bernardi, M., Sheth, R. K., Sanchez, H. Dominguez, Margalef-Bentabol, B., Bizyaev, D., Lane, R. R.
Gradients in the stellar populations (SP) of galaxies -- e.g., in age, metallicity, stellar Initial Mass Function (IMF) -- can result in gradients in the stellar mass to light ratio, $M_*/L$. Such gradients imply that the distribution of the stellar
Externí odkaz:
http://arxiv.org/abs/2201.07810
Autor:
Sales-Silva, J. V., Daflon, S., Cunha, K., Souto, D., Smith, V. V., Chiappini, C., Donor, J., Frinchaboy, P. M., García-Hernández, D. A., Hayes, C., Majewski, S. R., Masseron, T., Schiavon, R. P., Weinberg, D. H., Beaton, R. L., Fernández-Trincado, J. G., Jönsson, H., Lane, R. R., Minniti, D., Manchado, A., Bidin, C. Moni, Nitschelm, C., O'Connell, J., Villanova, S.
The APOGEE Open Cluster Chemical Abundances and Mapping (OCCAM) survey is used to probe the chemical evolution of the s-process element cerium in the Galactic disk. Cerium abundances were derived from measurements of Ce II lines in the APOGEE spectra
Externí odkaz:
http://arxiv.org/abs/2112.02196
Autor:
Salvato, M., Wolf, J., Dwelly, T., Georgakakis, A., Brusa, M., Merloni, A., Liu, T., Toba, Y., Nandra, K., Lamer, G., Buchner, J., Schneider, C., Freund, S., Rau, A., Schwope, A., Nishizawa, A., Klein, M., Arcodia, R., Comparat, J., Musiimenta, B., Nagao, T., Brunner, H., Malyali, A., Finoguenov, A., Anderson, S., Shen, Y., Ibarra-Mendel, H., Trump, J., Brandt, W. N., Urry, C. M., Rivera, C., Krumpe, M., Urrutia, T., Miyaji, T., Ichikawa, K., Schneider, D. P., Fresco, A., Wilms, J., Boller, T., Haase, J., Brownstein, J., Lane, R. R., Bizyaev, D., Nitschelm, C.
Publikováno v:
A&A 661, A3 (2022)
In November 2019, eROSITA on board of SRG observatory started to map the entire sky in X-rays. After the 4-year survey program, it will reach flux limits about 25 times deeper than ROSAT. During the SRG Performance Verification phase, eROSITA observe
Externí odkaz:
http://arxiv.org/abs/2106.14520
Autor:
Gran, F., Zoccali, M., Rojas-Arriagada, A., Saviane, I., Ramos, R. Contreras, Beaton, R., Bizyaev, D., Cohen, R. E., Fernández-Trincado, J. G., García-Hernández, D. A., Geisler, D., Lane, R. R., Minniti, D., Bidin, C. Moni, Nitschelm, C., Carvajal, J. Olivares, Pan, K., Rojas, F. I., Villanova, S.
The second phase of the APOGEE survey is providing near-infrared, high-resolution, high signal-to-noise spectra of stars in the halo, disk, bar and bulge of the Milky Way. The near-infrared spectral window is especially important in the study of the
Externí odkaz:
http://arxiv.org/abs/2104.05865
Autor:
Queiroz, A. B. A., Chiappini, C., Perez-Villegas, A., Khalatyan, A., Anders, F., Barbuy, B., Santiago, B. X., Steinmetz, M., Cunha, K., Schultheis, M., Majewski, S. R., Minchev, I., Minniti, D., Beaton, R. L., Cohen, R. E., da Costa, L. N., Fernández-Trincado, J. G., Garcia-Hernández, D. A., Geisler, D., Hasselquist, S., Lane, R. R., Nitschelm, C., Rojas-Arriagada, A., Roman-Lopes, A., Smith, V., Zasowski, G.
Publikováno v:
A&A 656, A156 (2021)
We investigate the inner regions of the Milky Way with a sample of unprecedented size and coverage thanks to APOGEE DR16 and Gaia EDR3 data. Our inner Galactic sample has more than 26,000 stars within $|X_{\rm Gal}| <5$ kpc, $|Y_{\rm Gal}| <3.5$ kpc,
Externí odkaz:
http://arxiv.org/abs/2007.12915
Autor:
Queiroz, A. B. A., Anders, F., Chiappini, C., Khalatyan, A., Santiago, B. X., Steinmetz, M., Valentini, M., Miglio, A., Bossini, D., Barbuy, B., Minchev, I., Minniti, D., Hernández, D. A. García, Schultheis, M., Beaton, R. L., Beers, T. C., Bizyaev, D., Brownstein, J. R., Cunha, K., Fernández-Trincado, J. G., Frinchaboy, P. M., Lane, R. R., Majewski, S. R., Nataf, D., Nitschelm, C., Pan, K., Roman-Lopes, A., Sobeck, J. S., Stringfellow, G., Zamora, O.
Publikováno v:
A&A 638, A76 (2020)
We combine high-resolution spectroscopic data from APOGEE-2 Survey Data Release 16 (DR16) with broad-band photometric data from several sources, as well as parallaxes from {\it Gaia} Data Release 2 (DR2). Using the Bayesian isochrone-fitting code {\t
Externí odkaz:
http://arxiv.org/abs/1912.09778
Autor:
Schiappacasse-Ulloa, J., Tang, B., Fernández-Trincado, J. G., Zamora, O., Geisler, D., Frinchaboy, P., Schultheis, M., Dell'Agli, F., Villanova, S., Masseron, T., Mészáros, Sz., Souto, D., Hasselquist, S., Cunha, K., Smith, V. V., García-Hernández, D. A., Vieira, K., Robin, A. C., Minniti, D., Zasowski, G., Moreno, E., Pérez-Villegas, A., Lane, R. R., Ivans, I. I., Pan, K., Nitschelm, C., Santana, F. A., Carrera, R., Roman-Lopes, A.
IC 166 is an intermediate-age open cluster ($\sim 1$ Gyr) which lies in the transition zone of the metallicity gradient in the outer disc. Its location, combined with our very limited knowledge of its salient features, make it an interesting object o
Externí odkaz:
http://arxiv.org/abs/1806.09575
Autor:
Fernández-Trincado, José G., Zamora, O., Souto, Diogo, Cohen, R. E., Dell'Agli, F., García-Hernández, D. A., Masseron, T., Schiavon, R. P., Mészáros, Sz., Cunha, K., Hasselquist, Sten, Shetrone, M., Ulloa, J. Schiappacasse, Tang, B., Geisler, D., Schleicher, D. R. G., Villanova, S., Mennickent, R. E., Minniti, D., Alonso-Garcia, J., Manchado, A., Beers, T. C., Sobeck, J., Zasowski, G., Schultheis, M., Majewski, S. R., Rojas-Arriagada, A., Almeida, A., Santana, F., Oelkers, R. J., Longa-Peña, P., Carrera, R., Burgasser, A. J., Lane, R. R., Roman-Lopes, A., Ivans, Inese I., Hearty, F. R.
We present elemental abundance analysis of high-resolution spectra for five giant stars, deriving Fe, Mg, Al, C, N, O, Si and Ce abundances, and spatially located within the innermost regions of the bulge globular cluster NGC 6522, based on H-band sp
Externí odkaz:
http://arxiv.org/abs/1801.07136
Autor:
Fernández-Trincado, J. G., Zamora, O., Garcia-Hernandez, D. A., Souto, Diogo, Dell'Agli, F., Schiavon, R. P., Geisler, D., Tang, B., Villanova, S., Hasselquist, Sten, Mennickent, R. E., Cunha, Katia, Shetrone, M., Prieto, Carlos Allende, Vieira, K., Zasowski, G., Sobeck, J., Hayes, C. R., Majewski, S. R., Placco, V. M., Beers, T. C., Schleicher, D. R. G., Robin, A. C., Meszaros, Sz., Masseron, T., Perez, Ana E. Garcia, Anders, F., Meza, A., Alves-Brito, A., Carrera, R., Minniti, D., Lane, R. R., Fernandez-Alvar, E., Moreno, E., Pichardo, B., Perez-Villegas, A., Schultheis, M., Roman-Lopes, A., Fuentes, C. E., Nitschelm, C., Harding, P., Bizyaev, D., Pan, K., Oravetz, D., Simmons, A., Ivans, Inese I., Blanco-Cuaresma, S., Hernandez, J., Alonso-Garcia, J., Valenzuela, O., Chaname, J.
We report the peculiar chemical abundance patterns of eleven atypical Milky Way (MW) field red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). These atypical giants exhibit strong Al and N enhancements acc
Externí odkaz:
http://arxiv.org/abs/1707.03108