Zobrazeno 1 - 10
of 789
pro vyhledávání: '"Preston, G A"'
Autor:
Sieverding, Andre, Waldrop, Preston G., Harris, J. Austin, Hix, W. Raphael, Lentz, Eric J., Bruenn, Stephen W., Messer, O. E. Bronson
After decades, the theoretical study of core-collapse supernova explosions is moving from parameterized, spherically symmetric models to increasingly realistic multi-dimensional simulations. Obtaining nucleosynthesis yields based on such multi-dimens
Externí odkaz:
http://arxiv.org/abs/2212.06507
Autor:
Fabrizio, M., Braga, V. F., Crestani, J., Bono, G., Ferraro, I., Fiorentino, G., Iannicola, G., Preston, G. W., Sneden, C., Thévenin, F., Altavilla, G., Chaboyer, B., Dall'Ora, M., da Silva, R., Grebel, E. K., Gilligan, C. K., Lala, H., Lemasle, B., Magurno, D., Marengo, M., Marinoni, S., Marrese, P. M., Martìnez-Vàzquez, C. E., Matsunaga, N., Monelli, M., Mullen, J. P., Neeley, J., Nonino, M., Prudil, Z., Salaris, M, Stetson, P. B., Valenti, E., Zoccali, M.
We discuss the largest and most homogeneous spectroscopic dataset of field RR Lyrae variables (RRLs) available to date. We estimated abundances using both high-resolution and low-resolution ({\Delta S} method) spectra for fundamental (RRab) and first
Externí odkaz:
http://arxiv.org/abs/2107.00919
Autor:
Braga, V. F., Crestani, J., Fabrizio, M., Bono, G., Preston, G. W., Sneden, C., Storm, J., Kamann, S., Latour, M., Lala, H., Lemasle, B., Prudil, Z., Altavilla, G., Chaboyer, B., Dall'Ora, M., Ferraro, I., Gilligan, C. K., Fiorentino, G., Iannicola, G., Inno, L., Kwak, S., Marengo, M., Marinoni, S., Marrese, P. M., Martínez-Vázquez, C. E., Monelli, M., Mullen, J. P., Matsunaga, N., Neeley, J., Stetson, P. B., Valenti, E., Zoccali, M.
We collected the largest spectroscopic catalog of RR Lyrae (RRLs) including $\approx$20,000 high-, medium- and low-resolution spectra for $\approx$10,000 RRLs. We provide the analytical forms of radial velocity curve (RVC) templates. These were built
Externí odkaz:
http://arxiv.org/abs/2107.00923
Autor:
Crestani, J., Braga, V. F., Fabrizio, M., Bono, G., Sneden, C., Preston, G. W., Ferraro, I., Iannicola, G., Nonino, M., Fiorentino, G., Thévenin, F., Lemasle, B., Prudil, Z., Alves-Brito, A., Altavilla, G., Chaboyer, B., Dall'Ora, M., D'Orazi, V., Gilligan, C. K., Grebel, E., Koch-Hansen, A. J., Lala, H., Marengo, M., Marinoni, S., Marrese, P. M., Martínez-Vázquez, C. E., Matsunaga, N., Monelli, M., Mullen, J. P., Neeley, J., da Silva, R., Stetson, P. B., Salaris, M., Storm, J., Valenti, E., Zoccali, M.
We provide the largest and most homogeneous sample of $\alpha$-element (Mg, Ca, Ti) and iron abundances for field RR Lyrae (RRLs, 162 variables) by using high-resolution spectra. The current measurements were complemented with similar abundances avai
Externí odkaz:
http://arxiv.org/abs/2104.08113
Autor:
Crestani, J., Fabrizio, M., Braga, V. F., Sneden, C., Preston, G. W., Ferraro, I., Iannicola, G., Bono, G., Alves-Brito, A., Nonino, M., D'Orazi, V., Inno, L., Monelli, M., Storm, J., Altavilla, G., Chaboyer, B., Dall'Ora, M., Fiorentino, G., Gilligan, C. K., Grebel, E., Lala, H., Lemasle, B., Marengo, M., Marinoni, S., Marrese, P. M., Martínez-Vázquez, C. E., Matsunaga, N., Mullen, J. P., Neeley, J., Prudil, Z., da Silva, R., Stetson, P. B., Thévenin, F., Valenti, E., Walker, A. R., Zoccali, M.
We performed the largest and most homogeneous spectroscopic survey of field RR Lyraes (RRLs). We secured $\approx$6,300 high resolution (HR, R$\sim$35,000) spectra for 143 RRLs (111 fundamental, RRab; 32 first overtone, RRc). The atmospheric paramete
Externí odkaz:
http://arxiv.org/abs/2012.02284
Autor:
Bono, G., Braga, V. F., Crestani, J., Fabrizio, M., Sneden, C., Marconi, M., Preston, G. W., Mullen, J. P., Gilligan, C. K., Fiorentino, G., Pietrinferni, A., Altavilla, G., Buonanno, R., Chaboyer, B., da Silva, R., Dall'Ora, M., Degl'Innocenti, S., Di Carlo, E., Ferraro, I., Grebel, E., Iannicola, G., Inno, L., Kovtyukh, V., Kunder, A., Lemasle, B., Marengo, M., Marinoni, S., Marrese, P. M., Martínez-Vázquez, C. E., Matsunaga, N., Monelli, M., Neeley, J., Nonino, M., Moroni, P. G. Prada, Prudil, Z., Stetson, P. B., Thévenin, F., Tognelli, E., Valenti, E., Walker, A. R.
We collected over 6000 high-resolution spectra of four dozen field RR Lyrae (RRL) variables pulsating either in the fundamental (39 RRab) or in the first overtone (9 RRc) mode. We measured radial velocities (RVs) of four strong metallic and four Balm
Externí odkaz:
http://arxiv.org/abs/2005.11566
Autor:
Fabrizio, M., Bono, G., Braga, V. F., Magurno, D., Marinoni, S., Marrese, P. M., Ferraro, I., Fiorentino, G., Giuffrida, G., Iannicola, G., Monelli, M., Altavilla, G., Chaboyer, B., Dall'Ora, M., Gilligan, C. K., Layden, A., Marengo, M., Nonino, M., Preston, G. W., Sesar, B., Sneden, C., Valenti, E., Thévenin, F., Zoccali, E.
We collected a large data set of field RR Lyrae stars (RRLs) by using catalogues already available in the literature and Gaia DR2. We estimated the iron abundances for a sub-sample of 2,382 fundamental RRLs ($\Delta$S method: CaIIK, H$\beta$, H$\gamm
Externí odkaz:
http://arxiv.org/abs/1908.02064
Autor:
Magurno, D., Sneden, C., Bono, G., Braga, V. F., Mateo, M., Persson, S. E., Preston, G., Thevenin, F., da Silva, R., Dall'Ora, M., Fabrizio, M., Ferraro, I., Fiorentino, G., Iannicola, G., Inno, L., Marengo, M., Marinoni, S., Marrese, P. M., Martinez-Vazquez, C. E., Matsunaga, N., Monelli, M., Neeley, J. R., Nonino, M., Walker, A. R.
We present a detailed spectroscopic analysis of RR Lyrae (RRL) variables in the globular cluster NGC 5139 (omega Cen). We collected optical (4580-5330 A), high resolution (R = 34,000), high signal-to-noise ratio (200) spectra for 113 RRLs with the mu
Externí odkaz:
http://arxiv.org/abs/1906.08550
Autor:
Andre Sieverding, Preston G. Waldrop, J. Austin Harris, W. Raphael Hix, Eric J. Lentz, Stephen W. Bruenn, O. E. Bronson Messer
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 1, p 34 (2023)
After decades, the theoretical study of core-collapse supernova explosions is moving from parameterized, spherically symmetric models to increasingly realistic multidimensional simulations. However, obtaining nucleosynthesis yields based on such mult
Externí odkaz:
https://doaj.org/article/4b06ffaaf2a8472198372d3f1f6c5dde
Autor:
Preston, G. W., Chadid, M.
We calibrate and then use the relation between equivalent width (EW) and full-width-half-maximum (FWHM) of metallic absorption lines in the spectra of RR Lyrae stars to estimate a new upper limit of Vrot sini less than or equal to 6 km/s on their axi
Externí odkaz:
http://arxiv.org/abs/1311.3824