Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Monroe, Talawanda"'
Autor:
Proffitt, Charles R., Jin, Harim, Daflon, Simone, Lennon, Daniel J., Langer, Norbert, Cunha, Katia, Monroe, Talawanda
New boron abundances or upper limits have been determined for 8 early-B stars in the young Galactic open cluster NGC 3293, using ultraviolet spectra obtained by the Hubble Space Telescope Cosmic Origins Spectrograph. With previous observations, there
Externí odkaz:
http://arxiv.org/abs/2401.12918
We used the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope (HST) to observe the semi-forbidden CIII] emission in Green Pea galaxies at 0.13 < z < 0.3. We detect CIII] emission in 7/10 galaxies with CIII] equivalent widths t
Externí odkaz:
http://arxiv.org/abs/2005.05399
Publikováno v:
Mon.Not.Roy.Astron.Soc. 482 (2019) 3288-3307
Quasars whose broad emission lines show temporal, bulk radial velocity (RV) shifts have been proposed as candidate sub-parsec (sub-pc), binary supermassive black holes (BSBHs). We identified a sample of 16 BSBH candidates based on two-epoch spectrosc
Externí odkaz:
http://arxiv.org/abs/1809.04610
Autor:
Bedell, Megan, Bean, Jacob L., Melendez, Jorge, Spina, Lorenzo, Ramirez, Ivan, Asplund, Martin, Alves-Brito, Alan, Santos, Leonardo dos, Dreizler, Stefan, Yong, David, Monroe, TalaWanda, Casagrande, Luca
The compositions of stars are a critical diagnostic tool for many topics in astronomy such as the evolution of our Galaxy, the formation of planets, and the uniqueness of the Sun. Previous spectroscopic measurements indicate a large intrinsic variati
Externí odkaz:
http://arxiv.org/abs/1802.02576
Autor:
Melendez, Jorge, Bedell, Megan, Bean, Jacob L., Ramirez, Ivan, Asplund, Martin, Dreizler, Stefan, Yan, Hong-Liang, Shi, Jian-Rong, Lind, Karin, Ferraz-Mello, Sylvio, Galarza, Jhon Yana, Santos, Leonardo dos, Spina, Lorenzo, Maia, Marcelo Tucci, Alves-Brito, Alan, Monroe, TalaWanda, Casagrande, Luca
[Methods]. We obtained high-precision radial velocities with HARPS on the ESO 3.6 m telescope and determined precise stellar elemental abundances (~0.01 dex) using MIKE spectra on the Magellan 6.5m telescope. [Results]. Our data indicate the presence
Externí odkaz:
http://arxiv.org/abs/1610.09067
Autor:
Monroe, TalaWanda R., Prochaska, J. Xavier, Tejos, N., Worseck, G., Hennawi, Joseph F., Schmidt, Tobias, Tumlinson, Jason, Shen, Yue
We present the first data release (DR1) from our UV-bright Quasar Survey (UVQS) for new $z \sim 1$ active galactic nuclei (AGN) across the sky. Using simple GALEX UV and WISE near-IR color selection criteria, we generated a list of 1450 primary candi
Externí odkaz:
http://arxiv.org/abs/1602.06255
Publikováno v:
Pub. ASP, 128, 024201, 2016
An incidental spectrum of the poorly studied long period variable EF Aquilae shows [O III] emission indicative of a symbiotic star. Strong GALEX detections in the UV reinforce this classification, providing overt evidence for the presence of the hot
Externí odkaz:
http://arxiv.org/abs/1512.04075
Autor:
Melendez, Jorge, Schirbel, Lucas, Monroe, TalaWanda R., Yong, David, Ramirez, Ivan, Asplund, Martin
[Context]. The standard solar model fails to predict the very low lithium abundance in the Sun, which is much lower than the proto-solar nebula. This Li problem has been debated for decades, and it has been ascribed either to planet formation or to s
Externí odkaz:
http://arxiv.org/abs/1406.2385
Autor:
Monroe, TalaWanda R., Meléndez, Jorge, Ramírez, Iván, Yong, David, Bergemann, Maria, Asplund, Martin, Bean, Jacob, Bedell, Megan, Maia, Marcelo Tucci, Lind, Karin, Alves-Brito, Alan, Casagrande, Luca, Castro, Matthieu, Nascimento, José-Dias do, Bazot, Michael, Freitas, Fabrício C.
We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with precisions as high as 0.004 dex ($\lesssim$1%), using ultra high-resolution
Externí odkaz:
http://arxiv.org/abs/1308.5744
We present a moderate-resolution spectroscopic analysis of the 10-25 Myr clusters NGC 7160 and NGC 2232, using observations obtained with the WIYN 3.5-m telescope. Both NGC 7160 and NGC 2232 are found to have super-solar metallicities, with a mean [F
Externí odkaz:
http://arxiv.org/abs/1010.0739