Zobrazeno 1 - 10
of 846
pro vyhledávání: '"Urbaneja, Á."'
Autor:
Kudritzki, Rolf-Peter, Urbaneja, Miguel A., Bresolin, Fabio, Macri, Lucas M., Yuan, Wenlong, Li, Siyang, Anand, Gagandeep S., Riess, Adam G.
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [Z
Externí odkaz:
http://arxiv.org/abs/2411.07974
Publikováno v:
A&A, 687, L7 (2024)
We present a quantitative spectral analysis of the extreme nitrogen-enhanced supergiant HD 93840 (BN1 Ib) at an intermediate galactic latitude. Based on an optical high-resolution spectrum and complementary ultraviolet and infrared (spectro-)photomet
Externí odkaz:
http://arxiv.org/abs/2407.01037
Autor:
Hai, Vu Tuan, Viet, Nguyen Tan, Urbaneja, Jesus, Linh, Nguyen Vu, Tran, Lan Nguyen, Ho, Le Bin
Publikováno v:
Machine Learning: Science and Technology (2024)
Quantum compilation is the process of converting a target unitary operation into a trainable unitary represented by a quantum circuit. It has a wide range of applications, including gate optimization, quantum-assisted compiling, quantum state prepara
Externí odkaz:
http://arxiv.org/abs/2407.01010
Publikováno v:
A&A 687, L16 (2024)
The properties of blue supergiants are key for constraining the end of the main sequence (MS) of massive stars. Whether the observed drop in the relative number of fast-rotating stars below $\sim$21$\,$kK is due to enhanced mass-loss rates at the loc
Externí odkaz:
http://arxiv.org/abs/2405.09868
The IACOB project X. Large-scale quantitative spectroscopic analysis of Galactic luminous blue stars
Publikováno v:
A&A 687, A228 (2024)
Blue supergiants (BSGs) are key objects for understanding the evolution of massive stars. However, discrepancies between theoretical predictions and empirical observations have opened up important questions yet to be answered. Studying statistically
Externí odkaz:
http://arxiv.org/abs/2312.00241
Autor:
Menon, Athira, Ercolino, Andrea, Urbaneja, Miguel A., Lennon, Daniel J., Herrero, Artemio, Hirai, Ryosuke, Langer, Norbert, Schootemeijer, Abel, Chatzopoulos, Emmanouil, Frank, Juhan, Shiber, Sagiv
Blue supergiants are the brightest stars in their host galaxies and yet their evolutionary status has been a long-standing problem in stellar astrophysics. In this pioneering work, we present a large sample of 59 early B-type supergiants in the Large
Externí odkaz:
http://arxiv.org/abs/2311.05581
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope. From the quantitative analysis of seven B8-A0 stars we derive a mean metalli
Externí odkaz:
http://arxiv.org/abs/2309.11952
Publikováno v:
A&A 674, A212 (2023)
Blue supergiants (BSGs) are important objects to study the intermediate phases of massive star evolution, helping to constrain evolutionary models. However, the lack of a holistic study of a statistically significant and unbiased sample of these obje
Externí odkaz:
http://arxiv.org/abs/2305.00305
Autor:
González-Torà, Gemma, Urbaneja, Miguel A., Przybilla, Norbert, Dreizler, Stefan, Roth, Martin M., Kamann, Sebastian, Castro, Norberto
Publikováno v:
Proc. IAU 18 (2022) 151-156
We present the results obtained using spectroscopic data taken with the intermediateresolution Multi Unit Spectroscopic Explorer (MUSE) of B and A-type supergiants and bright giants in the Sculptor Group galaxy NGC 300. For our analysis, a hybrid loc
Externí odkaz:
http://arxiv.org/abs/2209.14314
We present the first quantitative spectral analysis of blue supergiant stars in the nearby galaxy NGC 2403. Out of a sample of 47 targets observed with the LRIS spectrograph at the Keck I telescope we have extracted 16 B- and A-type supergiants for w
Externí odkaz:
http://arxiv.org/abs/2209.13135