Zobrazeno 1 - 10
of 244
pro vyhledávání: '"Akras, S."'
Autor:
Abraham, Z., Beaklini, P. P. B., Aleman, I., Sahai, R., Zijlstra, A., Akras, S., Gonçalves, D. R., Ueta, T.
The hydrogen recombination lines H30$\alpha$, H40$\alpha$, H42$\alpha$, H50$\beta$ and H57$\gamma$ and the underlying bremsstrahlung continuum emission were detected with ALMA in the bipolar nebula Mz3. The source was not spatially resolved, but the
Externí odkaz:
http://arxiv.org/abs/2410.11901
The acquisition of high-quality deep images of planetary nebulae (PNe) has allowed the detection of a wealth of small-scale features, which highlight the complexity of the formation history and physical processes shaping PNe. Here we present the disc
Externí odkaz:
http://arxiv.org/abs/2312.10532
Autor:
Domček, V., Santisteban, J. V. Hernández, Chiotellis, A., Boumis, P., Vink, J., Akras, S., Souropanis, D., Zhou, P., de Burgos, A.
We present the first optical study of the supernova remnant (SNR) G7.7-3.7, with the aim of determining its evolutionary phase since it has been suggested to be the remnant of SN 386 AD. We obtained narrow-band images in the filters H$\alpha$ + [NII]
Externí odkaz:
http://arxiv.org/abs/2309.01768
Many binary companions to the central stars of planetary nebulae (PNe) are found to be inflated, perhaps indicating that accretion onto the central star might occur during the PN phase. The discovery of a handful of nova eruptions and supersoft X-ray
Externí odkaz:
http://arxiv.org/abs/2302.07292
Autor:
Yuan, H. -B., Yang, L., Cruz, P., Jiménez-Esteban, F., Daflon, S., Placco, V. M., Akras, S., Alfaro, E. J., Galarza, C. Andrés, Gonçalves, D. R., Duan, F. -Q., Liu, J. -F., Laur, J., Solano, E., Fernandes, M. Borges, Cenarro, A. J., Marín-Franch, A., Varela, J., Ederoclite, A., López-Sanjuan, Carlos, Abramo, R., Alcaniz, J., Benítez, N., Bonoli, S., Cristóbal-Hornillos, D., Dupke, R. A., Hernán-Caballero, Antonio, de Oliveira, C. Mendes, Moles, M., Sodré Jr., L., Ramió, Héctor Vázquez, Taylor, K.
With a unique set of 54 overlapping narrow-band and two broader filters covering the entire optical range, the incoming Javalambre-Physics of the Accelerating Universe Astrophysical Survey (J-PAS) will provide a great opportunity for stellar physics
Externí odkaz:
http://arxiv.org/abs/2210.17133
Autor:
Spetsieri, Z. T., Boumis, P., Chiotellis, A., Akras, S., Derlopa, S., Shetye, S., Meyer, D. M. A., Bowman, D. M., Gvaramadze, V. V.
Studies on the circumstellar structures around evolved stars provide vital information on the evolution of the parent star and the properties of the local interstellar medium. In this work, we present the discovery and characterization of an optical
Externí odkaz:
http://arxiv.org/abs/2206.14806
Autor:
Souropanis, D., Chiotellis, A., Boumis, P., Chatzikos, M., Akras, S., Piersanti, L., Ruiter, A. J., Ferland, G. J.
Steadily accreting white dwarfs (WDs) are efficient sources of ionization and thus, are able to create extended ionized nebulae in their vicinity. These nebulae represent ideal tools for the detection of accreting WDs, given that in most cases the so
Externí odkaz:
http://arxiv.org/abs/2203.16647
Autor:
López-Sanjuan, C., Tremblay, P. -E., Ederoclite, A., Ramió, H. Vázquez, Cenarro, A. J., Marín-Franch, A., Varela, J., Akras, S., Guerrero, M. A., Jiménez-Esteban, F. M., de Oliveira, R. Lopes, Chies-Santos, A. L., Fernández-Ontiveros, J. A., Abramo, R., Alcaniz, J., Benítez, N., Bonoli, S., Carneiro, S., Cristóbal-Hornillos, D., Dupke, R. A., de Oliveira, C. Mendes, Moles, M., Sodré Jr., L., Taylor, K.
Publikováno v:
A&A 665, A151 (2022)
We analyze the white dwarf population in miniJPAS, the first square degree observed with 56 medium-band, 145 A in width optical filters by the Javalambre Physics of the accelerating Universe Astrophysical Survey (J-PAS), to provide a data-based forec
Externí odkaz:
http://arxiv.org/abs/2203.10615
Autor:
Akras, S., Monteiro, H., Walsh, J. R., García-Rojas, J., Aleman, I., Boffin, H., Boumis, P., Chiotellis, A., Corradi, R. M. L., Gonçalves, D. R., Gutiérrez-Soto, L. A., Jones, D., Morisset, C., Papanikolaou, X.
Integral field spectroscopy (IFS) provides a unique capability to spectroscopically study extended sources over a 2D field of view, but it also requires new techniques and tools. In this paper, we present an automatic code, Spectroscopic Analysis Too
Externí odkaz:
http://arxiv.org/abs/2203.06175
Publikováno v:
A&A 661, A124 (2022)
We report the discovery and characterization of a new symbiotic star of the accreting-only variety, which we observed in the optical/near-infrared (NIR) with VLT/X-Shooter and in the X-rays/ultraviolet with Swift/UVOT+XRT. The new symbiotic star, THA
Externí odkaz:
http://arxiv.org/abs/2203.05453