Examinando por Autor "Sowicka, P."

Mostrando 1 - 2 de 2

Acceso Abierto
The first view of δ Scuti and γ Doradus stars with the TESS mission
(Oxford Academics: Oxford University Press, 2019-10-07) Antoci, V.; Cunha, M. S.; Bowman, D. M.; Murphy, S. J.; Kurtz, D. W.; Bedding, T. R.; Borre, C. C.; Christophe, S.; Daszyńska-Daszkiewicz, J.; Fox Machado, L.; García Hernández, A.; Ghasemi, H.; Handberg, R.; Hansen, H.; Hasanzadeh, A.; Houdek, G.; Johnston, C.; Justesen, A. B.; Kahraman Alicavus, F.; Kotysz, K.; Latham, D.; Matthews, J. M.; Monster, J.; Niemczura, E.; Paunzen, E.; Sánchez Arias, J. P.; Pigulski, A.; Pepper, J.; Richey Yowell, T.; Safari, H.; Seager, S.; Smalley, B.; Shutt, T.; Sódor, A.; Suárez, J. C.; Tkachenko, A.; Wu, T.; Zwintz, K.; Barceló Forteza, S.; Brunsden, E.; Bognár, Z.; Buzasi, D. L.; Chowdhury, S.; De Cat, P.; Evans, J. A.; Guo, Z.; Guzik, J. A.; Jetvic, N.; Lampens, P.; Lares Martiz, M.; Lovekin, C.; Li, G.; Mirouh, G. M.; Mkrtichian, D.; Monteiro, M. J. P. F. G.; Nemec, J. M.; Ouazzani, R. M.; Pascual Granado, J.; Reese, D. R.; Rieutord, M.; Rodon, J. R.; Skarka, M.; Sowicka, P.; Stateva, I.; Szabó, R.; Weiss, W. W.; Universidad Nacional Autónoma de México (UNAM); Agence Nationale de la Recherche (ANR); National Natural Science Foundation of China (NSFC); Danish National Research Foundation (DNRF); National Aeronautics and Space Administration (NASA); Fundacao para a Ciencia e a Tecnologia (FCT); National Science Centre, Poland (NCN); Hungarian Academy of Sciences (MTA); European Research Council (ERC); Ministerio de Economía y Competitividad (MINECO); Research Foundation Flanders (FWO); BELgian federal Science Policy Office (BELSPO); Science and Technology Facilities Council (STFC); Johnston, C. [0000-0002-3054-4135]; Granado, J. P. [0000-0003-0139-6951]; Monteiro, M. J. P. F. G. [0000-0003-0513-8116]; Szabo, R. [0000-0002-3258-1909]; Browman, D. [0000-0001-7402-3852]; Safari, H. [0000-0003-2326-3201]; Simon, M. [0000-0002-5648-3107]; Houdek, G. [0000-0003-1819-810X]; Ghasemi, H. [0000-0001-9534-9763]; Handerberg, R. [0000-0001-8725-4502]; Borre, C. C. [0000-0003-1286-8512]; Cunha, M. [0000-0001-8237-7343]; Justensen, A. B. [0000-0002-0174-2466]; Antoci, V. [0000-0002-0865-3650]; Christophe, S. [0000-0002-4153-870X]; Centros de Excelencia Severo Ochoa, INSTITUTO DE ASTROFISICA DE ANDALUCIA (IAA), SEV-2017-0709; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
We present the first asteroseismic results for δ Scuti and γ Doradus stars observed in Sectors 1 and 2 of the TESS mission. We utilize the 2-min cadence TESS data for a sample of 117 stars to classify their behaviour regarding variability and place them in the Hertzsprung–Russell diagram using Gaia DR2 data. Included within our sample are the eponymous members of two pulsator classes, γ Doradus and SX Phoenicis. Our sample of pulsating intermediate-mass stars observed by TESS also allows us to confront theoretical models of pulsation driving in the classical instability strip for the first time and show that mixing processes in the outer envelope play an important role. We derive an empirical estimate of 74 per cent for the relative amplitude suppression factor as a result of the redder TESS passband compared to the Kepler mission using a pulsating eclipsing binary system. Furthermore, our sample contains many high-frequency pulsators, allowing us to probe the frequency variability of hot young δ Scuti stars, which were lacking in the Kepler mission data set, and identify promising targets for future asteroseismic modelling. The TESS data also allow us to refine the stellar parameters of SX Phoenicis, which is believed to be a blue straggler.
Restringido
The post-common-envelope binary central star of the planetary nebula ETHOS 1
(Oxford Academics: Oxford University Press, 2020-09-11) Munday, J.; Jones, David; García Rojas, J.; Boffin, H. M. J.; Miszalski, B.; Corradi, R. L. M.; Rodríguez Gil, P.; Rubio Díez, M. M.; Santander García, M.; Sowicka, P.; National Science Centre, Poland (NCN); Agencia Estatal de Investigación (AEI); 0000-0002-1872-5398; 0000-0003-3947-5946; 0000-0002-6138-1869; 0000-0002-9486-4840; 0000-0003-2561-6306; 0000-0002-6605-0268; Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737
We present a detailed study of the binary central star of the planetary nebula ETHOS 1 (PN G068.1+11.0). Simultaneous modelling of light and radial velocity curves reveals the binary to comprise a hot and massive pre-white dwarf with an M-type main-sequence companion. A good fit to the observations was found with a companion that follows expected mass–temperature–radius relationships for low-mass stars, indicating that despite being highly irradiated, it is consistent with not being significantly hotter or larger than a typical star of the same mass. Previous modelling indicated that ETHOS 1 may comprise the first case where the orbital plane of the central binary does not lie perpendicular to the nebular symmetry axis, at odds with the expectation that the common envelope is ejected in the orbital plane. We find no evidence for such a discrepancy, deriving a binary inclination in agreement with that of the nebula as determined by spatio-kinematic modelling. This makes ETHOS 1 the ninth post-common-envelope planetary nebula in which the binary orbital and nebular symmetry axes have been shown to be aligned, with as yet no known counter-examples. The probability of finding such a correlation by chance is now less than 0.000 02 per cent.