| Texto completo | |
| Autor(es): Mostrar menos - |
Pala, A. F.
;
Gansicke, B. T.
;
Belloni, D.
;
Parsons, S. G.
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Marsh, T. R.
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Schreiber, M. R.
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Breedt, E.
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Knigge, C.
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Sion, E. M.
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Szkody, P.
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Townsley, D.
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Bildsten, L.
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Boyd, D.
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Cook, M. J.
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De Martino, D.
;
Godon, P.
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Kafka, S.
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Kouprianov, V
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Long, K. S.
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Monard, B.
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Myers, G.
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Nelson, P.
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Nogami, D.
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Oksanen, A.
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Pickard, R.
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Poyner, G.
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Reichart, D. E.
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Perez, D. Rodriguez
;
Shears, J.
;
Stubbings, R.
;
Toloza, O.
Número total de Autores: 31
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| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 510, n. 4, p. 23-pg., 2022-02-01. |
| Resumo | |
We report on the masses (M-WD), effective temperatures (T-eff), and secular mean accretion rates (< M >) of 43 cataclysmic variable (CV) white dwarfs, 42 of which were obtained from the combined analysis of their Hubble Space Telescope ultraviolet data with the parallaxes provided by the Early Third Data Release of the Gaia space mission, and one from the white dwarf gravitational redshift. Our results double the number of CV white dwarfs with an accurate mass measurement, bringing the total census to 89 systems. From the study of the mass distribution, we derive < M-WD > = 0.81(-0.20)(+0.16) M-circle dot, in perfect agreement with previous results, and find no evidence of any evolution of the mass with orbital period. Moreover, we identify five systems with M-WD < 0.5 M-circle dot, which are most likely representative of helium-core white dwarfs, showing that these CVs are present in the overall population. We reveal the presence of an anticorrelation between the average accretion rates and the white dwarf masses for the systems below the 2-3 h period gap. Since <(M) over dot > reflects the rate of system angular momentum loss, this correlation suggests the presence of an additional mechanism of angular momentum loss that is more efficient at low white dwarf masses. This is the fundamental concept of the recently proposed empirical prescription of consequential angular momentum loss (eCAML) and our results provide observational support for it, although we also highlight how its current recipe needs to be refined to better reproduce the observed scatter in T-eff and <(M) over dot >, and the presence of helium-core white dwarfs. (AU) | |
| Processo FAPESP: | 17/14289-3 - Variáveis cataclísmicas magnéticas: evolução secular com o código BSE e modelagem de emissão com o código CYCLOPS |
| Beneficiário: | Diogo Teixeira Belloni |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |