| Texto completo | |
| Autor(es): |
Takeda, L.
[1]
;
Diaz, M.
[1]
;
Campbell, R. D.
[2]
;
Lyke, J. E.
[2]
;
Lawrence, S. S.
[3]
;
Linford, J. D.
[4]
;
Sokolovsky, V, K.
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226, BR-05508900 Sao Paulo, SP - Brazil
[2] WM Keck Observ, 65-1120 Mamalahoa Highway, Kamuela, HI 96743 - USA
[3] Dept Phys & Astron, 151 Hofstra Univ, Hempstead, NY 11549 - USA
[4] Natl Radio Astron Observ, Socorro, NM 87801 - USA
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Monthly Notices of the Royal Astronomical Society; v. 511, n. 2, p. 1591-1600, FEB 8 2022. |
| Citações Web of Science: | 0 |
| Resumo | |
We present Hubble Space Telescope optical images, Keck-OSIRIS near-infrared (NIR) integral field spectroscopy data cubes and Keck-Near InfraRed Camera-2 (NIRC2) NIR images of nova V5668 Sgr from 2016 to 2019. The observations indicate enhanced emission at the polar caps and equatorial torus for low-ionization lines, and enhanced high-ionization emission lines only at the polar caps. The radial velocities are compatible with a homogeneous expansion velocity of v = 590 km s(-1) and a system inclination angle of 24 degrees. These values were used to estimate an expansion parallax distance of 1200 +/- 400 pc. The NIRC2 data indicate the presence of dust in 2016 and 2017, but no dust emission could be detected in 2019. The observational data were used for assembling 3D photoionization models of the ejecta. The model results indicate that the central source has a temperature of 1.88 x 10(5) K and a luminosity of 1.6 x 10(35) erg s(-1) in August of 2017 (2.4 yr post eruption), and that the shell has a mass of 6.3 x 10(-5) M-circle dot. The models also suggest anisotropy of the ionizing flux, possibly by the contribution from a luminous accretion disc. (AU) | |
| Processo FAPESP: | 19/08341-8 - Sobre a massa de lítio ejetada em novas: uma análise atual |
| Beneficiário: | Larissa Takeda |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |