The Orbit and Mass of the Cepheid AW Per
No Thumbnail Available
Date
2024-09
Profesor/a GuÃa
Facultad/escuela
Idioma
en
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Physics
Nombre de Curso
item.page.dc.rights
CC BY 4.0 Attribution 4.0 International
item.page.dc.rights
https://creativecommons.org/licenses/by/4.0/
Abstract
The Cepheid AW Per is a component in a multiple system with a long-period orbit. The radial velocities of Griffin cover the 38 yr orbit well. An extensive program of interferometry with the Center for High Angular Resolution Astronomy array is reported here, from which the long-period orbit is determined. In addition, a Hubble Space Telescope high-resolution spectrum in the ultraviolet demonstrates that the companion is itself a binary with nearly equal-mass components. These data combined with a distance from Gaia provide a mass of the Cepheid (primary) of M 1 = 6.79 ± 0.85 M ⊙. The combined mass of the secondary is M S = 8.79 ± 0.50 M ⊙. The accuracy of the mass will be improved after the fourth Gaia data release, expected in approximately two years.
item.page.dc.description
Indexación: Scopus.
Keywords
Astrophysical Journal Open Access Volume 972, Issue 21 September 2024 Article number 145
Citation
Astrophysical Journal Open Access Volume 972, Issue 21 September 2024 Article number 145
DOI
10.3847/1538-4357/ad5e7d