Year: 2024
Type: article
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.
Source: The Astrophysical Journal
Authors: Nancy Remage Evans, Alexandre Gallenne, Pierre Kervella, Antoine Mérand, John Monnier, Richard I Anderson, H. Moritz Günther, Charles Proffitt, Elaine M. Winston, Grzegorz Pietrzynski, Wolfgang Gieren, Joanna Kuraszkiewicz, Narsireddy Anugu, Rachael M. Roettenbacher, Cyprien Lanthermann, Mayra Gutierrez, Gail Schaefer, Benjamin R. Setterholm, Noura Ibrahim, Stefan Kraus
Institutions: Smithsonian Astrophysical Observatory, Universidad Andrés Bello, Centre National de la Recherche Scientifique, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Laboratoire d’études spatiales et d’instrumentation en astrophysique, European Southern Observatory, University of Michigan, École Polytechnique Fédérale de Lausanne, Massachusetts Institute of Technology, Space Telescope Science Institute, University of Concepción, Georgia State University, Max Planck Institute for Astronomy, University of Exeter
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Funders: National Science Foundation, National Aeronautics and Space Administration, Georgia State University, Space Telescope Science Institute, Heising-Simons Foundation, European Space Agency, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Agencia Nacional de Investigación y Desarrollo, Office of the Vice President for Research and Economic Development, University at Buffalo, Fondo Nacional de Desarrollo Científico y Tecnológico, HORIZON EUROPE European Research Council
Awards: G1390571956, G1436170975, G2116710194, Collaborative Research: Imaging planet-forming disks around young Suns using a revolutionary infrared detector, G2733421764, THE EXOPLANET FIELD HAS REMAINED VIBRANT AND EXCITING DUE TO THE CONTINUOUS DEVELOPMENT OF NEW OBSERVING TECHNIQUES AND THE REFINEMENT OF OLDER ONES,, G3048844159, HIGH-PRECISION STELLAR MASSES AND DISTANCES FROM HIGH-ANGULAR RESOLUTION OBSERVATIONS OF BINARY SYSTEMS, Collaborative Research: First Science with the Michigan Young STar Imager at CHARA (MYSTIC), IMPROVING CEPHEID STARS AS DISTANCE INDICATORS, G3984342935, Phasenübergänge und Instabilitäten, G433322167, G434337789, G5498856803, G58316358, G612732458, G6132391133, G6153725302, G6273510985, Enabling Milliarcsecond Astrophysics: Open access for the CHARA Array, G7182325560, Measuring Hubble’s Constant to 1% With Pulsating Stars, Exploring the Milliarcsecond Frontier: Open access to the renewed CHARA Array, G8466163884, G8493109902, G955576425
OpenAlex ID: W4402201203