The Orbit and Mass of the Cepheid AW Per <sup>∗</sup>
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.
Authors
- Cyprien Lanthermann (ORCID: https://orcid.org/0000-0001-9745-5834)
- Elaine Winston (ORCID: https://orcid.org/0000-0001-9065-6633)
- Charles Proffitt (ORCID: https://orcid.org/0000-0001-7617-5665)
- Gail H. Schaefer (ORCID: https://orcid.org/0000-0001-5415-9189)
- Mayra Gutierrez (ORCID: https://orcid.org/0009-0006-0225-4444)
- John D. Monnier (ORCID: https://orcid.org/0000-0002-3380-3307)
- Rachael M. Roettenbacher (ORCID: https://orcid.org/0000-0002-9288-3482)
- Benjamin R. Setterholm (ORCID: https://orcid.org/0000-0001-5980-0246)
- Richard I. Anderson (ORCID: https://orcid.org/0000-0001-8089-4419)
- Joanna Kuraszkiewicz (ORCID: https://orcid.org/0000-0001-5513-029X)
- Stefan Kraus (ORCID: https://orcid.org/0000-0001-6017-8773)
- Hans Moritz Günther (ORCID: https://orcid.org/0000-0003-4243-2840)
- Narsireddy Anugu (ORCID: https://orcid.org/0000-0002-2208-6541)
- A. Mérand (ORCID: https://orcid.org/0000-0003-2125-0183)
- Nancy Remage Evans (ORCID: https://orcid.org/0000-0002-4374-075X)
- A. Gallenne (ORCID: https://orcid.org/0000-0001-7853-4094)
- Noura Ibrahim (ORCID: https://orcid.org/0000-0002-1788-9366)
- P. Kervella (ORCID: https://orcid.org/0000-0003-0626-1749)
- W. Gieren (ORCID: https://orcid.org/0000-0003-1405-9954)
- Grzegorz Pietrzynski
Institutions
- Centre National de la Recherche Scientifique (FR)
- Space Telescope Science Institute (US)
- European Southern Observatory (DE)
- Universidad Andrés Bello (CL)
- Smithsonian Astrophysical Observatory (US)
- University of Concepción (CL)
- Georgia State University (US)
- Université Paris Cité (FR)
- University of Exeter (GB)
- Université Paris Sciences et Lettres (FR)
- University of Michigan (US)
- Observatoire de Paris (FR)
- Sorbonne Université (FR)
- Chinese Academy of Science South America Center for Astronomy (CL)
- Max Planck Institute for Astronomy (DE)
- Laboratoire d’études spatiales et d’instrumentation en astrophysique (FR)
- Mount Wilson Observatory (US)
- École Polytechnique Fédérale de Lausanne (CH)
- Massachusetts Institute of Technology (US)
Publication Details
- Journal
- The Astrophysical Journal
- Published
- 2024-09-01
- DOI
- https://doi.org/10.3847/1538-4357/ad5e7d
- Citations
- 3
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 0.99
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