The Astrophysical Journal (Jan 2024)
The Orbit and Mass of the Cepheid AW Per
- 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
Affiliations
- Nancy Remage Evans
- ORCiD
- Smithsonian Astrophysical Observatory , MS 4, 60 Garden St., Cambridge, MA 02138, USA ; [email protected]
- Alexandre Gallenne
- ORCiD
- Instituto de Astrofísica, Departamento de Ciencias Físicas, Facultad de Ciencias Exactas, Universidad Andrés Bello , Fernández Concha 700, Las Condes, Santiago, Chile; French-Chilean Laboratory for Astronomy , IRL 3386, CNRS, Casilla 36-D, Santiago, Chile
- Pierre Kervella
- ORCiD
- LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris , 5 Place Jules Janssen, 92195 Meudon, France
- Antoine Mérand
- European Southern Observatory , Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
- John Monnier
- ORCiD
- Department of Astronomy, University of Michigan , 1085 S. University, Ann Arbor, MI 48109, USA
- Richard I Anderson
- ORCiD
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL) , Observatoire de Sauverny, 1290 Versoix, Switzerland
- H. Moritz Günther
- Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , 77 Massachusetts Ave., NE83-569, Cambridge, MA 02139, USA
- Charles Proffitt
- ORCiD
- Space Telescope Science Institute , 3700 San Martin Dr., Baltimore, MD 21218, USA
- Elaine M. Winston
- Smithsonian Astrophysical Observatory , MS 4, 60 Garden St., Cambridge, MA 02138, USA
- Grzegorz Pietrzynski
- Departamento de Astronomia, Universidad de Concepcion , Casilla160-C, Concepcion, Chile
- Wolfgang Gieren
- ORCiD
- Departamento de Astronomia, Universidad de Concepcion , Casilla160-C, Concepcion, Chile
- Joanna Kuraszkiewicz
- ORCiD
- Smithsonian Astrophysical Observatory , MS 67, 60 Garden St., Cambridge, MA 02138, USA
- Narsireddy Anugu
- ORCiD
- CHARA Array of the Georgia State University , Mount Wilson, CA 91023, USA
- Rachael M. Roettenbacher
- ORCiD
- Department of Astronomy, University of Michigan , 1085 S. University, Ann Arbor, MI 48109, USA
- Cyprien Lanthermann
- CHARA Array of the Georgia State University , Mount Wilson, CA 91023, USA
- Mayra Gutierrez
- Department of Astronomy, University of Michigan , 1085 S. University, Ann Arbor, MI 48109, USA; CHARA Array of the Georgia State University , Mount Wilson, CA 91023, USA
- Gail Schaefer
- CHARA Array of the Georgia State University , Mount Wilson, CA 91023, USA
- Benjamin R. Setterholm
- ORCiD
- Max-Planck-Institut für Astronomie , Königstuhl 17, 69117 Heidelberg, Germany
- Noura Ibrahim
- Department of Astronomy, University of Michigan , 1085 S. University, Ann Arbor, MI 48109, USA
- Stefan Kraus
- ORCiD
- School of Physics and Astronomy, Astrophysics Group, University of Exeter , Stocker Road, Exeter, EX4 4QL, UK
- DOI
- https://doi.org/10.3847/1538-4357/ad5e7d
- Journal volume & issue
-
Vol. 972,
no. 2
p. 145
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.
Keywords
