X-Rays in Cepheids: XMM-Newton Observations of η Aql

Journal Article · Wed Sep 01 04:00:00 EDT 2021 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/AC05CD· OSTI ID:23159349

Evans, Nancy Remage; Wolk, Scott; Moschou, Sofia; Drake, Jeremy J. ^[1]; Pillitteri, Ignazio ^[2]; Kervella, Pierre ^[3]; Engle, Scott; Guinan, Edward ^[4]; Günther, H. Moritz ^[5]; Neilson, Hilding ^[6]; Marengo, Massimo ^[7]; Matthews, Lynn D. ^[8]; Guzik, Joyce A. ^[9]; Gallenne, Alexandre; Hocdé, Vincent ^[10]; Mérand, Antoine ^[11]

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1. Smithsonian Astrophysical Observatory, MS 4, 60 Garden Street, Cambridge, MA 02138 (United States)
2. INAF-Osservatorio di Palermo, Piazza del Parlamento 1, I-90134 Palermo (Italy)
3. LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 Place Jules Janssen, F-92195 Meudon (France)
4. Department of Astronomy and Astrophysics, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085 (United States)
5. Massachusetts Institute of Technology, Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, NE83-569, Cambridge, MA 02139 (United States)
6. Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S3H4 Canada (Canada)
7. Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011 (United States)
8. Massachusetts Institute of Technology, Haystack Observatory, 99 Millstone Road, Westford, MA 01886 (United States)
9. Los Alamos National Laboratory, Box 1663, MS T-082 Los Alamos, NM 87545-2345 (United States)
10. Nicolaus Copernicus Astronomical Centre, Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa (Poland)
11. European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching (Germany)

X-ray bursts have recently been discovered in the Cepheids δ Cep and β Dor modulated by the pulsation cycle. We have obtained an observation of the Cepheid η Aql with the XMM-Newton satellite at the phase of maximum radius; the phase at which there is a burst of X-rays in δ Cep. No X-rays were seen from the Cepheid η Aql at this phase, and the implications for Cepheid upper atmospheres are discussed. We have also used the combination of X-ray sources, as well as Gaia and 2MASS data, to search for a possible grouping around the young intermediate mass Cepheid. No indication of such a group was found.

• OSTI ID: 23159349
• Journal Information: The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 3 Vol. 162; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CEPHEIDS
PULSATIONS
X RADIATION
X-RAY SOURCES