X-ray detection of the cluster containing the Cepheid S Mus

Nancy Remage Evans, Ignazio Pillitteri, Scott Wolk, Edward Guinan, Scott Engle, Howard E. Bond, Gail H. Schaefer, Margarita Karovska, Joseph Depasquale, Evan Tingle

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The galactic Cepheid S Muscae has recently been added to the important list of Cepheids linked to open clusters, in this case the sparse young cluster ASCC 69. Low-mass members of a young cluster are expected to have rapid rotation and X-ray activity, making X-ray emission an excellent way to discriminate them from old field stars. We have made an XMM-Newton observation centered on S Mus and identified a population of X-ray sources whose near-IR Two Micron All Sky Survey counterparts lie at locations in the J, (J-K) color-magnitude diagram consistent with cluster membership at the distance of S Mus. Their median energy and X-ray luminosity are consistent with young cluster members as distinct from field stars. These strengthen the association of S Mus with the young cluster, making it a potential Leavitt law (period-luminosity relation) calibrator.

Original languageEnglish (US)
Article numberL25
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Apr 20 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Evans, N. R., Pillitteri, I., Wolk, S., Guinan, E., Engle, S., Bond, H. E., Schaefer, G. H., Karovska, M., Depasquale, J., & Tingle, E. (2014). X-ray detection of the cluster containing the Cepheid S Mus. Astrophysical Journal Letters, 785(2), [L25]. https://doi.org/10.1088/2041-8205/785/2/L25