Infrared variable stars in the compact elliptical galaxy M32

O. C. Jones, C. Nally, M. J. Sharp, I. McDonald, M. L. Boyer, M. Meixner, F. Kemper, A. M. N. Ferguson, S. R. Goldman, R. M. Rich

Research output: Contribution to journalArticlepeer-review


Variable stars in the compact elliptical galaxy M32 are identified, using three epochs of photometry from the Spitzer Space Telescope at 3.6 and 4.5 μm, separated by 32 to 381 d. We present a high-fidelity catalogue of sources detected in multiple epochs at both 3.6 and 4.5 μm, which we analysed for stellar variability using a joint probability error-weighted flux difference. Of these, 83 stars are identified as candidate large-amplitude, long-period variables, with 28 considered high-confidence variables. The majority of the variable stars are classified as asymptotic giant branch star candidates using colour-magnitude diagrams. We find no evidence supporting a younger, infrared-bright stellar population in our M32 field.
Original languageEnglish
Pages (from-to)565-575
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Early online date5 Apr 2021
Publication statusPublished - 1 Jun 2021


  • astro-ph.SR
  • astro-ph.GA


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