MACHO 311.37557.169: A VY Scl star

Hauke Wörpel, Axel D. Schwope, Iris Traulsen, Michael J.I. Brown

Research output: Contribution to journalArticleResearchpeer-review


Optical surveys, such as the MACHO project, often uncover variable stars whose classification requires follow-up observations by other instruments. We performed X-ray spectroscopy and photometry of the unusual variable star MACHO 311.37557.169 with XMM-Newton in April 2018, supplemented by archival X-ray and optical spectrographic data. The star has a bolometric X-ray luminosity of about 1 × 1032 erg s−1 cm−2 and a heavily absorbed two-temperature plasma spectrum. The shape of its light curve, its overall brightness, its X-ray spectrum, and the emission lines in its optical spectrum suggest that it is most likely a VY Scl cataclysmic variable.

Original languageEnglish
Pages (from-to)283-290
Number of pages8
JournalAstronomische Nachrichten
Issue number3
Publication statusPublished - Mar 2020


  • stars: Cataclysmic variables
  • stars: Close binaries
  • X-rays: Binaries

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