A search for open cluster Cepheids in the Galactic plane

Xiaodian Chen*, Richard de Grijs, Licai Deng

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We analyse all potential combinations of Galactic Cepheids and open clusters (OCs) in the most up-to-date catalogues available. Isochrone fitting and proper-motion calculation are applied to all potential OC-Cepheid combinations. Five selection criteria are used to select possible OC Cepheids: (i) the Cepheid of interest must be located within 60 arcmin of the OC's centre; (ii) the Cepheid's proper motion is located within the 1σ distribution of that of its host OC; (iii) the Cepheid is located in the instability strip of its postulated host OC; (iv) the Cepheid and OC distance moduli should differ by less than 1 mag; and (v) the Cepheid and OC ages (and, where available, theirmetallicities) should be comparable:Δlog (t yr-1) < 0.3. 19 possible OC Cepheids are found based on our near-infrared (NIR) analysis; eight additional OC-Cepheid associations may be genuine pairs for which we lack NIR data. Six of the Cepheids analysed at NIR wavelengths are new, high-probability OC Cepheids, since they lie on the NIR period (P)-luminosity relation (PLR). These objects include TY Sct and CN Sct in Dolidze 34, XX Sgr in Dolidze 52, CK Sct in NGC 6683, VY Car in ASCC 61 and U Car in Feinstein 1. Two additional new OC Cepheids lack NIR data: V0520 Cyg in NGC 6991 and CS Mon in Juchert 18. The NIR PLR for our confirmed sample of OC Cepheids is MJ = (-3.12 � 0.29)log (Pd-1) - (2.17 � 0.29) mag, which is in good agreement with the best NIR PLR available for all Galactic Cepheids.

Original languageEnglish
Pages (from-to)1268-1282
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume446
Issue number2
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • distance scale
  • methods: data analysis
  • open clusters and associations: general
  • stars: variables: Cepheids

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