{
  "id": "1904.08101",
  "version": "v1",
  "published": "2019-04-17T06:30:36.000Z",
  "updated": "2019-04-17T06:30:36.000Z",
  "title": "The period-luminosity relation for delta Scuti stars using Gaia DR2 parallaxes",
  "authors": [
    "Elham Ziaali",
    "Timothy R. Bedding",
    "Simon J. Murphy",
    "Timothy Van Reeth",
    "Daniel R. Hey"
  ],
  "comment": "accepted by MNRAS; 7 pages, 5 figures",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We have examined the period-luminosity (P-L) relation for delta Scuti stars using Gaia DR2 parallaxes. We included 228 stars from the catalogue of Rodriguez et al. (2000), as well as 1124 stars observed in the four-year Kepler mission. For each star we considered the dominant pulsation period, and used DR2 parallaxes and extinction corrections to determine absolute V magnitudes. Many stars fall along a sequence in the P-L relation coinciding with fundamental-mode pulsation, while others pulsate in shorter-period overtones. The latter stars tend to have higher effective temperatures, consistent with theoretical calculations. Surprisingly, we find an excess of stars lying on a ridge with periods half that of the fundamental. We suggest this may be due to a 2:1 resonance between the third or fourth overtone and the fundamental mode.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-04-17T06:30:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "delta scuti stars",
      "gaia dr2 parallaxes",
      "period-luminosity relation",
      "four-year kepler mission",
      "dominant pulsation period"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}