{
  "id": "2205.15916",
  "version": "v1",
  "published": "2022-05-31T16:04:05.000Z",
  "updated": "2022-05-31T16:04:05.000Z",
  "title": "LTD064402+245919, compact binary or subgiant with red star eclipsing binary?",
  "authors": [
    "Jincheng Guo",
    "Cheng Liu"
  ],
  "comment": "Accepted for publication in RNAAS",
  "categories": [
    "astro-ph.SR",
    "astro-ph.HE"
  ],
  "abstract": "Recently, a single-line spectroscopic binary, LTD064402+245919, has been discovered by Yang et al. Using data from LAMOST and ZTF, the unseen companion is estimated to have a mass of 1-3 $M_{\\odot}$, orbiting a subgiant with orbital period of 14.50 days, making it a good compact binary candidate without X-ray emission. However, new light curves from ZTF and ASAS-SN, have shown the depth of one dip increases towards a bluer wavelength, indicating LTD064402+245919 is more likely to be a subgiant with a red star. Using both Wilson-Devinney code and Phoebe, the derived $T_{eff}$ of secondary is about 3400 K, corresponding to a red M2/3 star. Additionally, the 20% error of parallax from Gaia is large. The mass of subgiant will be 1.28 $M_{\\odot}$ instead of 2.77 $M_{\\odot}$, if the refined distance of 5.0kpc is used. Nevertheless, new multi-colour photometry are warranted for the final confirmation of binary properties.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2022-05-31T16:04:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "red star eclipsing binary",
      "single-line spectroscopic binary",
      "compact binary candidate",
      "final confirmation",
      "multi-colour photometry"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}