{
  "id": "1501.00863",
  "version": "v1",
  "published": "2015-01-05T13:47:53.000Z",
  "updated": "2015-01-05T13:47:53.000Z",
  "title": "Classifying the secondary component of the binary star W Aquilae",
  "authors": [
    "T. Danilovich",
    "G. Olofsson",
    "J. H. Black",
    "K. Justtanont",
    "H. Olofsson"
  ],
  "comment": "5 pages, 1 figure, research note",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "AIMS: The object W Aql is an asymptotic giant branch (AGB) star with a faint companion. By determining more carefully the properties of the companion, we hope to better constrain the properties of the AGB star. METHODS: We present new spectral observations of the binary star W Aql at minimum and maximum brightness and new photometric observations of W Aql at minimum brightness. RESULTS: The composite spectrum near minimum light is predominantly from the companion at wavelengths $\\lambda$ < 6000 $\\AA$. This spectrum can be classified as F8 to G0, and the brightness of the companion is that of a dwarf star. Therefore, it can be concluded that the companion is a main sequence star. From this, we are able to constrain the mass of the AGB component to 1.04 - 3 $M_\\odot$ and the mass of the W Aql system to 2.1 - 4.1 $M_\\odot$ . Our photometric results are broadly consistent with this classification and suggest that the main sequence component suffers from approximately 2 mag of extinction in the V band primarily due to the dust surrounding the AGB component.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-01-05T13:47:53.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "binary star",
      "secondary component",
      "main sequence component suffers",
      "agb component",
      "asymptotic giant branch"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}