{
  "id": "2012.06100",
  "version": "v2",
  "published": "2020-12-11T03:44:48.000Z",
  "updated": "2021-03-22T08:04:00.000Z",
  "title": "The $UBV$ Color Evolution of Classical Novae. IV. Time-Stretched $(U-B)_0$-$(M_B-2.5\\log f_{\\rm s})$ and $(V-I)_0$-$(M_I-2.5\\log f_{\\rm s})$ Color-Magnitude Diagrams of Novae in Outburst",
  "authors": [
    "Izumi Hachisu",
    "Mariko Kato"
  ],
  "comment": "211 pages, 178 figures, typos corrected, published in ApJS, 253, 27 (2021). arXiv admin note: text overlap with arXiv:1905.10655",
  "journal": "ApJS, 253, 27 (2021)",
  "doi": "10.3847/1538-4365/abd31e",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Light curves and color evolutions of two classical novae can be largely overlapped if we properly squeeze or stretch the timescale of a target nova against that of a template nova by $t'=t/f_{\\rm s}$. Then the brightness of the target nova is related to the brightness of the template nova by $(M[t])_{\\rm template} = (M[t/f_{\\rm s}] - 2.5 \\log f_{\\rm s})_{\\rm target}$, where $M[t]$ is the absolute magnitude and a function of time $t$, and $f_{\\rm s}$ is the ratio of timescales between the target and template novae. In the previous papers of this series, we show that many novae broadly overlap in the time-stretched $(B-V)_0$-$(M_V-2.5 \\log f_{\\rm s})$ color-magnitude diagram. In the present paper, we propose two other $(U-B)_0$-$(M_B-2.5\\log f_{\\rm s})$ and $(V-I)_0$-$(M_I-2.5\\log f_{\\rm s})$ diagrams, and show that their tracks overlap for 16 novae and for 52 novae, respectively. Here, $(U-B)_0$, $(B-V)_0$, and $(V-I)_0$ are the intrinsic $U-B$, $B-V$, and $V-I$ colors and not changed by the time-stretch, and $M_B$, $M_V$, and $M_I$ are the absolute $B$, $V$, and $I$ magnitudes. Using these properties, we considerably refine the previous estimates of their distance and reddening. The obtained distances are in reasonable agreement with those of {\\it Gaia} Data Release 2 catalogue.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2021-03-22T08:04:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "color-magnitude diagram",
      "color evolution",
      "classical novae",
      "template nova",
      "target nova"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 211,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}