{
  "id": "2305.01887",
  "version": "v1",
  "published": "2023-05-03T04:33:07.000Z",
  "updated": "2023-05-03T04:33:07.000Z",
  "title": "A deep optical survey of young stars in the Carina Nebula. I. -- UBVRI photometric data and fundamental parameters",
  "authors": [
    "Hyeonoh Hur",
    "Beomdu Lim",
    "Moo-Young Chun"
  ],
  "comment": "21 pages, 20 figures, accepted for publication in Journal of the Korean Astronomical Society",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We present the deep homogeneous $UBVRI$ photometric data of 135,071 stars down to $V\\sim23$ mag and I ~ 22 mag toward the Carina Nebula. These stars are cross-matched with those from the previous surveys in the X-ray, near-infrared, and mid-infrared wavelengths as well as the Gaia Early Data Release 3 (EDR3). This master catalog allows us to select reliable members and determine the fundamental parameters distance, size, stellar density of stellar clusters in this star-forming region. We revisit the reddening toward the nebula using the optical and the near-infrared colors of early-type stars. The foreground reddening [E(B-V)_fg] is determined to be 0.35+/-0.02, and it seems to follow the standard reddening law. On the other hand, the total-to-selective extinction ratio of the intracluster medium (R_V,cl) decreases from the central region (Trumpler 14 and 16, R_V,cl ~ 4.5) to the northern region (Trumpler 15, R_V,cl ~ 3.4). It implies that the central region is more dusty than the northern region. We find that the distance modulus of the Carina Nebula to be 11.9+/-0.3 mag (d = 2.4+/-0.35 kpc) using a zero-age main-sequence fitting method, which is in good agreement with that derived from the Gaia EDR3 parallaxes. We also present the catalog of 3,331 pre-main-sequence (PMS) members and 14,974 PMS candidates down to V ~ 22 mag based on spectrophotometric properties of young stars at infrared, optical, and X-ray wavelengths. From the spatial distribution of PMS members and PMS candidates, we confirm that the member selection is very reliable down to faint stars. Our data will have a legacy value for follow-up studies with different scientific purposes.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-05-03T04:33:07.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "carina nebula",
      "ubvri photometric data",
      "deep optical survey",
      "young stars",
      "fundamental parameters"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 21,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}