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@ARTICLE{Acharyya:618798,
      author       = {Acharyya, A. and Aufdenberg, J. P. and Bangale, P. and
                      Bartkoske, J. T. and Batista, P. and Benbow, W. and Chromey,
                      A. J. and Davis, J. D. and Feng, Q. and Foote, G. M. and
                      Furniss, A. and Hanlon, W. and Hinrichs, C. E. and Holder,
                      J. and Jin, W. and Kaaret, P. and Kertzman, M. and Kieda, D.
                      and Kleiner, T. K. and Korzoun, N. and LeBohec, T. and Lisa,
                      M. A. and Lundy, M. and Matthews, N. and McGrath, C. E and
                      Millard, M. J. and Moriarty, P. and Nikkhah, S. and
                      O’Brien, S. and Ong, R. A. and Pohl, M. and Pueschel, E.
                      and Quinn, J. and Rabinowitz, P. L. and Ragan, K. and
                      Roache, E. and Rose, J. G. and Sackrider, J. L. and Sadeh,
                      I. and Saha, L. and Sembroski, G. H. and Shang, R. and Tak,
                      D. and Ticoras, M. and Tucci, J. V. and Williams, D. A. and
                      Wong, S. L.},
      title        = {{A}n {A}ngular {D}iameter {M}easurement of β {UM}a via
                      {S}tellar {I}ntensity {I}nterferometry with the {VERITAS}
                      {O}bservatory},
      journal      = {The astrophysical journal / Part 1},
      volume       = {966},
      number       = {1},
      issn         = {0004-637X},
      address      = {London},
      publisher    = {Institute of Physics Publ.},
      reportid     = {PUBDB-2024-07159, arXiv:2401.01853},
      pages        = {28},
      year         = {2024},
      abstract     = {We use the Very Energetic Radiation Imaging telescope Array
                      System (VERITAS) imaging air Cherenkov telescope array to
                      obtain the first measured angular diameter of β UMa at
                      visual wavelengths using stellar intensity interferometry
                      (SII) and independently constrain the limb-darkened angular
                      diameter. The age of the Ursa Major moving group has been
                      assessed from the ages of its members, including nuclear
                      member Merak (β UMa), an A1-type subgiant, by comparing
                      effective temperature and luminosity constraints to model
                      stellar evolution tracks. Previous interferometric
                      limb-darkened angular-diameter measurements of β UMa in the
                      near-infrared (Center for High Angular Resolution Astronomy
                      (CHARA) Array, 1.149 ± 0.014 mas) and mid-infrared (Keck
                      Nuller, 1.08 ± 0.07 mas), together with the measured
                      parallax and bolometric flux, have constrained the effective
                      temperature. This paper presents current VERITAS-SII
                      observation and analysis procedures to derive squared
                      visibilities from correlation functions. We fit the
                      resulting squared visibilities to find a limb-darkened
                      angular diameter of 1.07 ± 0.04 (stat) ± 0.05 (sys) mas,
                      using synthetic visibilities from a stellar atmosphere model
                      that provides a good match to the spectrum of β UMa in the
                      optical wave band. The VERITAS-SII limb-darkened angular
                      diameter yields an effective temperature of 9700 ± 200 ±
                      200 K, consistent with ultraviolet spectrophotometry, and an
                      age of 390 ± 29 ± 32 Myr, using MESA Isochrones and
                      Stellar Tracks. This age is consistent with 408 ± 6 Myr
                      from the CHARA Array angular diameter.},
      cin          = {$Z_CTA$ / $Z_CTAS$},
      ddc          = {520},
      cid          = {$I:(DE-H253)Z_CTA-20210408$ / $I:(DE-H253)Z_CTAS-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613)},
      pid          = {G:(DE-HGF)POF4-613},
      experiment   = {EXP:(DE-H253)VERITAS-20170101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2401.01853},
      howpublished = {arXiv:2401.01853},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2401.01853;\%\%$},
      UT           = {WOS:001220887700001},
      doi          = {10.3847/1538-4357/ad2b68},
      url          = {https://bib-pubdb1.desy.de/record/618798},
}