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@ARTICLE{Acharyya:601892,
      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 Wong, S. L.},
      collaboration = {{VERITAS Collaboration}},
      title        = {{A}n {A}ngular {D}iameter {M}easurement of $\beta$ {UM}a
                      via {S}tellar {I}ntensity {I}nterferometry with the
                      {VERITAS} {O}bservatory},
      reportid     = {PUBDB-2024-00404, arXiv:2401.01853},
      year         = {2023},
      abstract     = {We use the VERITAS imaging air Cherenkov Telescope (IACT)
                      array to obtain the first measured angular diameter of
                      $\beta$ 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 ($\beta$ 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 $\beta$ UMa in the near-infrared (CHARA Array, $1.149 \pm
                      0.014$ mas) and mid-infrared (Keck Nuller, $1.08 \pm 0.07$
                      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 $1.07 \pm 0.04 {\rm
                      (stat)} \pm 0.05$ (sys) mas, using synthetic visibilities
                      from a stellar atmosphere model that provides a good match
                      to the spectrum of $\beta$ UMa in the optical wave band. The
                      VERITAS-SII limb-darkened angular diameter yields an
                      effective temperature of $9700\pm200\pm 200$ K, consistent
                      with ultraviolet spectrophotometry, and an age of $390\pm 29
                      \pm 32 $ Myr, using MESA Isochrones and Stellar Tracks
                      (MIST). This age is consistent with $408 \pm 6$ Myr from the
                      CHARA Array angular diameter.},
      keywords     = {atmosphere: model (INSPIRE) / temperature (INSPIRE) /
                      interferometer (INSPIRE) / tracks (INSPIRE) / VERITAS
                      (INSPIRE) / observatory (INSPIRE) / correlation function
                      (INSPIRE) / Cherenkov counter (INSPIRE) / air (INSPIRE) /
                      gamma ray: VHE (INSPIRE) / photomultiplier (INSPIRE) / radio
                      wave (INSPIRE) / frequency (INSPIRE) / flux (INSPIRE) /
                      optical (INSPIRE) / bolometer (INSPIRE) / imaging (INSPIRE)
                      / ultraviolet (INSPIRE) / nucleus (INSPIRE)},
      cin          = {$Z_VER$ / ZEU-CTA},
      cid          = {$I:(DE-H253)Z_VER-20210408$ / I:(DE-H253)ZEU-CTA-20120731},
      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)25},
      eprint       = {2401.01853},
      howpublished = {arXiv:2401.01853},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2401.01853;\%\%$},
      doi          = {10.3204/PUBDB-2024-00404},
      url          = {https://bib-pubdb1.desy.de/record/601892},
}