%0 Journal Article
%A Acharyya, A.
%A Aufdenberg, J. P.
%A Bangale, P.
%A Bartkoske, J. T.
%A Batista, P.
%A Benbow, W.
%A Chromey, A. J.
%A Davis, J. D.
%A Feng, Q.
%A Foote, G. M.
%A Furniss, A.
%A Hanlon, W.
%A Hinrichs, C. E.
%A Holder, J.
%A Jin, W.
%A Kaaret, P.
%A Kertzman, M.
%A Kieda, D.
%A Kleiner, T. K.
%A Korzoun, N.
%A LeBohec, T.
%A Lisa, M. A.
%A Lundy, M.
%A Matthews, N.
%A McGrath, C. E
%A Millard, M. J.
%A Moriarty, P.
%A Nikkhah, S.
%A O’Brien, S.
%A Ong, R. A.
%A Pohl, M.
%A Pueschel, E.
%A Quinn, J.
%A Rabinowitz, P. L.
%A Ragan, K.
%A Roache, E.
%A Rose, J. G.
%A Sackrider, J. L.
%A Sadeh, I.
%A Saha, L.
%A Sembroski, G. H.
%A Shang, R.
%A Tak, D.
%A Ticoras, M.
%A Tucci, J. V.
%A Williams, D. A.
%A Wong, S. L.
%T An Angular Diameter Measurement of β UMa via Stellar Intensity Interferometry with the VERITAS Observatory
%J The astrophysical journal / Part 1
%V 966
%N 1
%@ 0004-637X
%C London
%I Institute of Physics Publ.
%M PUBDB-2024-07159
%M arXiv:2401.01853
%P 28
%D 2024
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001220887700001
%R 10.3847/1538-4357/ad2b68
%U https://bib-pubdb1.desy.de/record/618798