TY  - JOUR
AU  - Acharyya, A.
AU  - Aufdenberg, J. P.
AU  - Bangale, P.
AU  - Bartkoske, J. T.
AU  - Batista, P.
AU  - Benbow, W.
AU  - Chromey, A. J.
AU  - Davis, J. D.
AU  - Feng, Q.
AU  - Foote, G. M.
AU  - Furniss, A.
AU  - Hanlon, W.
AU  - Hinrichs, C. E.
AU  - Holder, J.
AU  - Jin, W.
AU  - Kaaret, P.
AU  - Kertzman, M.
AU  - Kieda, D.
AU  - Kleiner, T. K.
AU  - Korzoun, N.
AU  - LeBohec, T.
AU  - Lisa, M. A.
AU  - Lundy, M.
AU  - Matthews, N.
AU  - McGrath, C. E
AU  - Millard, M. J.
AU  - Moriarty, P.
AU  - Nikkhah, S.
AU  - O’Brien, S.
AU  - Ong, R. A.
AU  - Pohl, M.
AU  - Pueschel, E.
AU  - Quinn, J.
AU  - Rabinowitz, P. L.
AU  - Ragan, K.
AU  - Roache, E.
AU  - Rose, J. G.
AU  - Sackrider, J. L.
AU  - Sadeh, I.
AU  - Saha, L.
AU  - Sembroski, G. H.
AU  - Shang, R.
AU  - Tak, D.
AU  - Ticoras, M.
AU  - Tucci, J. V.
AU  - Williams, D. A.
AU  - Wong, S. L.
TI  - An Angular Diameter Measurement of β UMa via Stellar Intensity Interferometry with the VERITAS Observatory
JO  - The astrophysical journal / Part 1
VL  - 966
IS  - 1
SN  - 0004-637X
CY  - London
PB  - Institute of Physics Publ.
M1  - PUBDB-2024-07159
M1  - arXiv:2401.01853
SP  - 28
PY  - 2024
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001220887700001
DO  - DOI:10.3847/1538-4357/ad2b68
UR  - https://bib-pubdb1.desy.de/record/618798
ER  -