Astrophysical Quantities of Cepheid Variables Measured with the Navy Prototype Optical Interferometer

Citations Over TimeTop 10% of 2000 papers

Abstract

We present mean angular diameters for two cepheid variables, alpha Ursae Minoris and zeta Geminorum, determined with the Navy Prototype Optical Interferometer (NPOI). We present linear radii for these cepheids and two additional cepheids, delta Cephei and eta Aquilae, previously observed at the NPOI. We find the limb-darkened angular diameter of alpha Ursae Minoris and of zeta Geminorum to be 3.28 +/- 0.02 and 1.55 +/- 0.09 milliarcseconds respectively. Using trigonometric parallaxes, we find the linear radii of alpha Ursae Minoris, zeta Geminorum, delta Cephei and eta Aquilae to be 46 (+/- 3), 60 (+25, -14), 45 (+8, -6), and 69 (+28, -15) Solar radii respectively. We compare the pulsation periods and linear radii of this sample of cepheids, which range in period from three to 11 days, to theoretical and empirical period-radius and period-radius-mass relations found in the literature. We find that the observed diameter of alpha Ursae Minoris is in excellent agreement with the predicted diameter as determined from both surface brightness techniques and theory only if alpha Ursae Minoris is a first overtone pulsator.

Related Papers

• → Cepheids in M31: The PAndromeda Cepheid Sample(2018)25 cited
• → Metallic-line and H radial velocities of seven southern Cepheids: a comparative analysis(1992)34 cited
• Susquehanna Chorale Spring Concert "Roots and Wings"(2017)
• IDENTIFIKASI MODE RUSAK JAMAK (MULTI-FAULTS) BANTALAN MENGGUNAKAN ANALISIS ENVELOPE PADA TURBIN ANGIN Horizontal Axis(2018)
• → ИСПОЛЬЗОВAНИЕ ПОТЕНЦИAЛA СОЦИAЛЬНЫХ ПAРТНЕРОВ В ПОДГОТОВКЕ БУДУЩИХ ПЕДAГОГОВ(2024)