A5028402045- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
Georgia State University
2022-2023
Classical Be stars are possible products of close binary evolution, in which the mass donor becomes a hot, stripped O or B-type subdwarf (sdO/sdB), and gainer spins up grows disk to become star. While several Be+sdO binaries have been identified, dynamical masses other fundamental parameters available only for single system, limiting confrontation with evolution models. In this work, we present direct interferometric detections sdO companions three 28 Cyg, V2119 60 all were previously found...
HD 93521 is a massive, rapidly rotating star that located about 1 kpc above the Galactic disk, and evolutionary age for its estimated mass much less than time-of-flight if it was ejected from disk. Here we present re-assessment of both kinematical timescales 93521. We calculate 39 +/- 3 Myr based upon distance proper motions Gaia EDR3 summary radial velocity measurements. then determine stellar luminosity using rotational model combined with observed spectral energy distribution distance. A...
The eclipsing binary IT Librae is an unusual system of two B-type stars that situated about 1 kpc above the galactic plane. was probably ejected from its birthplace in disk, but implied time-of-flight to current location exceeds evolutionary lifetime primary star. Here we present a study new high dispersion spectroscopy and exquisite light curve Kepler K2 mission order determine properties resolve timescale discrepancy. We derive revised spectroscopic orbit radial velocity measurements...