OGLE-BLAP-009 – a case study for the properties and evolution of blue large-amplitude pulsators
Bradshaw CW, Dorsch M, Kupfer T, Barlow BN, Heber U, Bauer EB, Bildsten L, van Roestel J (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 527
Pages Range: 10239-10253
Journal Issue: 4
Abstract
Blue large-amplitude pulsators (BLAPs) make up a rare class of hot pulsating stars with effective temperatures of ≈30 000 K and surface gravities of 4.0–5.0 dex (cgs). The evolutionary origin and current status of BLAPs is not well understood, largely based on a lack of spectroscopic observations and no available mass constraints. However, several theoretical models have been proposed that reproduce their observed properties, including studies that identify them as pulsating helium-core pre-white dwarfs (He-core pre-WDs). We present here follow-up high-speed photometry and phase-resolved spectroscopy of one of the original 14 BLAPs, OGLE-BLAP-009, discovered during the Optical Gravitational Lensing Experiment. We aim to explore its pulsation characteristics and determine stellar properties such as mass and radius in order to test the consistency of these results with He-core pre-WD models. Using the mean atmospheric parameters found using spectroscopy, we fit a spectral energy distribution to obtain a preliminary estimate of the radius, luminosity, and mass by making use of the Gaia parallax. We then compare the consistency of these results to He-core pre-WD models generated using Modules for Experiments in Stellar Astrophysics, with predicted pulsation periods implemented using GYRE. We find that our mass constraints are in agreement with a low-mass He-core pre-WD of ≈0.30 M
Authors with CRIS profile
Involved external institutions
Texas Tech University (TTU)
United States (USA) (US)
Universität Potsdam
Germany (DE)
High Point University
United States (USA) (US)
Smithsonian Institution
United States (USA) (US)
University of California
United States (USA) (US)
University of Amsterdam
Netherlands (NL)
United States (USA) (US)
Universität Potsdam
Germany (DE)
High Point University
United States (USA) (US)
Smithsonian Institution
United States (USA) (US)
University of California
United States (USA) (US)
University of Amsterdam
Netherlands (NL)
How to cite
APA:
Bradshaw, C.W., Dorsch, M., Kupfer, T., Barlow, B.N., Heber, U., Bauer, E.B.,... van Roestel, J. (2024). OGLE-BLAP-009 – a case study for the properties and evolution of blue large-amplitude pulsators. Monthly Notices of the Royal Astronomical Society, 527(4), 10239-10253. https://dx.doi.org/10.1093/mnras/stad3845
MLA:
Bradshaw, Corey W., et al. "OGLE-BLAP-009 – a case study for the properties and evolution of blue large-amplitude pulsators." Monthly Notices of the Royal Astronomical Society 527.4 (2024): 10239-10253.
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