OGLE-BLAP-009-a case study for the properties and evolution of blue large-amplitude pulsators

被引：5

作者：

Bradshaw, Corey W. ^{[1
]}

Dorsch, Matti ^{[2
,3
,4
]}

Kupfer, Thomas ^{[1
,5
]}

Barlow, Brad N. ^{[6
,7
]}

Heber, Uli ^{[3
,4
]}

Bauer, Evan B. ^{[8
]}

Bildsten, Lars ^{[9
]}

van Roestel, Jan ^{[10
]}

机构：

[1] Texas Tech Univ, Dept Phys & Astron, Lubbock, TX 79409 USA

[2] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[3] Friedrich Alexander Univ Erlangen Nuremberg FAU, Astron Inst, Dr Karl Remeis Observ, D-96049 Bamberg, Germany

[4] Friedrich Alexander Univ Erlangen Nuremberg FAU, Astron Inst, ECAP, D-96049 Bamberg, Germany

[5] Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany

[6] High Point Univ, Dept Phys & Astron, High Point, NC 27268 USA

[7] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

[8] Harvard & Smithsonian, Ctr Astrophys, Cambridge, MA 02138 USA

[9] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

[10] Univ Amsterdam, Anton Pannekoek Inst Astron, Amsterdam, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 527卷 / 04期

基金：

美国国家科学基金会;

关键词：

asteroseismology; stars: evolution; stars: individual: OGLE-BLAP-009; stars: oscillations (including pulsations); PERIOD VARIABLE-STARS; CONVECTIVE BOUNDARIES; PROJECTION FACTOR; OMEGAWHITE SURVEY; B STARS; MODULES; BINARIES; SPECTROSCOPY; PULSATIONS; PHOTOMETRY;

D O I：

10.1093/mnras/stad3845

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Blue large-amplitude pulsators (BLAPs) make up a rare class of hot pulsating stars with effective temperatures of approximate to 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 approximate to 0.30 M circle dot.

引用

页码：10239 / 10253

页数：15

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