首页|KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge:
I. Discovery of Wide-orbit Companions in OGLE-BLAP-006
KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge: I. Discovery of Wide-orbit Companions in OGLE-BLAP-006
KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge: I. Discovery of Wide-orbit Companions in OGLE-BLAP-006
天文学
Seung-Lee Kim,Chung-Uk Lee,Kyeongsoo Hong,Jae Woo Lee,Dong-Jin Kim,Sang-Mok Cha,Yongseok Lee,Dong-Joo Lee,Byeong-Gon Park.KMTNet View of Blue Large-amplitude Pulsators Toward the Galactic Bulge: I. Discovery of Wide-orbit Companions in OGLE-BLAP-006[EB/OL].(2025-03-24)[2025-10-25].https://arxiv.org/abs/2503.18379.点此复制
Blue large-amplitude pulsators (BLAPs), a recently classified type of
variable stars, are evolved objects likely formed through interactions between
stars in a binary system. However, only two BLAPs with stellar companions have
been discovered to date. This paper presents photometric data from the Korea
Microlensing Telescope Network (KMTNet) for three BLAPs located in the
direction of the Galactic bulge: OGLE-BLAP-006, OGLE-BLAP-007, and
OGLE-BLAP-009. The data were collected over eight consecutive years, beginning
in 2016, with a high cadence of approximately 15 minutes. Frequency analysis of
light variations revealed OGLE-BLAP-006 as a multimode pulsator with a dominant
frequency of 37.88 day$^{-1}$ and two new frequencies of 38.25 and 35.05
day$^{-1}$. In contrast, OGLE-BLAP-007 and OGLE-BLAP-009 exhibit single-mode
pulsation. By combining the KMTNet data with archival OGLE observations, we
investigated pulsation timing variations of the BLAPs using an $O-C$ diagram to
identify the light travel time effect caused by the orbital motion of their
companions. We found that OGLE-BLAP-006, with no evidence of close companions,
has two wide-orbit companions with orbital periods of approximately 4,700 and
6,300 days, making it the third known BLAP in a stellar system; however, no
companions were found for OGLE-BLAP-007 and OGLE-BLAP-009. Furthermore, we
identified seven other BLAP candidates with wide companions using OGLE data,
suggesting that such systems are relatively common. We propose that a BLAP with
a wide companion may be a merger remnant of an inner close binary within a
hierarchical triple system.
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