Absolute parameters of young stars: PU Pup
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IOP Publishing
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We present combined photometric and spectroscopic analyses of the southern
binary star PU Pup. High-resolution spectra of this system were taken at the University of
Canterbury Mt. John Observatory in the years 2008 and again in 2014-15. We find the light
contribution of the secondary component to be only ∼2% of the total light of the system
in optical wavelengths, resulting in a single-lined spectroscopic binary. Recent TESS data
revealed grazing eclipses within the light minima, though the tidal distortion, examined
also from HIPPARCOS data, remains the predominating light curve effect. Our model
shows PU Pup to have the more massive primary relatively close to filling its Roche lobe.
PU Pup is thus approaching the rare ‘fast phase’ of interactive (Case B) evolution. Our
adopted absolute parameters are as follows: M1 = 4.10 (±0.20) M , M2 = 0.65 (±0.05)
M , R1 = 6.60 (±0.30) R , R2 = 0.90 (±0.10) R ; T1 = 11500 (±500) K, T2 = 5000
(±350) K; photometric distance = 186 (±20) pc, age = 170 (±20) My. The less-massive
secondary component is found to be significantly oversized and overluminous compared
to standard Main Sequence models. We discuss this discrepancy referring to heating from
the reflection effect.
Açıklama
Anahtar Kelimeler
Stars: Binaries (İncluding Multiple) Close, Stars: Early Type, Stars: İndividual PU Pup, The Galaxy: Stellar Content
Kaynak
Research in Astronomy and Astrophysics (RAA)
WoS Q Değeri
Q3
Scopus Q Değeri
Cilt
21
Sayı
10
Künye
Erdem, A., Sürgit, D., Banks, T. S., Ozkardeş, B., & Budding, E. (2021). Absolute parameters of young stars: PU pup. Research in Astronomy and Astrophysics, 21(10) doi:10.1088/1674-4527/21/10/256
