Absolute parameters of young stars: PU Pup

Yükleniyor...
Küçük Resim

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