Absolute parameters of young stars: HX Velorum

“…The regular image sequencing for wavelength and relative flux calibration was followed (cf. Blackford et al, 2019), however, an error in the detector's flux meter led to under-exposure of some calibration frames. Subsequent checks on telluric lines in the science frames provided assurance that our final data reductions were accurate and consistent.…”

Section: Parametermentioning

confidence: 99%

“…General background was given by Budding (2008) and in the summary of Idaczyk et al (2013). For a recent example see Blackford et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Absolute Parameters of Young Stars: V Puppis

Budding,

Love,

Blackford

et al. 2021

Preprint

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New spectrometric data on V Pup are combined with satellite photometry (HIPPARCOS and recent TESS) to allow a revision of the absolute parameters with increased precision. We find: M 1 = 14.0±0.5, M 2 = 7.3±0.3 (M ); R 1 = 5.48±0.18, R 2 = 4.59±0.15 (R ); T 1 26000±1000, T 2 24000 ±1000 (K), age 5 ±1 (Myr), photometric distance 320 ±10 (pc). The TESS photometry reveals low-amplitude (∼0.002 mag) variations of the β Cep kind, consistent with the deduced evolutionary condition and age of the optical primary. This fact provides independent support to our understanding of the system as in a process of Case A type interactive evolution that can be compared with µ 1 Sco. The ∼10 M amount of matter shed by the over-luminous present secondary must have been mostly ejected from the system rather than transferred, thus taking angular momentum out of the orbit and keeping the pair in relative close proximity. New times of minima for V Pup have been studied and the results compared with previous analyses. The implied variation of period is consistent with the Case A evolutionary model, though we offer only a tentative sketch of the original arrangement of this massive system. We are not able to confirm the previously reported cyclical variations having a 5.47 yr period with the new data, though a direct comparison between the HIPPARCOS and TESS photometry points to the presence of third light from a star that is cooler than those of the close binary, as mentioned in previous literature.

show abstract

Absolute parameters of young stars: V puppis

Budding

Love

Blackford³

et al. 2021

Monthly Notices of the Royal Astronomical Society

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New spectrometric data on V Pup are combined with satellite photometry (HIPPARCOS and recent TESS) to allow a revision of the absolute parameters with increased precision. We find: M1 = 14.0±0.5, M2 = 7.3±0.3 (M⊙); R1 = 5.48±0.18, R2 = 4.59±0.15 (R⊙); T1 26000±1000, T2 24000 ±1000 (K), age 5 ±1 (Myr), photometric distance 320 ±10 (pc). The TESS photometry reveals low-amplitude (∼0.002 mag) variations of the β Cep kind, consistent with the deduced evolutionary condition and age of the optical primary. This fact provides independent support to our understanding of the system as in a process of Case A type interactive evolution that can be compared with μ1 Sco. The ∼10 M⊙ amount of matter shed by the over-luminous present secondary must have been mostly ejected from the system rather than transferred, thus taking angular momentum out of the orbit and keeping the pair in relative close proximity. New times of minima for V Pup have been studied and the results compared with previous analyses. The implied variation of period is consistent with the Case A evolutionary model, though we offer only a tentative sketch of the original arrangement of this massive system. We are not able to confirm the previously reported cyclical variations having a 5.47 yr period with the new data, though a direct comparison between the HIPPARCOS and TESS photometry points to the presence of third light from a star that is cooler than those of the close binary, as mentioned in previous literature.

show abstract

Absolute parameters of young stars: HX Velorum

Cited by 4 publications

References 0 publications

V410 Puppis: A useful laboratory for early stellar evolution

V410 Puppis: A useful laboratory for early stellar evolution

Absolute Parameters of Young Stars: V Puppis

Absolute parameters of young stars: V puppis

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