KFU. Card publication. Determining the Characteristics of Lan 30 from Optical Observations

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FEDERAL UNIVERSITY

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DETERMINING THE CHARACTERISTICS OF LAN 30 FROM OPTICAL OBSERVATIONS

Form of presentation

Articles in international journals and collections

Year of publication

2021

Язык

английский

Authors, employees of KFU

Dyominova Nailya Rafaelevna, author

Shimanskiy Vladislav Vladimirovich, author

Bibliographic description in the original language

Deminova N.R, Shimanskii V.V, Borisov N.V, Determining the Characteristics of Lan 30 from Optical Observations//Astronomy Letters. - 2021. - Vol.47, Is.5. - P.307-315.

Annotation

We have performed a model analysis of the optical radiation from the young pre-cataclysmic variable Lan 30 and determined the set of its fundamental characteristics. Spectroscopic and multiband photometric observations have been carried out with the BTA and Zeiss-1000 telescopes at the Special Astrophysical Observatory of the Russian Academy of Sciences. The technique for modeling irradiated atmospheres of stars in close binary systems has been used for the computations of synthetic spectra and light curves. We have established the dominance of the radiation from an sdB subdwarf with atmospheric parameters Teff = 30 500 ? 1100 K and log g = 5.60 ? 0.10 in the optical band under moderate influence of reflection effects on the light curves and HI line profiles. We have analyzed the measured sets of radial velocities of the primary component by taking into account the possible influence of reflection effects on them and refined their semi-amplitude K1 = 56.3 ? 2.0 km s−1. We have found that the nearly sinusoidal shape of the light curves of Lan 30 allows only an upper limit on the orbital inclination to be set. Based on agreement between the model and observed light curves, we have estimated the radii of the components at various inclinations. To determine their lower limit, we have used evolutionary estimates of the radii of lowmass main-sequence stars. The mass of the primary component has been taken to be equal to the normal mass of single sdB subdwarfs, M1 = 0.47 M . As a result, we have determined the ranges of possible variations of the orbital inclination i = 33◦−45◦ and semimajor axis, the radii of the components, and the massM2 = 0.127−0.175M of the red dwarf.

Keywords

spectra, stars: parameters, modeling: reflection effects, stars: Lan 30

The name of the journal

Astronomy Letters

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112171756&doi=10.1134%2fS1063773721050030&partnerID=40&md5=4fd5ebb89da5133072338941712045d5

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=255819&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Dyominova Nailya Rafaelevna	ru_RU
dc.contributor.author	Shimanskiy Vladislav Vladimirovich	ru_RU
dc.date.accessioned	2021-01-01T00:00:00Z	ru_RU
dc.date.available	2021-01-01T00:00:00Z	ru_RU
dc.date.issued	2021	ru_RU
dc.identifier.citation	Deminova N.R, Shimanskii V.V, Borisov N.V, Determining the Characteristics of Lan 30 from Optical Observations//Astronomy Letters. - 2021. - Vol.47, Is.5. - P.307-315.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=255819&p_lang=2	ru_RU
dc.description.abstract	Astronomy Letters	ru_RU
dc.description.abstract	We have performed a model analysis of the optical radiation from the young pre-cataclysmic variable Lan 30 and determined the set of its fundamental characteristics. Spectroscopic and multiband photometric observations have been carried out with the BTA and Zeiss-1000 telescopes at the Special Astrophysical Observatory of the Russian Academy of Sciences. The technique for modeling irradiated atmospheres of stars in close binary systems has been used for the computations of synthetic spectra and light curves. We have established the dominance of the radiation from an sdB subdwarf with atmospheric parameters Teff = 30 500 ? 1100 K and log g = 5.60 ? 0.10 in the optical band under moderate influence of reflection effects on the light curves and HI line profiles. We have analyzed the measured sets of radial velocities of the primary component by taking into account the possible influence of reflection effects on them and refined their semi-amplitude K1 = 56.3 ? 2.0 km s−1. We have found that the nearly sinusoidal shape of the light curves of Lan 30 allows only an upper limit on the orbital inclination to be set. Based on agreement between the model and observed light curves, we have estimated the radii of the components at various inclinations. To determine their lower limit, we have used evolutionary estimates of the radii of lowmass main-sequence stars. The mass of the primary component has been taken to be equal to the normal mass of single sdB subdwarfs, M1 = 0.47 M . As a result, we have determined the ranges of possible variations of the orbital inclination i = 33◦−45◦ and semimajor axis, the radii of the components, and the massM2 = 0.127−0.175M of the red dwarf.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	spectra	ru_RU
dc.subject	stars: parameters	ru_RU
dc.subject	modeling: reflection effects	ru_RU
dc.subject	stars: Lan 30	ru_RU
dc.title	Determining the Characteristics of Lan 30 from Optical Observations	ru_RU
dc.type	Articles in international journals and collections	ru_RU