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Pregled bibliografske jedinice broj: 1219081

Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357

Koubský, P.; Harmanec, P.; Brož, M.; Kotková, L.; Yang, S.; Božić, H.; Sudar, D.; Frémat, Y.; Korčáková, D.; Votruba, V. et al.
Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357 // Astronomy & ; Astrophysics, 629 (2019), 105, 14 doi:10.1051/0004-6361/201834597 (međunarodna recenzija, članak, znanstveni)

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Naslov
Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357

Autori
Koubský, P. ; Harmanec, P. ; Brož, M. ; Kotková, L. ; Yang, S. ; Božić, H. ; Sudar, D. ; Frémat, Y. ; Korčáková, D. ; Votruba, V. ; Škoda, P. ; Šlechta, M. ; Ruždjak, D.

Izvornik
Astronomy &amp ; Astrophysics (0004-6361) 629 (2019); 105, 14

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
binaries: close ; binaries: spectroscopic ; stars: emission-line ; Be ; stars: fundamental parameters ; stars: individual: HD 81357 ; Astrophysics - Solar and Stellar Astrophysics

Sažetak
Reliable determination of the basic physical properties of hot emission-line binaries with Roche-lobe filling secondaries is important for developing the theory of mass exchange in binaries. It is not easy, however, due to the presence of circumstellar matter. Here, we report the first detailed investigation of a new representative of this class of binaries, HD 81357, based on the analysis of spectra and photometry from several observatories. HD 81357 was found to be a double-lined spectroscopic binary and an ellipsoidal variable seen under an intermediate orbital inclination of ∼(63 ± 5)°, having an orbital period of 33.d77445(41) and a circular orbit. From an automated comparison of the observed and synthetic spectra, we estimate the component's effective temperatures to be 12930(540) K and 4260(24) K. The combined light-curve and orbital solutions, also constrained by a very accurate Gaia Data Release 2 parallax, give the following values of the basic physical properties: masses 3.36 ± 0.15 and 0.34 ± 0.04M⊙N, radii 3.9 ± 0.2 and 13.97 ± 0.05R⊙N, and a mass ratio 10.0 ± 0.5. Evolutionary modelling of the system including the phase of mass transfer between the components indicated that HD 81357 is a system observed in the final slow phase of the mass exchange after the mass-ratio reversal. Contrary to what has been seen for similar binaries like AU Mon, no cyclic light variations were found on a time scale an order of magnitude longer than the orbital period. Based on new spectroscopic and photometric observations from the following instruments: CCD coudé spectrograph of the 2.0 m reflector of the Astronomical Institute AS ČR, Ondřejov, Czech Republic ; CCD coudé spectrograph of the 1.22 m reflector of the Dominion Astrophysical Observatory, Victoria, Canada ; photoelectric photometer of the 0.65 m Cassegrain reflector of the Hvar Observatory, Croatia, the Hp photometry from the ESA HIPPARCOS mission, and the ASAS-SN all-sky survey V photometry.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA

Projekti:
IP-2013-11-6212 - Promjenjivost Sunca i zvijezda (SOLSTEL) (Vršnak, Bojan, HRZZ - 2013-11) ( CroRIS)

Ustanove:
Geodetski fakultet, Zagreb

Profili:

Avatar Url Hrvoje Božić (autor)

Avatar Url Domagoj Ruždjak (autor)

Avatar Url Davor Sudar (autor)

Poveznice na cjeloviti tekst rada:

doi

Citiraj ovu publikaciju:

Koubský, P.; Harmanec, P.; Brož, M.; Kotková, L.; Yang, S.; Božić, H.; Sudar, D.; Frémat, Y.; Korčáková, D.; Votruba, V. et al.
Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357 // Astronomy & ; Astrophysics, 629 (2019), 105, 14 doi:10.1051/0004-6361/201834597 (međunarodna recenzija, članak, znanstveni)
Koubský, P., Harmanec, P., Brož, M., Kotková, L., Yang, S., Božić, H., Sudar, D., Frémat, Y., Korčáková, D. & Votruba, V. (2019) Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357. Astronomy & ; Astrophysics, 629, 105, 14 doi:10.1051/0004-6361/201834597.
@article{article, author = {Koubsk\'{y}, P. and Harmanec, P. and Bro\v{z}, M. and Kotkov\'{a}, L. and Yang, S. and Bo\v{z}i\'{c}, H. and Sudar, D. and Fr\'{e}mat, Y. and Kor\v{c}\'{a}kov\'{a}, D. and Votruba, V. and \v{S}koda, P. and \v{S}lechta, M. and Ru\v{z}djak, D.}, year = {2019}, pages = {14}, DOI = {10.1051/0004-6361/201834597}, chapter = {105}, keywords = {binaries: close, binaries: spectroscopic, stars: emission-line, Be, stars: fundamental parameters, stars: individual: HD 81357, Astrophysics - Solar and Stellar Astrophysics}, journal = {Astronomy and amp ; Astrophysics}, doi = {10.1051/0004-6361/201834597}, volume = {629}, issn = {0004-6361}, title = {Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357}, keyword = {binaries: close, binaries: spectroscopic, stars: emission-line, Be, stars: fundamental parameters, stars: individual: HD 81357, Astrophysics - Solar and Stellar Astrophysics}, chapternumber = {105} }
@article{article, author = {Koubsk\'{y}, P. and Harmanec, P. and Bro\v{z}, M. and Kotkov\'{a}, L. and Yang, S. and Bo\v{z}i\'{c}, H. and Sudar, D. and Fr\'{e}mat, Y. and Kor\v{c}\'{a}kov\'{a}, D. and Votruba, V. and \v{S}koda, P. and \v{S}lechta, M. and Ru\v{z}djak, D.}, year = {2019}, pages = {14}, DOI = {10.1051/0004-6361/201834597}, chapter = {105}, keywords = {binaries: close, binaries: spectroscopic, stars: emission-line, Be, stars: fundamental parameters, stars: individual: HD 81357, Astrophysics - Solar and Stellar Astrophysics}, journal = {Astronomy and amp ; Astrophysics}, doi = {10.1051/0004-6361/201834597}, volume = {629}, issn = {0004-6361}, title = {Properties and nature of Be stars 31. The binary nature, light variability, physical elements, and emission-line changes of HD 81357}, keyword = {binaries: close, binaries: spectroscopic, stars: emission-line, Be, stars: fundamental parameters, stars: individual: HD 81357, Astrophysics - Solar and Stellar Astrophysics}, chapternumber = {105} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus
  • Nature Index

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