Absolute properties of the pre-main-sequence eclipsing binary star NP Persei

Znanstveni rad - Izvorni znanstveni rad

• Autor: Claud H. Sandberg Lacy
• Autor: Francis C. Fekel
• Autor: Krešimir Pavlovski
• Autor: Guillermo Torres
• Autor: Matthew W. Muterspaugh
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika; Astronomija i astrofizika

Sažetak (engleski)

NP Per is a well-detached, 2.2 day eclipsing binary whose components are both pre-main-sequence stars that are still contracting toward the main-sequence phase of evolution. We report extensive photometric and spectroscopic observations with which we have determined their properties accurately. Their surface temperatures are quite different: 6420 ± 90 K for the larger F5 primary star and 4540 ± 160 K for the smaller K5e star. Their masses and radii are 1.3207 ± 0.0087 solar masses and 1.372 ± 0.013 solar radii for the primary, and 1.0456 ± 0.0046 solar masses and 1.229 ± 0.013 solar radii for the secondary. The orbital period is variable over long periods of time. A comparison of the observations with current stellar evolution models from MESA indicates that the stars cannot be fit at a single age: the secondary appears significantly younger than the primary. If the stars are assumed to be coeval and to have the age of the primary (17 Myr), then the secondary is larger and cooler than predicted by current models. The Hα spectral line of the secondary component is completely filled by, presumably, chromospheric emission due to a magnetic activity cycle.

• Ključne riječi (engleski): binary stars; pre-main-sequence; stellar evolution
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Astronomical Journal
• Brojčani podaci: vol. 152, br. 1, 2
• p-ISSN: 0004-6256
• e-ISSN: 1538-3881
• DOI: https://doi.org/10.3847/0004-6256/152/1/2
• URN:NBN: urn:nbn:hr:217:559912
• Datum objave publikacije: 2016
• Projekt: Šifra: IP-2014-09-8656; Naziv (hrvatski): Zvijezde i prašina: struktura, sastav i interakcija; Kratica: STARDUST; Voditelj: Krešimir Pavlovski; Pravna nadležnost: Hrvatska; Financijer: HRZZ; Linija financiranja: IP
• URL dokumenta: https://iopscience.iop.org/article/10.3847/0004-6256/152/1/2
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2016. The American Astronomical Society. Received 2016 February 3. Accepted 2016 March 14. Published 2016 June 6.
• Datum i vrijeme pohrane: 2020-02-09 13:38:28