CPD-64 degrees 2731: a massive spun-up and rejuvenated high-velocity runaway star

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00511173" target="_blank" >RIV/67985815:_____/19:00511173 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1093/mnras/sty2987" target="_blank" >https://doi.org/10.1093/mnras/sty2987</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/sty2987" target="_blank" >10.1093/mnras/sty2987</a>

Jazyk výsledku

angličtina

Název v původním jazyce

CPD-64 degrees 2731: a massive spun-up and rejuvenated high-velocity runaway star

Popis výsledku v původním jazyce

We report the results of our study of the high-velocity (approximate to 160 km s(-1)) runaway O star CPD-64 degrees 2731 and its associated horseshoe-shaped nebula discovered with the Wide-field Infrared Survey Explorer. Spectroscopic observations with the Southern African Large Telescope and spectral analysis indicate that CPD-64 degrees 2731 is a fast-rotating main-sequence O5.5 star with enhanced surface nitrogen abundance. We derive a projected rotational velocity of approximate to 300 km s(-1) that is extremely high for this spectral type. Its kinematic age of approximate to 6 Myr, assuming it was born near the Galactic plane, exceeds its age derived from single star models by a factor of 2. These properties suggest that CPD-64 degrees 2731 is a rejuvenated and spun-up binary product. The geometry of the nebula and the almost central location of the star within it argue against a pure bow shock interpretation for the nebula. Instead, we suggest that the binary interaction happened recently, thereby creating the nebula, with a cavity blown by the current fast stellar wind. This inference is supported by our results of 2D numerical hydrodynamic modelling.

Název v anglickém jazyce

CPD-64 degrees 2731: a massive spun-up and rejuvenated high-velocity runaway star

Popis výsledku anglicky

We report the results of our study of the high-velocity (approximate to 160 km s(-1)) runaway O star CPD-64 degrees 2731 and its associated horseshoe-shaped nebula discovered with the Wide-field Infrared Survey Explorer. Spectroscopic observations with the Southern African Large Telescope and spectral analysis indicate that CPD-64 degrees 2731 is a fast-rotating main-sequence O5.5 star with enhanced surface nitrogen abundance. We derive a projected rotational velocity of approximate to 300 km s(-1) that is extremely high for this spectral type. Its kinematic age of approximate to 6 Myr, assuming it was born near the Galactic plane, exceeds its age derived from single star models by a factor of 2. These properties suggest that CPD-64 degrees 2731 is a rejuvenated and spun-up binary product. The geometry of the nebula and the almost central location of the star within it argue against a pure bow shock interpretation for the nebula. Instead, we suggest that the binary interaction happened recently, thereby creating the nebula, with a cavity blown by the current fast stellar wind. This inference is supported by our results of 2D numerical hydrodynamic modelling.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

1365-2966

e-ISSN

—

Svazek periodika

482

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

14

Strana od-do

4408-4421

Kód UT WoS článku

000462327300011

EID výsledku v databázi Scopus

2-s2.0-85061102345