TOWARD UNDERSTANDING THE B[e] PHENOMENON. V. NATURE AND SPECTRAL VARIATIONS OF THE MWC 728 BINARY SYSTEM

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F15%3A10315910" target="_blank" >RIV/00216208:11320/15:10315910 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985815:_____/15:00449351

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0004-637X/809/2/129" target="_blank" >http://dx.doi.org/10.1088/0004-637X/809/2/129</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0004-637X/809/2/129" target="_blank" >10.1088/0004-637X/809/2/129</a>

Jazyk výsledku

angličtina

Název v původním jazyce

TOWARD UNDERSTANDING THE B[e] PHENOMENON. V. NATURE AND SPECTRAL VARIATIONS OF THE MWC 728 BINARY SYSTEM

Popis výsledku v původním jazyce

We report the results of a long-term spectroscopic monitoring of the FS CMa type object MWC 728. We found that it is a binary system with a B5 Ve (T-eff = 14,000 +/- 1000 K) primary and a G8 III type (T-eff +/- 5000 K) secondary. Absorption line positions of the secondary vary, with a semi-amplitude of similar to 20 km s(-1) and a period of 27.5 days. The system's mass function is 2.3 x 10(-2) M-circle dot, and its orbital plane is similar to 13 degrees-15 degrees tilted from the plane of the sky. The primary's upsilon sin i similar to 110 km s(-1), combined with this tilt, implies that it rotates at a nearly breakup velocity. We detected strong variations of the Balmer and He I emission-line profiles on timescales from days to years. This points to avariable stellar wind of the primary in addition to the presence of a circum-primary gaseous disk. The strength of the absorption-line spectrum, along with the optical and near infrared (IR) continuum, suggest that the primary contributes

Název v anglickém jazyce

TOWARD UNDERSTANDING THE B[e] PHENOMENON. V. NATURE AND SPECTRAL VARIATIONS OF THE MWC 728 BINARY SYSTEM

Popis výsledku anglicky

We report the results of a long-term spectroscopic monitoring of the FS CMa type object MWC 728. We found that it is a binary system with a B5 Ve (T-eff = 14,000 +/- 1000 K) primary and a G8 III type (T-eff +/- 5000 K) secondary. Absorption line positions of the secondary vary, with a semi-amplitude of similar to 20 km s(-1) and a period of 27.5 days. The system's mass function is 2.3 x 10(-2) M-circle dot, and its orbital plane is similar to 13 degrees-15 degrees tilted from the plane of the sky. The primary's upsilon sin i similar to 110 km s(-1), combined with this tilt, implies that it rotates at a nearly breakup velocity. We detected strong variations of the Balmer and He I emission-line profiles on timescales from days to years. This points to avariable stellar wind of the primary in addition to the presence of a circum-primary gaseous disk. The strength of the absorption-line spectrum, along with the optical and near infrared (IR) continuum, suggest that the primary contributes

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Astrophysical Journal

ISSN

0004-637X

e-ISSN

—

Svazek periodika

809

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

000361655100022

EID výsledku v databázi Scopus

2-s2.0-84939807264