Molecular emission from GG Carinae's circumbinary disk

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F13%3A00399497" target="_blank" >RIV/67985815:_____/13:00399497 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1051/0004-6361/201220442" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201220442</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201220442" target="_blank" >10.1051/0004-6361/201220442</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Molecular emission from GG Carinae's circumbinary disk

Popis výsledku v původním jazyce

We aim at studying the kinematics and origin of the disk in the eccentric binary system GG Car, whose primary component is proposed to be a B[e] supergiant. We find that the CO gas is located in a ring surrounding the eccentric binary system, and its kinematics agrees with Keplerian rotation with a velocity, projected to the line of sight, of 80 +/- 1 km s(-1). The CO ring has a column density of (5 +/- 3) x 10(21) cm(-2) and a temperature of 3200 +/- 500 K. In addition, the material is chemically enriched in C-13, which agrees with the primary component being slightly evolved off the main sequence. We discuss two possible scenarios for the origin of the circumbinary disk: (i) non-conservative Roche lobe overflow; and (ii) the possibility that the progenitor of the primary component could have been a classical Be star. Neither can be firmly excluded, but for Roche lobe overflow to occur, a combination of stellar and orbital parameter extrema would be required.

Název v anglickém jazyce

Molecular emission from GG Carinae's circumbinary disk

Popis výsledku anglicky

We aim at studying the kinematics and origin of the disk in the eccentric binary system GG Car, whose primary component is proposed to be a B[e] supergiant. We find that the CO gas is located in a ring surrounding the eccentric binary system, and its kinematics agrees with Keplerian rotation with a velocity, projected to the line of sight, of 80 +/- 1 km s(-1). The CO ring has a column density of (5 +/- 3) x 10(21) cm(-2) and a temperature of 3200 +/- 500 K. In addition, the material is chemically enriched in C-13, which agrees with the primary component being slightly evolved off the main sequence. We discuss two possible scenarios for the origin of the circumbinary disk: (i) non-conservative Roche lobe overflow; and (ii) the possibility that the progenitor of the primary component could have been a classical Be star. Neither can be firmly excluded, but for Roche lobe overflow to occur, a combination of stellar and orbital parameter extrema would be required.

Druh

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

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP209%2F11%2F1198" target="_blank" >GAP209/11/1198: Okolohvězdné prostředí horkých vyvinutých hvězd</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

—

Svazek periodika

549

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

7

Strana od-do

"A28/1"-"A28/7"

Kód UT WoS článku

000313745000028

EID výsledku v databázi Scopus

—