Evidence of the Evolved Nature of the B[e] Star MWC 137

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F15%3A00445025" target="_blank" >RIV/67985815:_____/15:00445025 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1088/0004-6256/149/1/13" target="_blank" >http://dx.doi.org/10.1088/0004-6256/149/1/13</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0004-6256/149/1/13" target="_blank" >10.1088/0004-6256/149/1/13</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evidence of the Evolved Nature of the B[e] Star MWC 137

Popis výsledku v původním jazyce

Our goal is to clarify the evolutionary stage of this peculiar object, and to study the CO molecular component of its circumstellar medium. To this purpose, we modeled the CO molecular bands using high-resolution K-band spectra.We find that MWC137 is surrounded by a detached cool (T = 1900 +/- 100 K) and dense (N = (3 +/- 1) +/- 10(21) cm(-2)) ring of CO gas orbiting the star with a rotational velocity, projected to the line of sight, of 84 +/- 2 km s(-1). We also find that the molecular gas is enrichedin the isotope C-13, excluding the classification of the star as a Herbig Be. The observed isotopic abundance ratio (C-12/C-13 = 25 +/- 2) derived from our modeling is compatible with a proto-planetary nebula, main-sequence, or supergiant evolutionary phase. However, based on some observable characteristics of MWC137, we propose that the supergiant scenario seems to be the most plausible. Hence, we suggest that MWC137 could be in an extremely short-lived phase, evolving from a B[e] supe

Název v anglickém jazyce

Evidence of the Evolved Nature of the B[e] Star MWC 137

Popis výsledku anglicky

Our goal is to clarify the evolutionary stage of this peculiar object, and to study the CO molecular component of its circumstellar medium. To this purpose, we modeled the CO molecular bands using high-resolution K-band spectra.We find that MWC137 is surrounded by a detached cool (T = 1900 +/- 100 K) and dense (N = (3 +/- 1) +/- 10(21) cm(-2)) ring of CO gas orbiting the star with a rotational velocity, projected to the line of sight, of 84 +/- 2 km s(-1). We also find that the molecular gas is enrichedin the isotope C-13, excluding the classification of the star as a Herbig Be. The observed isotopic abundance ratio (C-12/C-13 = 25 +/- 2) derived from our modeling is compatible with a proto-planetary nebula, main-sequence, or supergiant evolutionary phase. However, based on some observable characteristics of MWC137, we propose that the supergiant scenario seems to be the most plausible. Hence, we suggest that MWC137 could be in an extremely short-lived phase, evolving from a B[e] supe

Druh

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

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Astronomical Journal

ISSN

0004-6256

e-ISSN

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Svazek periodika

149

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

"13/1"-"13/9"

Kód UT WoS článku

000347308300013

EID výsledku v databázi Scopus

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