2015AJ....149...13M

Query : 2015AJ....149...13M

2015AJ....149...13M - Astron. J., 149, 13 (2015/January-0)

Evidence of the evolved nature of the B[e] star MWC 137.

MURATORE M.F., KRAUS M., OKSALA M.E., ARIAS M.L., CIDALE L., BORGES FERNANDES M. and LIERMANN A.

Abstract (from CDS):


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Journal keyword(s): circumstellar matter - stars: early-type - stars: emission-line, Be - stars: individual: MWC 137 B The evolutionary phase of B[e] stars is difficult to establish due to the uncertainties in their fundamental parameters. For instance, possible classifications for the Galactic B[e] star MWC 137 include pre-main-sequence and post-main-sequence phases, with a large range in luminosity. 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 MWC 137 is surrounded by a detached cool (T = 1900±100K) and dense (N = (3 +/ - 1) x 1021/cm2) ring of CO gas orbiting the star with a rotational velocity, projected to the line of sight, of 84±2 km/s. We also find that the molecular gas is enriched in the isotope 13C, excluding the classification of the star as a Herbig Be. The observed isotopic abundance ratio (12C/13C = 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 MWC 137, we propose that the supergiant scenario seems to be the most plausible. Hence, we suggest that MWC 137 could be in an extremely short-lived phase, evolving from a B[e] supergiant to a blue supergiant with a bipolar ring nebula.

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 290861A EB* 05 47 07.9122481367 +00 17 56.235172272   11.79 10.61     ~ 45 0
2 HD 290861 Y*O 05 47 07.9128323612 +00 17 56.226520463   11.004 9.954 9.593   F8 50 0
3 EM* MWC 137 Ae* 06 18 45.5220873216 +15 16 52.244494608 12.89 13.30 13.759 11.67 10.31 sgB[e]d 245 1
4 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 765 0
5 [SBW2007] 1 ISM 10 40 19.3815092640 -59 49 09.886785960     12.7     B1Iab 37 1
6 NAME Sher 25 star * 11 15 07.6447245696 -61 15 17.611428348   13.63 12.27     B1.5Iab 79 1
7 WRAY 16-125 PN 13 09 36.2390615830 -61 19 35.976251345   14.508 13.517 13.568   B[e] 127 0
8 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 738 0
9 Min 1-92 pA* 19 36 18.9295687968 +29 32 49.785288144 12.13 12.35 11.75 11.54   B0.5IV[e] 254 0

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