2007ApJ...660.1480M

Query : 2007ApJ...660.1480M

2007ApJ...660.1480M - Astrophys. J., 660, 1480-1485 (2007/May-2)

Pismis 24-1: the stellar upper mass limit preserved.

MAIZ-APELLANIZ J., WALBORN N.R., MORRELL N.I., NIEMELA V.S. and NELAN E.P.

Abstract (from CDS):

Is there a stellar upper mass limit? Recent statistical work seems to indicate that there is and that it is in the vicinity of 150 M☉. In this paper we use HST and ground-based data to investigate the brightest members of the cluster Pismis 24, one of which (Pismis 24-1) was previously inferred to have a mass greater than 200 M☉, in apparent disagreement with that limit. We determine that Pismis 24-1 is composed of at least three objects, the resolved Pismis 24-1SW and the unresolved spectroscopic binary Pismis 24-1NE. The evolutionary zero-age masses of Pismis 24-1SW, the unresolved system Pismis 24-1NE, and the nearby star Pismis 24-17 are all ~100 M☉, very large but under the stellar upper mass limit.

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Journal keyword(s): Stars: Binaries: Close - Stars: Early-Type - Stars: Fundamental Parameters - stars: individual (Pismis 24-17) - stars: individual (Pismis 24-1NW (read: NAME Cl Pismis 24-1NE)) - stars: individual (Pismis 24-1SE (read: NAME Cl Pismis 24-1SW))

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Trumpler 14 OpC 10 43 56.0 -59 33 07   5.70 5.5     ~ 547 0
2 Cl Pismis 24 OpC 17 24 43.0 -34 12 23           ~ 130 0
3 HD 319718 ** 17 24 43.490 -34 11 57.03 12.28 11.94 10.44 10.05   O3.5If* 92 0
4 NGC 6357 OpC 17 24 44 -34 12.2           ~ 303 0
5 Cl Pismis 24 17 Y*O 17 24 44.7309068928 -34 12 02.698328196 13.61 13.33 11.84 11.35 9.61 O3.5III(f*) 47 0

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