1997A&A...326..143H


Query : 1997A&A...326..143H

1997A&A...326..143H - Astronomy and Astrophysics, volume 326, 143-154 (1997/10-1)

The LMC transition star R 84 and the core of the LH 39 OB association.

HEYDARI-MALAYERI M., COURBIN F., RAUW G., ESSLINGER O. and MAGAIN P.

Abstract (from CDS):

On the basis of sub-arcsecond imaging obtained at the ESO NTT with SUSI and the ESO ADONIS adaptive optics system at the 3.6m telescope, we resolve and study the core components of the LMC OB association LH 39. The central star of the association, the rare transition object R 84, is also investigated using CASPEC echelle spectroscopy at the ESO 3.6m telescope. A new, powerful image restoration code that conserves the fluxes allows us to obtain the magnitudes and colors of the components. We bring out some 30 stars in a ∼16"x16" area centered on R 84. At a resolution of 0.19"(FWHM), the closest components to R 84 are shown to be stars #21 and #7 lying at 1.1"NW and 1.7"NW respectively of the transition star. The former is possibly a blue star of V=16.7mag and the latter with its V=17.5mag is the reddest star of the field, after R 84. Star #7 turns out to be too faint to correspond to the red M2 supergiant previously reported to contaminate the spectrum of R 84. If the late-type spectrum is due to a line-of-sight supergiant with a luminosity comparable to R 84, it should lie closer than 0.12" to R 84. The transition star shows spectral variability between 1982 and 1991. We also note some slight radial velocity variations of the Of emission lines over timescales of several years. Furthermore, we derive the spectral types of two of the brightest stars of the cluster, using long slit spectra obtained at the NTT telescope equipped with EMMI, and discuss the apparent absence of O type stars in this association.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - stars: individual: R 84 (LMC) = RGC 84 - stars: early-type - galaxies: Magellanic Clouds - associations: LH 39 (LMC) - techniques: processing

Simbad objects: 7

goto View the references in ADS

Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LH 39 As* 05 13 49.410 -69 32 42.76   10.89 10.86     ~ 24 0
2 HD 269227 WR* 05 13 54.2756276088 -69 31 46.665067440 11.429 11.98 11.918 12.13 10.557 WN9/10+M2Ia 156 0
3 DEM L 110 HII 05 14 01.8 -69 31 55           ~ 18 0
4 SHV 0515481-680111 C* 05 15 39.6298827192 -67 57 58.488139980   13.85 16.51 14.318 14.356 C 13 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16002 1
6 LHA 120-S 125 WR* 05 35 54.3748881672 -68 59 07.890914940 12.463 13.324 13.266 13.33 12.609 WN9ha 69 0
7 W61 3-8 WR* 05 38 58.0963884840 -69 29 19.558532292       12.51 12.43 WN9h 50 0

To bookmark this query, right click on this link: simbad:objects in 1997A&A...326..143H and select 'bookmark this link' or equivalent in the popup menu


2022.05.29-05:01:15

© Université de Strasbourg/CNRS

    • Contact