1997A&A...322..554H


Query : 1997A&A...322..554H

1997A&A...322..554H - Astronomy and Astrophysics, volume 322, 554-564 (1997/6-2)

The puzzling luminous blue variable-like object HD 5980 in the Small Magellanic Cloud.

HEYDARI-MALAYERI M., RAUW G., ESSLINGER O. and BEUZIT J.-L.

Abstract (from CDS):

We have observed the exceptional SMC star HD 5980 during several runs from 1989 to 1995 at ESO La Silla. CASPEC at the 3.6m telescope and EMMI in echelle and long slit modes at NTT were used for spectroscopy. Sub-arcsecond images were obtained using SUSI at NTT and also an adaptive optics system at the 3.6m telescope. In all our spectra taken before 1994 September HD 5980 shows a spectral type of WN6. The 1994 September spectra were taken shortly after the maximum of the visual light-curve of the LBV-like phenomenon (Bateson & Jones, 1993PVSS...19...50B) and about one month before the observations of Barba et al. (1995ApJ...446L..23B). Near maximum visual brightness, HD 5980 displays a WN11-like spectrum with the HeI lines and the Balmer lines Hδ and Hγ showing well-developed PCyg profiles. The sub-arcsecond images (0.17" FWHM), through the near infrared bands J, H, and K, obtained in 1993 and 1996, show no stellar components down to 6.7 mag fainter than HD 5980 in K at a separation of 1.0" and the 3σ level. For a separation of 0.3" this upper bound is 4.1mag fainter than HD 5980. The observed behavior of this object raises serious problems for our comprehension of the LBV phenomenon in the conventional scenarios of massive star evolution. The present observations cover a crucial period in the evolution of HD 5980 and will therefore be helpful for better understanding this peculiar object especially during its outburst as well as the evolution of W-R stars in general.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - stars: individual: HD 5980 - binaries: eclipsing - stars: mass-loss - circumstellar matter - Magellanic Clouds

Simbad objects: 12

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Number of rows : 12
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10194 1
2 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 459 0
3 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 373 1
4 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 225 0
5 HD 6884 s*b 01 07 18.2182685856 -72 28 03.657105156   10.32 10.2     B9Ia0ek 119 0
6 Brey 3a WR* 04 53 30.0791072664 -69 17 49.385662368 13.000 14.398 14.267 14.79 12.791 WC9 37 0
7 HD 269582 WR* 05 27 52.6621673400 -68 59 08.488879836 12.206 10.818 11.093 12.70 11.234 WN10h 99 0
8 HD 269858 s*b 05 36 43.6936418088 -69 29 47.451149232   10.24 10.15 9.95 9.05 LBV 276 2
9 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 319 0
10 WRAY 15-682 WR* 10 53 59.5777329720 -60 26 44.361095316   11.64 10.85 10.56   WN11h 143 3
11 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 611 0
12 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1151 1

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2022.05.22-00:07:44

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