2020ApJ...888...54M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET21:14:03

2020ApJ...888...54M - Astrophys. J., 888, 54-54 (2020/January-2)

Discovery of a rare late-type, low-mass Wolf-Rayet star in the LMC.

MARGON B., MANEA C., WILLIAMS R., BOND H.E., PROCHASKA J.X., SZYMANSKI M.K. and MORRELL N.

Abstract (from CDS):

We report the serendipitous discovery of an object, UVQS J060819.93-715737.4, with a spectrum dominated by extremely intense, narrow C II emission lines. The spectrum is similar to those of the very rare, late-type [WC11] low-mass Wolf-Rayet stars. Despite the recognition of these stars as a distinct class decades ago, there remains barely a handful of Galactic members, all of which are also planetary-nebula central stars. Although no obvious surrounding nebulosity is present in J0608, [O II], [N II], and [S II] emission suggest the presence of an inconspicuous, low-excitation nebula. There is low-amplitude incoherent photometric variability on timescales of days to years, as well as numerous prominent P Cygni profiles, implying mass loss. There are indications of a binary companion. The star is located on the outskirts of the LMC, and the observed radial velocity (∼+250 km s–1) and proper motion strongly suggest membership. If indeed an LMC member, this is the first extragalactic late [WC] star, and the first with an accurately determined luminosity, as the Galactic examples are too distant for precise parallax determinations. A high-quality, broad-coverage spectrum of the prototype of the late [WC] class, CPD -56° 8032, is also presented. We discuss different excitation mechanisms capable of producing the great strength of the C II emission. Numerous autoionizing levels of C II are definitely populated by processes other than dielectronic recombination. Despite the spectacular emission spectra, observational selection makes objects such as these difficult to discover. Members of the [WC11] class may in fact be considerably more common than the handful of previously known late [WC] stars.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): WC stars - Planetary nebulae nuclei - Planetary nebulae

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PN M 4-18 PN 04 25 50.8357219366 +60 07 12.778708522   14.22 13.96     [WC11] 170 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14998 1
3 IC 418 PN 05 27 28.2060343141 -12 41 50.282659007   9.78 13.0     O7fp 1004 2
4 SV* HV 2671 RC* 05 33 48.935 -70 13 23.43     15.758   15.391 ~ 29 1
5 IRAS 05588-6944 AB* 05 58 25.9829797087 -69 44 25.826081013           ~ 17 0
6 MGPN LMC 86 PN 06 04 58.6 -72 03 54 19.435 20.804 20.242     ~ 7 0
7 IRAS 06091-7157 * 06 08 19.9375378691 -71 57 37.448263893           ~ 2 0
8 WRAY 15-1269 PN 14 59 53.4814028450 -54 18 07.524725528 12.12 12.17 11.64 11.63   [WC11] 229 0
9 CPD-56 8032 PN 17 09 00.86008 -56 54 48.0957 11.24 11.48 11.04     [WC10] 250 0
10 V* V348 Sgr pA* 18 40 19.9270532749 -22 54 29.388019146   12.1       B0/1?I?e 174 0
11 HD 184738 PN 19 34 45.2337512278 +30 30 58.951476338   10.41 10.44     [WC9] 922 0
12 [D75b] Em* 21-021 PN 21 29 58.4712776885 +51 04 00.323547316   15.66 14.20 13.89   O7(f)/[WC11] 227 0
13 NAME Local Group GrG ~ ~           ~ 7076 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-21:14:03

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