2016MNRAS.459.3068K

Query : 2016MNRAS.459.3068K

2016MNRAS.459.3068K - Mon. Not. R. Astron. Soc., 459, 3068-3077 (2016/July-1)

MN48: a new Galactic bona fide luminous blue variable revealed by Spitzer and SALT.

KNIAZEV A.Y., GVARAMADZE V.V. and BERDNIKOV L.N.

Abstract (from CDS):

In this paper, we report the results of spectroscopic and photometric observations of the candidate evolved massive star MN48 disclosed via detection of a mid-infrared circular shell around it with the Spitzer Space Telescope. Follow-up optical spectroscopy of MN48 with the Southern African Large Telescope (SALT) carried out in 2011-2015 revealed significant changes in the spectrum of this star, which are typical of luminous blue variables (LBVs). The LBV status of MN48 was further supported by photometric monitoring which shows that in 2009-2011 this star has brightened by ≈0.9 and 1 mag in the V and Ic bands, respectively, then faded by ≈1.1 and 1.6 mag during the next four years, and apparently started to brighten again recently. The detected changes in the spectrum and brightness of MN48 make this star the 18th known Galactic bona fide LBV and increase the percentage of LBVs associated with circumstellar nebulae to more than 70 per cent. We discuss the possible birth place of MN48 and suggest that this star might have been ejected either from a putative star cluster embedded in the H ii region IRAS 16455-4531 or the young massive star cluster Westerlund 1.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): line: identification - circumstellar matter - stars: emission-line, Be - stars: evolution - stars: individual: [GKF2010] MN48 - stars: massive - stars: massive

CDS comments: In Table 4 : star 1 is 2MASS J16491564-4539359, star 2 is 2MASS J16491680-4533391.

Simbad objects: 14

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Number of rows : 14
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 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 649 0
2 UCAC2 3729120 s*b 13 36 28.6255407576 -63 45 38.735081280   17.36 15.31 14.87   LBV 7 0
3 WRAY 16-137 s*b 13 50 15.3659574432 -61 48 55.035208620     15.5     LBV 10 0
4 NAME Nor Arm PoG 16 00 -50.0           ~ 485 0
5 EM* VRMF 55 HXB 16 32 39.9402289536 -49 42 13.686446160     15     OB 16 0
6 Cl Westerlund 1 OpC 16 47 02.4 -45 51 07           ~ 655 1
7 Cl* Westerlund 1 W 243 s*b 16 47 07.5040736160 -45 52 29.123491188   19.873 15.730     LBV 67 0
8 IRAS 16455-4531 HII 16 49 11.0 -45 36 36           ~ 12 0
9 2MASS J16491564-4539359 * 16 49 15.650 -45 39 35.96           B1V 1 0
10 DENIS J164916.8-453339 * 16 49 16.8113943240 -45 33 39.145125996           O8V 1 0
11 [GKF2010] MN48 LP* 16 49 37.7028749880 -45 35 59.233622064   17.64 15.83 13.82 10.82 ~ 13 0
12 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
13 * P Cyg s*b 20 17 47.2019733389 +38 01 58.549132671 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1200 1
14 NAME Scutum Spiral Arm PoG ~ ~           ~ 393 0

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