2012MNRAS.427L..80T

Query : 2012MNRAS.427L..80T

2012MNRAS.427L..80T - Mon. Not. R. Astron. Soc., 427, L80-L84 (2012/November-3)

Discovery of Raman-scattered lines in the massive luminous emission-line star LHA 115-S 18.

TORRES A.F., KRAUS M., CIDALE L.S., BARBA R., BORGES FERNANDES M. and BRANDI E.

Abstract (from CDS):

LHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Located in the Small Magellanic Cloud, its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, C IV, He II) in the ultraviolet and optical regions to molecular emission bands of CO and TiO in the optical and infrared regions. The most distinguishing spectral characteristic of LHA 115-S 18 is the high variability detected in the He IIλ4686 emission line, which can be a very conspicuous or completely invisible feature.

In this work, we report on another peculiarity of LHA 115-S 18. From high-resolution optical spectra taken between 2000 and 2008, we discovered the appearance and strengthening of two emission features at λλ6825 and 7082 Å, which we have identified as Raman-scattered lines. This is the first time that these lines have been detected in the spectrum of a massive luminous B[e] star. As the classification of LHA 115-S 18 is highly controversial, we discuss how the discovery of the appearance of Raman-scattered lines in this peculiar star might help us to solve this puzzle.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): circumstellar matter - stars: individual: LHA 115-S 18 - stars: massive - stars: peculiar - supergiants

Simbad objects: 4

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Number of rows : 4
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 LHA 115-S 18 s*b 00 54 09.5410003368 -72 41 43.289017440 12.94 13.48 13.82   12.55 BI[e] 93 1
3 HD 37974 s*b 05 36 25.8534763728 -69 22 55.789571064 10.056 11.12 10.99 11.00 10.423 B0.5e 132 0
4 V* AG Dra Sy* 16 01 41.0120557968 +66 48 10.135056672 11.50 11.06 9.74 8.52   K3IIIep 520 0

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