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R85

R85
Eso9931d.jpg
The nebula N119; R85 is the brightest of the small triangle of stars in the lower right "arm".
Credit: ESO
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 05h 17m 56.076s
Declination −69° 16′ 03.77″
Apparent magnitude (V) 10.84(10.65 - 10.80)
Characteristics
Evolutionary stage LBV
Spectral type B5 Iae
Apparent magnitude (U) 10.28
Apparent magnitude (B) 10.93
Apparent magnitude (V) 10.84
Apparent magnitude (R) 10.53
Apparent magnitude (I) 10.44
Apparent magnitude (J) 10.103
Apparent magnitude (H) 9.980
Apparent magnitude (K) 9.822
U−B color index −0.65
B−V color index +0.09
Variable type LBV
Astrometry
Radial velocity (Rv) 292 km/s
Proper motion (μ) RA: -1.0 mas/yr
Dec.: -2.3 mas/yr
Distance 160,000 ly
(50,000pc)
Absolute magnitude (MV) −8.2 - −8.5
Details
1960 (minimum)
Radius 135 R
Luminosity 350,000 L
Temperature 13,500 K
1983 - 1990 (maximum)
Luminosity 315,000 L
Temperature 10,000 K
Other designations
HD 269321, AAVSO 0518-69B, 2MASS J05175607-6916037, GSC 09162-00359, Sk−69°92
Database references
SIMBAD data

R85 (or RMC 85, after the Radcliffe Observatory Magellanic Clouds catalog) is a luminous blue variable located in the LH-41 OB association in the Large Magellanic Cloud.

R85 has been shown to vary erratically in brightness with an amplitude of about 0.3 magnitudes. It shows variations on several timescales, sometimes with a distinct 400 day period. It has also shown temperature changes associated with brightness changes over several years, a characteristic of Luminous Blue Variables.

Based on R85's current properties and evolutionary models, it probably started out with an initial mass of 28 M. It is theorized to be making a bubble known as DEM L132a with its stellar wind in the nebula LHA-120 N119, along with S Doradus. It has an infrared excess consistent with a stellar wind contribution.


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Wikipedia

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