catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names	m Cen, mu Cen, HR 5193, HD 120324, SAO 224471, CD -41 8172, FK5: 508, WDS 13496-4228
constellation	Centaurus

data from The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version) (Hoffleit+, 1991)

position, motion, parallax:

position (J2000)	RA: 13h 49min 37sec	DEC: -42° 28' 26''
position (B1900)	RA: 13h 43min 35.4sec	DEC: -41° 58' 32''
proper motion (J2000)	RA: -0.023 arcsec/a	DEC: -0.02 arcsec/a
radial velocity	9 km/s note: spectroscopic binaries
rotational velocity	175 km/s (uncertain) (variable)
galactic coordinates	longitude: 314.24°	latitude: 19.12°

magnitude

visual magnitude

3.04 (V on UBV Johnson system)

spectral / color information

spectral class	B2IV-Ve
B-V-magnitude	-0.17
U-B-magnitude	-0.72
R-I-magnitude

note (category: spectra):

Shell star. Line profiles of MgII 4481 change in period 0.505d, about five times the period of weaker absorption features.

variability information

variable star identification

Mu Cen

note (category: variability):

Gamma Cas 2.92 - 3.43V, 3.535d. Variable H alpha. Expanding circumstellar shell. R and I mags. decreased by about 0.3m between 1965 and 1983. Variable line profiles.

double/multiple star system information

separation	48 arcsec
mag difference (of double or brightest multiple)	10.7
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Companion F2V, optical.

miscellaneous information

note (category: group membership):

Sco-Cen cluster; upper Cen group of Sco-Cen assoc.

data from SKY2000 - Master Star Catalog (Myers+ 1997)

position, motion, parallax:

position (J2000)	RA: 13h 49min 36.993sec	DEC: -42° 28' 25.53''	±0.06 arcsec	source: 15
proper motion (J2000)	RA: -0.0021 arcsec/a	DEC: -0.02 arcsec/a		source: 25
radial velocity	9 km/s			source: 25
galactic coord. (B1950)	longitude: 314.25°	latitude: 19.12°

magnitude:

visual	2.92 (observed)	source: 30
photovisual	3.3	source: 2
photographic	3.1	source: 2

spectral information:

spectral class	B2		source: 96
Morgan-Keenan	B2IV-Ve		source: 25
B-magnitude	2.87 ±0.05	B-V-magnitude	-0.17
U-magnitude	2.15 ±0.05	U-B-magnitude	-0.72

variability information:

source of data: 30

variability type	264
var. amplitude	0.55

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	48 arcsec
magnitude difference between brightest and second brightest component	10.69
position angle	128 °

sources:

2	HD and HDE Catalogs
Cannon, A.J., and E.C. Pickering, Harvard Annals, Vols 91-99, 1918-24, Cambridge, Massachusetts: Harvard University; Cannon, A.J., Harvard Annals, Vol. 100, 1925-36, Cambridge, Massachusetts: Harvard University; and Cannon, A.J., and M. Walton Mayall, Harvard Annals, Vol. 112, 1949, Cambridge, Massachusetts: Harvard University
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
25	Bright Star Catalogue, 5th edition
Hoffleit, D. and Warren, W.H. Jr., The Bright Star Catalogue, 5th Revised Edition, Version 2, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 13h 46min 35.658sec	DEC: -42° 13' 31.64''	±0.01 arcsec
position (J2000)	RA: 13h 49min 37.015sec	DEC: -42° 28' 25.71''
proper motion B1950 (FK4)	RA: -0.002 arcsec/a	DEC: -0.026 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0018 arcsec/a	DEC: -0.022 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.3 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B2p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 508
Durchmusterung	CD-41 8172
Boss General Catalogue	18667
Henry Draper Catalogue	120324

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 13h 49.6min	DEC: -42° 28'
proper motion (J2000)	RA: -0.023 arcsec/a	DEC: -0.02 arcsec/a

double/multiple star system information:

component	year	number of measures	position angle	angular separation	magnitude of 1st component	magnitude of 2nd component	spectral class(es)	discoverer code
-	1897	2	128°	48''	2.94	13.63	B2IV-Ve	HDO 226

discoverer information:

discoverer code	discoverer	reference
HDO 226	-	-

notes:

note	Mu Cen. A is an irregular variable.

data from Combined General Catalogue of Variable Stars (Vol. I-III) (Kholopov+ 1998)

position:

position (equinox 1950.0)

RA: 13h 46min 35.7sec

DEC: -42° 13' 32''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	2.92
magnitute at min. brightness	3.47
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B2IV-Ve

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue	19/9012
constellation	Centaurus
notes on existence	The star is equivalent to '0199013 nu'.
There are notes in published catalog.

variability type description

variability type	description
GCAS	Eruptive irregular variables of the Gamma Cas type. These are rapidly rotating B III-IVe stars with mass outflow from their equatorial zones. The formation of equatorial rings or disks is often accompanied by temporary fading. Light amplitudes may reach 1.5 mag in V.