Becrux


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

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


catalogues and names Becrux, b Cru, bet Cru, HR 4853, HD 111123, SAO 240259, FK5: 481, WDS 12477-5941A
other names Mimosa
constellation Crux

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

note (category: star names): Becrux; MIMOSA.

position, motion, parallax:

position (J2000) RA: 12h 47min 43,2sec DEC: -59 41' 19''
position (J1900) RA: 12h 41min 52,5sec DEC: -59 8' 31''
proper motion (J2000) RA: -0,048 arcsec/a DEC: -0,014 arcsec/a
radial velocity 16 km/s
note: spectroscopic binaries
rotational velocity 38 km/s (uncertain) (variable)

magnitude

visual magnitude 1,25
(V on UBV Johnson system)

spectral / color information

spectral class B0.5III
B-V-magnitude -0,23
U-B-magnitude -1
R-I-magnitude -0,26

variability information

variable star identification Bet Cru
note (category: variability): Beta C 1.23 - 1.31V, multiple periods, 0.2365072d, 0.160474d, 0.121383d, 6d, 7 - 8y and others.

double/multiple star system information

number of components of multiple star system 3
separation 371,6 arcsec
mag difference (of double or brightest multiple) 6
component ID AC
note Worley (1978) update of the IDS
note (category: double and multiple data): Interferometer measures indicate close double or multiple star. Component B, 11.4v, F8V, optical; C, 7.5v, B8.
note (category: spectroscopic binaries): 0.1604d, and 7 - 8y.

miscellaneous information

note (category: group membership): Probable member of Sco-Cen cluster; member of Sco-Cen assoc.; member of Pleiades group.
note (category: stellar radii or diameters): Diam. = 0.000702 - 0.000722".

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

position, motion, parallax:

position (J2000) RA: 12h 47min 43,237sec DEC: -59 41' 19,46'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0063 arcsec/a DEC: -0,014 arcsec/a source: 25
radial velocity 16 km/s source: 25
galactic coord. (B1950) longitude: 302,47 latitude: 3,18
GCI unit vector (J2000) X: -0,493796 Y: -0,104331 Z: -0,863296

magnitude:

visual 1,23 (observed) source: 30
photovisual 1,5 source: 2
photographic 1,3 source: 2

spectral information:

spectral class B1 source: 96
Morgan-Keenan B0.5III source: 25
B-magnitude 1,02 0,05 B-V-magnitude -0,23
U-magnitude 0,02 0,05 U-B-magnitude -1

variability information:

source of data: 30
variability type 140
var. amplitude 0,08
var. period 0,24

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 44,3 arcsec
magnitude difference between brightest and second brightest component 10,1
position angle 322

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 (J1950) RA: 12h 44min 47,037sec DEC: -59 24' 56,53'' 0,008 arcsec
position (J2000) RA: 12h 47min 43,293sec DEC: -59 41' 19,34''
proper motion J1950 (FK4) RA: -0,005 arcsec/a DEC: -0,017 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0056 arcsec/a DEC: -0,012 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 1,5 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B1
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 481
Durchmusterung CP-59 4451
Boss General Catalogue 17374
Henry Draper Catalogue 111123

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

position and proper motion:

position (J2000) RA: 12h 47,7min DEC: -59 41'
proper motion (J2000) RA: -0,048 arcsec/a DEC: -0,014 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
AB 1901 1 322 44,3'' 1,25 11,4 B0.5III I 362
AC 1853 1 23 369,9'' 1,25 7,5 B7II DUN 125

discoverer information:

discoverer code discoverer reference
I 362 Innes, R.T.A. -
DUN 125 Dunlop, J. -

notes:

note Beta Cru. A is a Beta CMa-type variable.

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

position:

position (J1950) RA: 12h 44min 47sec DEC: -59 24' 57''

variability informations:

variability type BCEP pulsating variable star
magnitute at max. brightness 1,23
magnitute at min. brightness 1,31
photometric system visual, photovisual or Johnson's V
period [d] 0,2365072

spectral information

spectral class B0.5III-IV

references

to a study Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue 30/9002
constellation Crux
notes on existence The star is equivalent to '0309004 del'.
There are notes in published catalog.

variability type description

variability type description
BCEP Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to
maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.