a Circini

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 a Cir, alf Cir, HR 5463, HD 128898, SAO 252853, FK5: 539, WDS 14425-6459
constellation Circinus

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


position, motion, parallax:

position (J2000) RA: 14h 42min 30,4sec DEC: -64° 58' 31''
position (J1900) RA: 14h 34min 25,2sec DEC: -64° 32' 23''
proper motion (J2000) RA: -0,192 arcsec/a DEC: -0,232 arcsec/a
radial velocity 7 km/s
note: spectroscopic binaries
rotational velocity 0 km/s (uncertain) (variable)
trigonometric parallax 0,056 arcsec
note (category: dynamical parallaxes): 0.074".

magnitude

visual magnitude 3,19
(V on UBV Johnson system)

spectral / color information

spectral class ApSrEuCr:
B-V-magnitude 0,24
U-B-magnitude 0,12
R-I-magnitude 0,1
note (category: spectra): Also classified F1Vp.

variability information

variable star identification Alp Cir
note (category: variability): Amp. 0.03V. Magnetic var., about 4 months. Pulsation period 6.8 min?

double/multiple star system information

separation 15,6 arcsec
mag difference (of double or brightest multiple) 5,4
note Worley (1978) update of the IDS
note (category: double and multiple data): Binary. Companion K5V.

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

position, motion, parallax:

position (J2000) RA: 14h 42min 30,408sec DEC: -64° 58' 30,51'' ±0,06 arcsec source: 15
proper motion (J2000) RA: -0,0302 arcsec/a DEC: -0,232 arcsec/a source: 25
radial velocity 7 km/s source: 25
trigonometric parallax 0,056 ±0,006 arcsec source: 25
galactic coord. (B1950) longitude: 314,34° latitude: -4,59°
GCI unit vector (J2000) X: -0,321052 Y: -0,275435 Z: -0,906124

magnitude:

visual 3,19 (observed) source: 25
photovisual 3,4 source: 2
photographic 3,7 source: 2

spectral information:

spectral class F0 source: 96
Morgan-Keenan ApSrEuCr: source: 25
B-magnitude 3,43 ±0,05 B-V-magnitude 0,24
U-magnitude 3,55 ±0,05 U-B-magnitude 0,12

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 15,6 arcsec
magnitude difference between brightest and second brightest component 5,29
position angle 227 °

component magnitude spectral class catalogue(s)/name(s)
A 3,19 F0 a Circini, HR 5463, HD 128898, SAO 252853
B 8,46 -

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
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: 14h 38min 26,38sec DEC: -64° 45' 32,38'' ±0,014 arcsec
position (J2000) RA: 14h 42min 30,397sec DEC: -64° 58' 30,7''
proper motion J1950 (FK4) RA: -0,0291 arcsec/a DEC: -0,238 arcsec/a ±0,004 arcsec/a in RA
±0,003 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0303 arcsec/a DEC: -0,234 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,4 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 539
Durchmusterung CP-64 2977A
Boss General Catalogue 19772
Henry Draper Catalogue 128898

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

position and proper motion:

position (J2000) RA: 14h 42,5min DEC: -64° 59'
proper motion (J2000) RA: -0,192 arcsec/a DEC: -0,232 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
- 1837 29 244° 15,6'' 3,18 8,47 ApSrEuCr: DUN 166
1990 227° -

discoverer information:

discoverer code discoverer reference
DUN 166 Dunlop, J. -

notes:

note Alpha Cir. Probably variable.

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

position:

position (J1950) RA: 14h 38min 26,4sec DEC: -64° 45' 32''

variability informations:

variability type ACVO rotating variable star
magnitute at max. brightness 3,18
magnitute at min. brightness 3,21
photometric system visual, photovisual or Johnson's V

references

to a study D.W.Kurtz, M.S.Cropper, IBVS No.1987,1981.
to a chart/photograph no chart is avaible, but the star is contained in the 'Cape Photographic Durchmusterung'

miscanellous

ID in the GCVS catalogue 23/9001
constellation Circinus
notes on existence The star is equivalent to '67321'.

variability type description

variability type description
ACVO Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields.
Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V.

ACVO
Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.