x Ursae Majoris


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 x UMa, ksi UMa, 53 UMa, HR 4374, HD 98230, SAO 62484, WDS 11182+3132B
constellation Ursa Major

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


object is infrared source (uncertain identification)

position, motion, parallax:

position (J2000) RA: 11h 18min 10,9sec DEC: +31 31' 45''
position (J1900) RA: 11h 12min 50,9sec DEC: +32 5' 31''
proper motion (J2000) RA: -0,432 arcsec/a DEC: -0,586 arcsec/a
radial velocity -16 km/s
note: spectroscopic binaries, single lined spectra
note: orbital data avaible
rotational velocity 3 km/s (uncertain) (variable)
trigonometric parallax 0,137 arcsec
note (category: dynamical parallaxes): 0.120".

magnitude

visual magnitude 4,87
(original HR magnitude)

spectral / color information

spectral class G0V
note (category: spectra): Xi UMa B has low lithium abundance while its companion has high.

variability information

variable star identification 5165
note (category: variability): Blend of 4374-5. Amp. 0.03V.

double/multiple star system information

number of components of multiple star system 4
separation 3,1 arcsec
mag difference (of double or brightest multiple) 0,5
component ID AB
note (category: double and multiple data): Binary with HR 4375, q.v.
note (category: spectroscopic binaries): 3.9805d, K 5.0k/s, V0 -15.9k/s, asini 0.274. Unresolved by speckle interferometry 1982.17.

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

position, motion, parallax:

position (J2000) RA: 11h 18min 10,95sec DEC: +31 31' 45,6'' 0,76 arcsec source: 18
proper motion (J2000) RA: -0,0336 arcsec/a DEC: -0,586 arcsec/a source: 25
radial velocity -16 km/s source: 25
trigonometric parallax 0,137 0,014 arcsec source: 25
galactic coord. (B1950) longitude: 195,09 latitude: 69,25
GCI unit vector (J2000) X: -0,838223 Y: 0,154665 Z: 0,522935

magnitude:

visual 4,79 (observed) source: 25
photovisual 4,9 source: 2
photographic 5,4 source: 2

spectral information:

spectral class G0 source: 29
Morgan-Keenan G2V source: 25
B-magnitude 5,38 0,005 B-V-magnitude 0,59
U-magnitude 5,42 0,009 U-B-magnitude 0,04

variability information:

source of data: 27
variability type 273
var. amplitude 0

double/multiple star system information:

source of data: 19
magnitude difference between brightest and second brightest component 0,5

component magnitude spectral class catalogue(s)/name(s)
A 4,32 G0 Alula Australis, x Ursae Majoris, 53 UMa, HR 4375, HD 98231, SAO 62484
B 4,79 G0 x Ursae Majoris, 53 UMa, HR 4374, HD 98230, SAO 62484

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
18 Hipparcos Input Catalog Version 2 Annex
Turon, C., et al., "The Hipparcos Input Catalog, Version 2," Centre de Donnees Stellaires Information Bulletin, Vol. 43, p. 5, 1993
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
27 Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
29 SAOJ2000
SAO on FK5 at J2000, 1989

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

position and proper motion:

position (J1950) RA: 11h 15min 31,162sec DEC: +31 48' 38,88'' 0,011 arcsec
position (J2000) RA: 11h 18min 10,938sec DEC: +31 31' 45,24''
proper motion J1950 (FK4) RA: -0,0339 arcsec/a DEC: -0,591 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0338 arcsec/a DEC: -0,586 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,9 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

spectral class G0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue GC, catalogue number: 15537
Durchmusterung BD+32 2132
Boss General Catalogue 15537
Henry Draper Catalogue 98230
The "SAO Catalog" entry refers to two consecutive HD numbers, the lower of which is given.

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

position and proper motion:

position (J2000) RA: 11h 18,2min DEC: +31 32'
proper motion (J2000) RA: -0,428 arcsec/a DEC: -0,592 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
- 1826 often '' 4,4 4,9 G0V G5V STF1523
Bb 1988 1 104 0,1'' 4,4 - - CHR 178
AC 1990 1 314 54,3'' 4,4 15 - POP

discoverer information:

discoverer code discoverer reference
STF1523 Struve, F.G.W. -
CHR 178 - -
POP Popovic, G.

notes:

note Xi UMa. P = 59.8yr., a = 2.53", motion retrograde. A is known to have an unseen companion, P = 1.83yr. B is a spectroscopic binary.

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

position:

position (J1950) RA: 11h 15min 31,2sec DEC: +31 48' 39''

variability informations:

variability type RS eruptive variable star
magnitute at max. brightness 4,38
magnitute amplitude 0,01
photometric system visual, photovisual or Johnson's V

references

to a study K.G.Strassmeier, D.S.Hall, L.J.Boyd, R.M.Genet, ApJ Suppl 69,141,1989.
to a chart/photograph no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue 83/9014
constellation Ursa Major
notes on existence The star is equivalent to '70083'.

variability type description

variability type description
RS Eruptive variables of the RS Canum Venaticorum type. This type is ascribed to close binary systems with spectra showing Ca II H and K in emission, their components having enhanced chromospheric activity that causes quasi-periodic light variability. The period of variation is close to the orbital one, and the variability amplitude is usually as great as 0.2 mag in V (UX Ari). They are X-ray sources and rotating variables. RS CVn itself is also an eclipsing system.