AW Ursae Majoris

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

position, motion, parallax:

position (J2000)	RA: 11h 30min 4.313sec	DEC: +29° 57' 52.74''	ą0.22 arcsec	source: 15
position (2000.73)	RA: 11h 30min 6sec	DEC: +29° 57' 38''	JD: 2451810.11
proper motion (J2000)	RA: -0.0065 arcsec/a	DEC: -0.196 arcsec/a		source: 15
radial velocity	-15 km/s			source: 26
trigonometric parallax	0.014 arcsec		ą0.001 arcsec	source: 15
galactic coord. (B1950)	longitude: 199.11°	latitude: 71.93°

magnitude:

visual	6.8 (observed)	source: 31
photovisual	6.8	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	A9n		source: 26
B-magnitude	7.19 ą0.2	B-V-magnitude	0.35
U-magnitude	7.29 ą0.018	U-B-magnitude	0

variability information:

source of data: 30

variability type	10
var. amplitude	0.3
var. period	0.44
var. epoch	2444665 1. March 1981, 12:00:00 UT
next max light	2451810.16 22. September 2000, 15:50:24 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	67 arcsec
magnitude difference between brightest and second brightest component	2.62
position angle	33 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	6.8	F0
B	9.47	G5

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
26	Bright Star Supplement
Hoffleit, D. and Warren, W.H. Jr., A Supplement to the Bright Star Catalogue, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31	CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 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 (B1950)	RA: 11h 27min 25.569sec	DEC: +30° 14' 35.19''	ą0.027 arcsec
position (2000.73)	RA: 11h 30min 7sec	DEC: +29° 57' 48''	JD: 2451810.11
position (J2000)	RA: 11h 30min 4.206sec	DEC: +29° 57' 52.51''
proper motion B1950 (FK4)	RA: -0.0077 arcsec/a	DEC: -0.203 arcsec/a	ą0.007 arcsec/a in RA ą0.006 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0076 arcsec/a	DEC: -0.198 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	6.8 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

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

catalogues

source catalogue	GC, catalogue number: 15772
Durchmusterung	BD+30 2163
Boss General Catalogue	15772
Henry Draper Catalogue	99946

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

position and proper motion:

position (J2000)	RA: 11h 30.1min	DEC: +29° 58'
proper motion (J2000)	RA: -0.085 arcsec/a	DEC: -0.196 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
-	1875	5	33°	67''	6.84	9.46	A9n	STT 111

discoverer information:

discoverer code	discoverer	reference
STT 111	Struve, O.	-

notes:

note	LDS 5730. B is BD+30@2164. The primary is the eclipsing pair AW UMa, P = 0.44d. Proper motion of B -092 -204.

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

position:

position (equinox 1950.0)

RA: 11h 27min 25.6sec

DEC: +30° 14' 35''

variability informations:

variability type	EW/KW	close binary eclipsing system
magnitute at max. brightness	6.83
magnitute at min. brightness	7.13
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2444664.7993 1. March 1981, 07:11:00 UT
period [d]	0.4387299
next maximum light [JD]	2451810.3931813 22. September 2000, 21:26:11 UT

spectral information

spectral class

F0-F2

references

to a study	the main characteristics of the star was determined by the authors themselves
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	83/76
constellation	Ursa Major
notes on existence	The star is equivalent to '0830077 AX'.
There are notes in published catalog.

variability type description

variability type	description
EW	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
KW	Contact systems of the W UMa type, with ellipsoidal components of F0-K spectral type. Primary components are main-sequence stars and secondaries lie below and to the left of the main sequence in the (MV,B-V) diagram.