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

BK Cam, HR 985, HD 20336, SAO 12704, BD +65 340, WDS 03200+6539

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

position, motion, parallax:

position (J2000)	RA: 3h 19min 59.4sec	DEC: +65° 39' 8''
position (B1900)	RA: 3h 11min 11.1sec	DEC: +65° 17' 12''
proper motion (J2000)	RA: 0.015 arcsec/a	DEC: -0.013 arcsec/a
radial velocity	-3 km/s note: spectroscopic binaries
rotational velocity	351 km/s (uncertain) (variable)
trigonometric parallax	0.009 arcsec
galactic coordinates	longitude: 137.46°	latitude: 7.06°

magnitude

visual magnitude

4.84 (V on UBV Johnson system)

spectral / color information

spectral class	B2.5Ven
B-V-magnitude	-0.15
U-B-magnitude	-0.77
R-I-magnitude

note (category: spectra):

Shell star.

variability information

variable star identification

BK Cam

note (category: variability):

Gamma Cas, 4.78 - 4.89V. Spectrum var. 4.5y from 1916 to 1931, previously longer cycles, but no changes noted after 1937. R-I also found at -0.03 and -0.05.

double/multiple star system information

separation	120.9 arcsec
mag difference (of double or brightest multiple)	7.7
note	Worley (1978) update of the IDS

note (category: double and multiple data):

Probably optical.

note (category: spectroscopic binaries):

4.5y.

miscellaneous information

note (category: group membership):

Cas-Tau OB1.

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

position, motion, parallax:

position (J2000)	RA: 3h 19min 59.238sec	DEC: +65° 39' 8.37''	±0.35 arcsec	source: 17
proper motion (J2000)	RA: 0.001 arcsec/a	DEC: -0.014 arcsec/a		source: 25
radial velocity	-3 km/s			source: 25
trigonometric parallax	0.009 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 137.46°	latitude: 7.06°

magnitude:

visual	4.761 (observed)	source: 31
photovisual	4.8	source: 2
photographic	4.6	source: 16

spectral information:

spectral class	B3		source: 96
Morgan-Keenan	B2.5Ven		source: 25
B-magnitude	4.69 ±0.05	B-V-magnitude	-0.15
U-magnitude	3.92 ±0.05	U-B-magnitude	-0.77

variability information:

source of data: 30

variability type	264
var. amplitude	0.11

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	120.9 arcsec
magnitude difference between brightest and second brightest component	7.7
position angle	58 °

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
16	PPM North and PPM South Catalogs and PPM Supplement
Roser, S., and U. Bastian, "Catalogue of Positions and Proper Motions," A&AS, Vol. 74, p. 449, 1988, and Bastian, U., et al., "Catalogue of Positions and Proper Motions - South," 1993
17	ACRS
Corbin, T.E., and S.E. Urban, Astrographic Catalog Reference Stars, United States Naval Observatory, 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
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: 3h 15min 33.792sec	DEC: +65° 28' 17.72''	±0.015 arcsec
position (J2000)	RA: 3h 19min 59.354sec	DEC: +65° 39' 8.48''
proper motion B1950 (FK4)	RA: 0.0028 arcsec/a	DEC: -0.008 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0024 arcsec/a	DEC: -0.013 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.8 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B3p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 3947
Durchmusterung	BD+65 340
Boss General Catalogue	3947
Henry Draper Catalogue	20336

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

position and proper motion:

position (J2000)	RA: 3h 20min	DEC: +65° 39'
proper motion (J2000)	RA: 0.006 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
-	1911	2	58°	121.5''	4.84	12.5	B2.5Vne	BUP 43
	1959		-	120.9''

discoverer information:

discoverer code	discoverer	reference
BUP 43	-	-

notes:

note	Shell star. Light and spectrum variable, BK Cam. May also be a long-period spectroscopic binary.

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

position:

position (equinox 1950.0)

RA: 3h 15min 33.8sec

DEC: +65° 28' 18''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	4.78
magnitute at min. brightness	4.89
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B2Ve

references

to a chart/photograph

no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	11/88
constellation	Camelopardalis
notes on existence	The star is equivalent to '0110089 BL'.
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.