catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

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

catalogues and names

catalogues and names	w CMa, ome CMa, 28 CMa, HR 2749, HD 56139, SAO 173282, CD -26 4073
constellation	Canis Major

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

position, motion, parallax:

position (J2000)	RA: 7h 14min 48.7sec	DEC: -26° 46' 22''
position (B1900)	RA: 7h 10min 45.2sec	DEC: -26° 35' 56''
proper motion (J2000)	RA: -0.008 arcsec/a	DEC: 0.006 arcsec/a
radial velocity	26 km/s note: spectroscopic binaries
rotational velocity	120 km/s (uncertain) (variable)
galactic coordinates	longitude: 239.41°	latitude: -7.15°

note (category: radial and/or rotational velocities):

+22 to -10k/s change in 0.2d. Expanding circumstellar shell. Pole on. 1.36d period.

magnitude

visual magnitude

3.85 (V on UBV Johnson system)

spectral / color information

spectral class	B2IV-Ve
B-V-magnitude	-0.17
U-B-magnitude	-0.73
R-I-magnitude

variability information

variable star identification

Ome CMa

note (category: variability):

Gamma Cas 3.60 - 4.18V, cycles 20 - 22 hrs. Also amp. 0.06V on time scale of 5d reported. Hydrogen emission varies with period 1.3667d (possibly a rotation period).

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

position, motion, parallax:

position (J2000)	RA: 7h 14min 48.685sec	DEC: -26° 46' 21.75''	±0.19 arcsec	source: 16
proper motion (J2000)	RA: -0.0009 arcsec/a	DEC: 0.001 arcsec/a		source: 25
radial velocity	26 km/s			source: 25
galactic coord. (B1950)	longitude: 239.41°	latitude: -7.15°

magnitude:

visual	3.6 (observed)	source: 30
photovisual	3.8	source: 2
photographic	3.7	source: 2

spectral information:

spectral class	B3		source: 96
Morgan-Keenan	B2IV-Ve		source: 25
B-magnitude	3.68 ±0.05	B-V-magnitude	-0.17
U-magnitude	2.95 ±0.05	U-B-magnitude	-0.73

variability information:

source of data: 30

variability type	264
var. amplitude	0.58

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
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 (B1950)	RA: 7h 12min 46.891sec	DEC: -26° 41' 5.01''	±0.024 arcsec
position (J2000)	RA: 7h 14min 48.677sec	DEC: -26° 46' 21.84''
proper motion B1950 (FK4)	RA: -0.0009 arcsec/a	DEC: 0.004 arcsec/a	±0.004 arcsec/a in RA ±0.005 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0006 arcsec/a	DEC: 0.006 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.8 (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: 9625
Durchmusterung	CD-26 4073
Boss General Catalogue	9625
Henry Draper Catalogue	56139

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

position:

position (equinox 1950.0)

RA: 7h 12min 46.9sec

DEC: -26° 41' 5''

variability informations:

variability type	GCAS	eruptive variable star
magnitute at max. brightness	3.6
magnitute at min. brightness	4.18
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B2IV-Ve

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue	14/9024
constellation	Canis Major
notes on existence	The star is equivalent to '0150001 R'.
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.