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	d Cru, del Cru, HR 4656, HD 106490, SAO 239791, CP -58 4189, FK5: 455
constellation	Crux

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

position, motion, parallax:

position (J2000)	RA: 12h 15min 8.7sec	DEC: -58° 44' 56''
position (2000.72)	RA: 12h 15min 11sec	DEC: -58° 45' 10''
position (B1900)	RA: 12h 9min 49.9sec	DEC: -58° 11' 33''
proper motion (J2000)	RA: -0.041 arcsec/a	DEC: -0.009 arcsec/a
radial velocity	22 km/s note: suspected variable radial velocity
rotational velocity	194 km/s (uncertain) (variable)
trigonometric parallax	0.003 arcsec
galactic coordinates	longitude: 298.23°	latitude: 3.79°

magnitude

visual magnitude

2.8 (V on UBV Johnson system)

spectral / color information

spectral class	B2IV
B-V-magnitude	-0.23
U-B-magnitude	-0.91
R-I-magnitude

variability information

variable star identification

Del Cru

note (category: variability):

Beta C 2.78 - 2.84V, 2.25 - 2.31p, 0.151038d. Expanding circumstellar shell.

miscellaneous information

note (category: group membership):

Probable member of Sco-Cen cluster; lower Cen group of Sco-Cen assoc.

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

position, motion, parallax:

position (J2000)	RA: 12h 15min 8.683sec	DEC: -58° 44' 56.08''	±0.06 arcsec	source: 15
position (2000.72)	RA: 12h 15min 11sec	DEC: -58° 45' 10''	JD: 2451809.17
proper motion (J2000)	RA: -0.0053 arcsec/a	DEC: -0.009 arcsec/a		source: 25
radial velocity	22 km/s			source: 25
trigonometric parallax	0.003 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 298.23°	latitude: 3.79°

magnitude:

visual	2.78 (observed)	source: 30
photovisual	3.1	source: 2
photographic	2.9	source: 2

spectral information:

spectral class	B3		source: 96
Morgan-Keenan	B2IV		source: 25
B-magnitude	2.57 ±0.05	B-V-magnitude	-0.23
U-magnitude	1.66 ±0.05	U-B-magnitude	-0.91

variability information:

source of data: 30

variability type	140
var. amplitude	0.06
var. period	0.15

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
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: 12h 12min 28.6sec	DEC: -58° 28' 14.8''	±0.009 arcsec
position (2000.72)	RA: 12h 15min 12sec	DEC: -58° 45' 10''	JD: 2451809.17
position (J2000)	RA: 12h 15min 8.675sec	DEC: -58° 44' 55.81''
proper motion B1950 (FK4)	RA: -0.0049 arcsec/a	DEC: -0.01 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0053 arcsec/a	DEC: -0.006 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B3
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 455
Durchmusterung	CP-58 4189
Boss General Catalogue	16724
Henry Draper Catalogue	106490

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

position:

position (equinox 1950.0)

RA: 12h 12min 28.6sec

DEC: -58° 28' 15''

variability informations:

variability type	BCEP	pulsating variable star
magnitute at max. brightness	2.78
magnitute at min. brightness	2.84
photometric system	visual, photovisual or Johnson's V
period [d]	0.151038
rising time	40 % of period

spectral information

spectral class

B2IV

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 'Cape Photographic Durchmusterung'

miscanellous

ID in the GCVS catalogue	30/9004
constellation	Crux
notes on existence	The star is equivalent to '03090082tet 2'.

variability type description

variability type

description

BCEP

Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.