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	CW Vir, 78 Vir, HR 5105, HD 118022, SAO 120004, BD +4 2764, FK5: 1351
constellation	Virgo

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

position, motion, parallax:

position (J2000)	RA: 13h 34min 7.9sec	DEC: +3° 39' 32''
position (2000.72)	RA: 13h 34min 10sec	DEC: +3° 39' 19''
position (B1900)	RA: 13h 29min 3.8sec	DEC: +4° 10' 21''
proper motion (J2000)	RA: 0.044 arcsec/a	DEC: -0.024 arcsec/a
radial velocity	-12 km/s note: spectroscopic binaries
rotational velocity	15 km/s (uncertain) (variable)
trigonometric parallax	0.021 arcsec
galactic coordinates	longitude: 328.27°	latitude: 64.41°

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

3.7220d.

magnitude

visual magnitude

4.94 (V on UBV Johnson system)

spectral / color information

spectral class	A1pSrCrEu
B-V-magnitude	0.03
U-B-magnitude	0
R-I-magnitude

note (category: spectra):

Oxygen deficient relative to magnesium. Also classified A0VpSrCr.

variability information

variable star identification

CW Vir

note (category: variability):

Alpha CV 4.91 - 4.99V, 3.7220d, also magnetic field and rotation period. Probable irregular magnetic variable.

miscellaneous information

note (category: group membership):

Sirius group; UMa stream.

note (category: stellar radii or diameters):

Radius relative to Sun = 2.4.

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

position, motion, parallax:

position (J2000)	RA: 13h 34min 7.932sec	DEC: +3° 39' 32.12''	±0.06 arcsec	source: 15
position (2000.72)	RA: 13h 34min 10sec	DEC: +3° 39' 19''	JD: 2451809.25
proper motion (J2000)	RA: 0.003 arcsec/a	DEC: -0.024 arcsec/a		source: 25
radial velocity	-12 km/s			source: 25
trigonometric parallax	0.021 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 328.28°	latitude: 64.41°

magnitude:

visual	4.9 (observed)	source: 31
photovisual	4.9	source: 2

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A1pSrCrEu		source: 25
B-magnitude	4.97 ±0.05	B-V-magnitude	0.03
U-magnitude	4.97 ±0.05	U-B-magnitude	0

variability information:

source of data: 30

variability type	160
var. amplitude	0.08
var. period	3.72
var. epoch	2434817 15. March 1954, 12:00:00 UT
next max light	2451809.96 22. September 2000, 11:02:24 UT

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
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: 13h 31min 35.762sec	DEC: +3° 54' 54.36''	±0.006 arcsec
position (2000.72)	RA: 13h 34min 10sec	DEC: +3° 39' 20''	JD: 2451809.25
position (J2000)	RA: 13h 34min 7.933sec	DEC: +3° 39' 32.02''
proper motion B1950 (FK4)	RA: 0.0028 arcsec/a	DEC: -0.029 arcsec/a	±0.002 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.003 arcsec/a	DEC: -0.025 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.9 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A2p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 1351
Durchmusterung	BD+04 2764
Boss General Catalogue	18335
Henry Draper Catalogue	118022

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

position:

position (equinox 1950.0)

RA: 13h 31min 35.8sec

DEC: +3° 54' 54''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	4.91
magnitute at min. brightness	4.99
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2434816.9 15. March 1954, 09:36:00 UT
period [d]	3.722
next maximum light [JD]	2451811.552 24. September 2000, 01:14:53 UT

spectral information

spectral class

A1p(Sr-Cr-Eu)

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 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	86/123
constellation	Virgo
notes on existence	The star is equivalent to '0860124 CX'.
There are notes in published catalog.

variability type description

variability type

description

ACV

Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.