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	d3Tau, V0776 Tau, 68 Tau, HR 1389, HD 27962, SAO 93923, BD +17 719, WDS 04255+1756A
constellation	Taurus

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

position, motion, parallax:

position (J2000)	RA: 4h 25min 29.4sec	DEC: +17° 55' 41''
position (2000.72)	RA: 4h 25min 32sec	DEC: +17° 55' 47''
position (B1900)	RA: 4h 19min 42.1sec	DEC: +17° 41' 58''
proper motion (J2000)	RA: 0.108 arcsec/a	DEC: -0.028 arcsec/a
radial velocity	35 km/s note: spectroscopic binaries
rotational velocity	18 km/s (uncertain) (variable)
dynamical parallax	0.019 arcsec
galactic coordinates	longitude: 178.12°	latitude: -21.3°

magnitude

visual magnitude

4.29 (V on UBV Johnson system)

spectral / color information

spectral class	A2IV
B-V-magnitude	0.05
U-B-magnitude	0.08
R-I-magnitude

variability information

variable star identification

V776 Tau

note (category: variability):

Amp. 0.02U, 57.25d. Also magnetic field period.

double/multiple star system information

number of components of multiple star system	3
separation	1.5 arcsec
mag difference (of double or brightest multiple)	3.7
component ID	AB

note (category: double and multiple data):

AB binary; C, 11v at 77" CPM.

note (category: spectroscopic binaries):

57.25d, K 68.8k/s, V0 +23.0k/s, asini 50.6.

miscellaneous information

note (category: group membership):

Hyades cluster; Mel 25 #56.

note (category: stellar radii or diameters):

Diam. 2.1 solar.

note (category: miscellaneous):

A blue straggler.

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

position, motion, parallax:

position (J2000)	RA: 4h 25min 29.364sec	DEC: +17° 55' 40.37''	±0.35 arcsec	source: 17
position (2000.72)	RA: 4h 25min 32sec	DEC: +17° 55' 46''	JD: 2451809.25
proper motion (J2000)	RA: 0.0073 arcsec/a	DEC: -0.037 arcsec/a		source: 25
radial velocity	35 km/s			source: 25
galactic coord. (B1950)	longitude: 178.12°	latitude: -21.3°

magnitude:

visual	4.29 (observed)	source: 25
photovisual	4.2	source: 2
photographic	4.4	source: 16

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A2IV		source: 25
B-magnitude	4.34 ±0.05	B-V-magnitude	0.05
U-magnitude	4.42 ±0.05	U-B-magnitude	0.08

variability information:

source of data: 30

variability type	160
var. amplitude	0.03
var. period	57.25
var. epoch	2440501 6. October 1969, 12:00:00 UT
next max light	2451836.5 19. October 2000, 00:00:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	1.4 arcsec
magnitude difference between brightest and second brightest component	3.3
position angle	341 °

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
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: 4h 22min 35.58sec	DEC: +17° 48' 55.2''	±0.012 arcsec
position (2000.72)	RA: 4h 25min 32sec	DEC: +17° 55' 48''	JD: 2451809.25
position (J2000)	RA: 4h 25min 29.384sec	DEC: +17° 55' 41.26''
proper motion B1950 (FK4)	RA: 0.0076 arcsec/a	DEC: -0.027 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0076 arcsec/a	DEC: -0.028 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue	GC, catalogue number: 5354
Durchmusterung	BD+17 719
Boss General Catalogue	5354
Henry Draper Catalogue	27962

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

position and proper motion:

position (J2000)	RA: 4h 25.5min	DEC: +17° 56'
proper motion (J2000)	RA: 0.104 arcsec/a	DEC: -0.037 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
AB	1938	21	323°	1.3''	4.2	7.5	A2IV	KUI 17
	1988		341°	1.4''
AC	1783	11	235°	63.6''	4.2	8.7	-	H 101
	1925		233°	77.2''

discoverer information:

discoverer code	discoverer	reference
KUI 17	Kuiper, G.P.	-
H 101	Herschel, W.	-

notes:

note	Delta (3) Tau. A is a spectroscopic binary and variable, V776 Tau. H VI 101. There is a wide faint pair noticed by John Herschel, 320@ Class VI.

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

position:

position (equinox 1950.0)

RA: 4h 22min 35.6sec

DEC: +17° 48' 55''

variability informations:

variability type	ACV:	rotating variable star
magnitute at max. brightness	4.29
magnitute at min. brightness	4.32
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2440501.35 6. October 1969, 20:24:00 UT
period [d]	57.25
next maximum light [JD]	2451836.85 19. October 2000, 08:24:00 UT
rising time	50 % of period

spectral information

spectral class

A2/3IV/Vm

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	78/776
constellation	Taurus
notes on existence	The star is equivalent to '0780777 V0777'.
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.