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	g Equ, gam Equ, 5 Equ, HR 8097, HD 201601, SAO 126593, BD +9 4732, FK5: 1555, WDS 21103+1008A
constellation	Equuleus

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

position, motion, parallax:

position (J2000)	RA: 21h 10min 20.5sec	DEC: +10° 7' 54''
position (2000.72)	RA: 21h 10min 23sec	DEC: +10° 8' 5''
position (B1900)	RA: 21h 5min 28.7sec	DEC: +9° 43' 43''
proper motion (J2000)	RA: 0.057 arcsec/a	DEC: -0.153 arcsec/a
radial velocity	-17 km/s note: variable radial velocity
rotational velocity	8 km/s (uncertain) (variable)
trigonometric parallax	0.028 arcsec
galactic coordinates	longitude: 59.93°	latitude: -24.76°

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

1786d, possibly also short period? Rotation 17.492d?

note (category: dynamical parallaxes):

0.011".

magnitude

visual magnitude

4.69 (V on UBV Johnson system)

spectral / color information

spectral class	F0IIIp
B-V-magnitude	0.26
U-B-magnitude	0.1
R-I-magnitude

note (category: spectra):

Extreme oxygen deficiency. Eu, Cr, Sr strong, DyIII identified. The spectrum has been variously classified as cF1, F0III, and F0pV. Also classified A9Vp(SrCrEu st.,Ca wk.).

variability information

variable star identification

Gam Equ

note (category: variability):

ADS 14702A, Alpha CV 4.58 - 4.77V, 314d, 0 00868d. Magnetic field var. 1786d and 72y. Spectrum var. 72y.

double/multiple star system information

number of components of multiple star system	4
separation	352.5 arcsec
mag difference (of double or brightest multiple)	1.2
component ID	AD

note (category: double and multiple data):

AB binary, B, 11.6v at 2". C, 12.6v at 48" optical.

miscellaneous information

note (category: group membership):

Wolf 630 group.

note (category: stellar radii or diameters):

3 solar radii.

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

position, motion, parallax:

position (J2000)	RA: 21h 10min 20.518sec	DEC: +10° 7' 53.57''	±0.06 arcsec	source: 15
position (2000.72)	RA: 21h 10min 23sec	DEC: +10° 8' 5''	JD: 2451809.25
proper motion (J2000)	RA: 0.0038 arcsec/a	DEC: -0.153 arcsec/a		source: 25
radial velocity	-17 km/s			source: 25
trigonometric parallax	0.028 arcsec		±0.003 arcsec	source: 25
galactic coord. (B1950)	longitude: 59.94°	latitude: -24.76°

magnitude:

visual	4.6 (observed)	source: 31
photovisual	4.8	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	F0IIIp		source: 25
B-magnitude	4.95 ±0.05	B-V-magnitude	0.26
U-magnitude	5.05 ±0.05	U-B-magnitude	0.1

variability information:

source of data: 30

variability type	161
var. amplitude	0.19
var. period	0.01

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	3.5
position angle	264 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	4.6	F0	g Equulei, 5 Equ, HR 8097, HD 201601, SAO 126593
B	6.07	A2	6 Equ, HR 8098, HD 201616, SAO 126597

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
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: 21h 7min 54.579sec	DEC: +9° 55' 44.82''	±0.005 arcsec
position (2000.72)	RA: 21h 10min 23sec	DEC: +10° 8' 12''	JD: 2451809.25
position (J2000)	RA: 21h 10min 20.546sec	DEC: +10° 7' 53.33''
proper motion B1950 (FK4)	RA: 0.004 arcsec/a	DEC: -0.152 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0042 arcsec/a	DEC: -0.156 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 the "Henry Draper Catalogue".

spectral information:

spectral class	F0p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 1555
Durchmusterung	BD+09 4732
Boss General Catalogue	29591
Henry Draper Catalogue	201601

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

position and proper motion:

position (J2000)	RA: 21h 10.3min	DEC: +10° 8'
proper motion (J2000)	RA: 0.057 arcsec/a	DEC: -0.153 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	1867	23	276°	2.1''	4.7	8.2	A9V	KNT 5
	1994		264°	1.4''
AC	1877	10	10°	41.3''	4.8	12.6	-	BU 71
	1925		5°	47.7''
AD	1835	7	153°	366.2''	4.8	6	-	STF 54
	1922		-	352.5''

discoverer information:

discoverer code	discoverer	reference
KNT 5	Knott, G.	-
BU 71	Burnham, S.W.	-
STF 54	Struve, F.G.W.	-

notes:

note	Gamma Equ. A is an Alpha CVn-type variable. There apparently is a long-period spectroscopic binary present.

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

position:

position (equinox 1950.0)

RA: 21h 7min 54.6sec

DEC: +9° 55' 45''

variability informations:

variability type	ACVO	rotating variable star
magnitute at max. brightness	4.58
magnitute at min. brightness	4.77
photometric system	visual, photovisual or Johnson's V
period [d]	0.00868

spectral information

spectral class

F0p(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	35/9003
constellation	Equuleus
notes on existence	The star is equivalent to '0360001 R'.
There are notes in published catalog.

variability type description

variability type

description

ACVO

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.