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	e Per, eps Per, 45 Per, HR 1220, HD 24760, SAO 56840, BD +39 895, FK5: 147, WDS 03578+4000A
constellation	Perseus

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

position, motion, parallax:

position (J2000)	RA: 3h 57min 51.2sec	DEC: +40° 0' 37''
position (2000.72)	RA: 3h 57min 54sec	DEC: +40° 0' 44''
position (B1900)	RA: 3h 51min 8.4sec	DEC: +39° 43' 16''
proper motion (J2000)	RA: 0.018 arcsec/a	DEC: -0.026 arcsec/a
radial velocity	1 km/s note: spectroscopic binaries, double lined spectra
rotational velocity	153 km/s (uncertain) (variable)
trigonometric parallax	0.009 arcsec
galactic coordinates	longitude: 157.35°	latitude: -10.09°

magnitude

visual magnitude

2.89 (V on UBV Johnson system)

spectral / color information

spectral class	B0.5V+A2V
B-V-magnitude	-0.18
U-B-magnitude	-0.99
R-I-magnitude

note (category: colors):

Color excess E(B-V) = +0.10.

variability information

variable star identification

Eps Per

note (category: variability):

Beta C, 2.88 - 3.00V, 0.216:d. Brightest component on visual triple. Photoelectric and spectroscopic resonant periods found are submultiples of 26.9 hrs or 1.12d.

double/multiple star system information

number of components of multiple star system	3
separation	8.8 arcsec
mag difference (of double or brightest multiple)	5.1
component ID	AB

note (category: double and multiple data):

AB CPM. B, 7.39V, -0.03(B-V), -0.52(U-B), B9.5V, vsini 300:k/s.

miscellaneous information

note (category: group membership):

Cas-Tau OB1; member of Pleiades group.

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

position, motion, parallax:

position (J2000)	RA: 3h 57min 51.227sec	DEC: +40° 0' 36.72''	±0.06 arcsec	source: 15
position (2000.72)	RA: 3h 57min 54sec	DEC: +40° 0' 44''	JD: 2451809.20
proper motion (J2000)	RA: 0.0016 arcsec/a	DEC: -0.026 arcsec/a		source: 25
radial velocity	1 km/s			source: 25
trigonometric parallax	0.009 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 157.36°	latitude: -10.09°

magnitude:

visual	2.89 (observed)	source: 25
photovisual	3	source: 2

spectral information:

spectral class	B1		source: 96
Morgan-Keenan	B0.5V+A2V		source: 25
B-magnitude	2.69 ±0.05	B-V-magnitude	-0.2
U-magnitude	1.74 ±0.05	U-B-magnitude	-0.95

variability information:

source of data: 27

variability type	140
var. amplitude	0.1

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	8.8 arcsec
magnitude difference between brightest and second brightest component	4.5
position angle	10 °

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
27	Catalog of Red Magnitudes (CRM)
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: 3h 54min 29.432sec	DEC: +39° 52' 2.54''	±0.004 arcsec
position (2000.72)	RA: 3h 57min 54sec	DEC: +40° 0' 46''	JD: 2451809.20
position (J2000)	RA: 3h 57min 51.22sec	DEC: +40° 0' 36.66''
proper motion B1950 (FK4)	RA: 0.0015 arcsec/a	DEC: -0.024 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0015 arcsec/a	DEC: -0.026 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	B1
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 147
Durchmusterung	BD+39 895
Boss General Catalogue	4759
Henry Draper Catalogue	24760

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

position:

position (equinox 1950.0)

RA: 3h 54min 29.4sec

DEC: +39° 52' 3''

variability informations:

variability type	BCEP	pulsating variable star
magnitute at max. brightness	2.88
magnitute at min. brightness	3
photometric system	visual, photovisual or Johnson's V

references

to a study	J.R.Percy, M.Bietenholz, A.Fullerton, IBVS No.2588,1984.
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	63/9005
constellation	Perseus
notes on existence	The star is equivalent to '68098'.

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.