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	Nusakan, b CrB, bet CrB, 3 CrB, HR 5747, HD 137909, SAO 83831, BD +29 2670, FK5: 572, WDS 15278+2906
constellation	Corona Borealis

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

note (category: star names):

Nusakan.

position, motion, parallax:

position (J2000)	RA: 15h 27min 49.7sec	DEC: +29° 6' 21''
position (2000.72)	RA: 15h 27min 52sec	DEC: +29° 6' 12''
position (B1900)	RA: 15h 23min 42.3sec	DEC: +29° 27' 1''
proper motion (J2000)	RA: -0.179 arcsec/a	DEC: 0.086 arcsec/a
radial velocity	-19 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	19 km/s (uncertain) (variable)
trigonometric parallax	0.032 arcsec
galactic coordinates	longitude: 45.59°	latitude: 55.61°

magnitude

visual magnitude

3.68 (V on UBV Johnson system)

spectral / color information

spectral class	F0p
B-V-magnitude	0.28
U-B-magnitude	0.11
R-I-magnitude

note (category: spectra):

Also classified A8IIIpSrCrEu. Extreme oxygen deficiency relative to magnesium. Magnetic field an indicator of stellar rotation. Uranium 3860 but not thorium in spectrum.

variability information

variable star identification

Bet CrB

note (category: variability):

Alpha CV 3.65 - 3.72V, 18.487d. Magnetic field and rotation same period. Variable H alpha. Amp., light, magnetic field, spectrum vary per. 10.5y. Possible secondary light period of 240d.

double/multiple star system information

separation	0.3 arcsec
mag difference (of double or brightest multiple)	1.5
note	Worley (1978) update of the IDS

note (category: double and multiple data):

First astrometric binary discovered from parallax measurements, by K. Burns, 1931.

note (category: spectroscopic binaries):

10.496y, K 9.2k/s, V0 -18.0k/s, asini 442. The two SB components first resolved visually 1975. Possible secondary RV period 320.17d. Resolved by speckle interferometry 1986.45, sep. 0.31".

miscellaneous information

note (category: group membership):

Hyades group.

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

position, motion, parallax:

position (J2000)	RA: 15h 27min 49.739sec	DEC: +29° 6' 20.59''	±0.06 arcsec	source: 15
position (2000.72)	RA: 15h 27min 52sec	DEC: +29° 6' 12''	JD: 2451809.24
proper motion (J2000)	RA: -0.0137 arcsec/a	DEC: 0.086 arcsec/a		source: 25
radial velocity	-19 km/s			source: 25
trigonometric parallax	0.032 arcsec		±0.003 arcsec	source: 25
galactic coord. (B1950)	longitude: 45.58°	latitude: 55.61°

magnitude:

visual	3.6 (observed)	source: 31
photovisual	3.7	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	F0p		source: 25
B-magnitude	3.96 ±0.05	B-V-magnitude	0.28
U-magnitude	4.07 ±0.05	U-B-magnitude	0.11

variability information:

source of data: 30

variability type	160
var. amplitude	0.07
var. period	18.49
var. epoch	2440335 23. April 1969, 12:00:00 UT
next max light	2451817.29 29. September 2000, 18:57:36 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: 15h 25min 45.944sec	DEC: +29° 16' 37.26''	±0.004 arcsec
position (2000.72)	RA: 15h 27min 52sec	DEC: +29° 6' 7''	JD: 2451809.24
position (J2000)	RA: 15h 27min 49.751sec	DEC: +29° 6' 20.49''
proper motion B1950 (FK4)	RA: -0.0137 arcsec/a	DEC: 0.083 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0135 arcsec/a	DEC: 0.085 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	3.7 (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: 572
Durchmusterung	BD+29 2670
Boss General Catalogue	20795
Henry Draper Catalogue	137909

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

position and proper motion:

position (J2000)	RA: 15h 27.8min	DEC: +29° 6'
proper motion (J2000)	RA: -0.179 arcsec/a	DEC: 0.086 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
-	1945	48	°	''	3.68	-	F0p	JEF 1

discoverer information:

discoverer code	discoverer	reference
JEF 1	Jeffers, H.M.	-

notes:

note	Beta CrB. A spectroscopic binary resolved visually, and a variable of Alpha CVn-type. P = 10.3yr., a = 0.205", motion retrograde.

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

position:

position (equinox 1950.0)

RA: 15h 25min 45.9sec

DEC: +29° 16' 37''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	3.65
magnitute at min. brightness	3.72
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2440335 23. April 1969, 12:00:00 UT
period [d]	18.487
next maximum light [JD]	2451815.427 27. September 2000, 22:14:53 UT

spectral information

spectral class

F0IIIp(Sr-Cr-Eu)

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	27/9002
constellation	Corona Borealis
notes on existence	The star is equivalent to '0279003 gam'.
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.