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	V1741 Cyg, 4 Cyg, HR 7395, HD 183056, SAO 68301, BD +36 3557, FK5: 3554
constellation	Cygnus

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

position, motion, parallax:

position (J2000)	RA: 19h 26min 9.1sec	DEC: +36° 19' 4''
position (2000.72)	RA: 19h 26min 11sec	DEC: +36° 19' 9''
position (B1900)	RA: 19h 22min 33sec	DEC: +36° 7' 2''
proper motion (J2000)	RA: 0.005 arcsec/a	DEC: 0.014 arcsec/a
radial velocity	-22 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	34 km/s (uncertain) (variable)
trigonometric parallax	-0.007 arcsec
galactic coordinates	longitude: 69.11°	latitude: 9.31°

magnitude

visual magnitude

5.15 (V on UBV Johnson system)

spectral / color information

spectral class	B9pSi
B-V-magnitude	-0.12
U-B-magnitude	-0.43

note (category: spectra):

Magnetic star.

variability information

variable star identification

V1741 Cyg

note (category: variability):

Alpha CV, amp. 0.02U, 0.68674d.

double/multiple star system information

note (category: spectroscopic binaries):

35.0225d, K 5.7k/s, V0 -11.0k/s, asini 2.45.

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

position, motion, parallax:

position (J2000)	RA: 19h 26min 9.155sec	DEC: +36° 19' 4.46''	±0.43 arcsec	source: 16
position (2000.72)	RA: 19h 26min 11sec	DEC: +36° 19' 9''	JD: 2451809.25
proper motion (J2000)	RA: 0.0006 arcsec/a	DEC: 0.014 arcsec/a		source: 25
radial velocity	-22 km/s			source: 25
galactic coord. (B1950)	longitude: 69.12°	latitude: 9.31°

magnitude:

visual	5.15 (observed)	source: 25
photovisual	5.2	source: 2
photographic	5.1	source: 16

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	B9pSi		source: 25
B-magnitude	5.03 ±0.05	B-V-magnitude	-0.12
U-magnitude	4.6 ±0.05	U-B-magnitude	-0.43

variability information:

source of data: 30

variability type	160
var. amplitude	0.02
var. period	0.69
var. epoch	2441451 13. May 1972, 12:00:00 UT
next max light	2451809.28 21. September 2000, 18:43:12 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
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
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: 19h 24min 20.985sec	DEC: +36° 12' 59.35''	±0.013 arcsec
position (2000.72)	RA: 19h 26min 11sec	DEC: +36° 19' 9''	JD: 2451809.25
position (J2000)	RA: 19h 26min 9.125sec	DEC: +36° 19' 4.12''
proper motion B1950 (FK4)	RA: 0.0001 arcsec/a	DEC: 0.011 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0004 arcsec/a	DEC: 0.01 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A0p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 26846
Durchmusterung	BD+36 3557
Boss General Catalogue	26846
Henry Draper Catalogue	183056

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

position:

position (equinox 1950.0)

RA: 19h 24min 21sec

DEC: +36° 12' 59''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	4.6
magnitute amplitude	0.02
photometric system
epoch for maximum light [JD]	2441451.03 13. May 1972, 12:43:12 UT
period [d]	0.68674
next maximum light [JD]	2451809.81616 22. September 2000, 07:35:16 UT

spectral information

spectral class

B9p(Si)

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	31/1741
constellation	Cygnus
notes on existence	The star is equivalent to '0311742 V1742'.

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.