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	V0695 Cyg, 31 Cyg, HR 7735, HD 192577, SAO 49337, BD +46 2882, FK5: 757, WDS 20136+4644A
constellation	Cygnus

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

note (category: star names):

See HR 7730.

position, motion, parallax:

position (J2000)	RA: 20h 13min 37.9sec	DEC: +46° 44' 29''
position (2000.73)	RA: 20h 13min 39sec	DEC: +46° 44' 37''
position (B1900)	RA: 20h 10min 28.9sec	DEC: +46° 26' 16''
proper motion (J2000)	RA: 0.004 arcsec/a	DEC: 0.003 arcsec/a
radial velocity	-8 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	=<25 km/s (uncertain) (variable)
trigonometric parallax	0.007 arcsec
galactic coordinates	longitude: 82.68°	latitude: 6.78°

magnitude

visual magnitude

3.79 (V on UBV Johnson system)

spectral / color information

spectral class	K2II+B3V
B-V-magnitude	1.28
U-B-magnitude	0.42
R-I-magnitude
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

note (category: spectra):

Also classified K4Iab + B4IV-V.

variability information

variable star identification

V695 Cyg

note (category: variability):

ADS 13554A, EA 3.77 - 3.88V, 3784.3d. Amp. varies strongly with wavelength. C = NSV 12931, 6.98V.

double/multiple star system information

number of components of multiple star system	6
separation	337.5 arcsec
mag difference (of double or brightest multiple)	1
component ID	AD

note (category: double and multiple data):

Component C, 6.99V, -0.14(B-V), -0.58(U-B) B5V, vsini : 25k/s, at 107" fixed. AP probably single star.

note (category: spectroscopic binaries):

ADS 13554A, 3784.3d, K 14.0k/s, V0 -7.7k/s, msin3i 9.19, asini 711. Unresolved by speckle interferometry. SKYLAB indicates cool star with hot companion. vsini of secondary 80k/s.

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

position, motion, parallax:

position (J2000)	RA: 20h 13min 37.904sec	DEC: +46° 44' 28.87''	±0.06 arcsec	source: 15
position (2000.73)	RA: 20h 13min 39sec	DEC: +46° 44' 37''	JD: 2451810.11
proper motion (J2000)	RA: 0.0004 arcsec/a	DEC: 0.003 arcsec/a		source: 25
radial velocity	-8 km/s			source: 25
trigonometric parallax	0.007 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 82.68°	latitude: 6.78°

magnitude:

visual	3.79 (observed)	source: 25
photovisual	4	source: 2

spectral information:

spectral class	K0		source: 96
Morgan-Keenan	K2II+B3V		source: 25
B-magnitude	5.07 ±0.05	B-V-magnitude	1.28
U-magnitude	5.49 ±0.05	U-B-magnitude	0.42

variability information:

source of data: 27

variability type	310
var. amplitude	0.2
var. period	3784.3
var. epoch	2441470 1. June 1972, 12:00:00 UT
next max light	2452822.9 2. July 2003, 09:36:00 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	0 arcsec
position angle	111 °

component	magnitude	spectral class	catalogue(s)/name(s)
A	3.79	K0	31 Cyg, HR 7735, HD 192577, SAO 49337
B	4.83	A2	30 Cyg, HR 7730, HD 192514, SAO 49332
C	6.99	B9

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: 20h 12min 3.343sec	DEC: +46° 35' 19.88''	±0.004 arcsec
position (2000.73)	RA: 20h 13min 39sec	DEC: +46° 44' 37''	JD: 2451810.11
position (J2000)	RA: 20h 13min 37.9sec	DEC: +46° 44' 28.89''
proper motion B1950 (FK4)	RA: 0 arcsec/a	DEC: 0.005 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0004 arcsec/a	DEC: 0.003 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4 (accuracy: 2 decimals)
source of visual magnitude data	Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

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

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	FK4, catalogue number: 757
Durchmusterung	BD+46 2882
Boss General Catalogue	28099
Henry Draper Catalogue	192577

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

position and proper motion:

position (J2000)	RA: 20h 13.6min	DEC: +46° 44'
proper motion (J2000)	RA: 0.004 arcsec/a	DEC: 0.003 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
Aa	1949	5	140°	0.1''	3.78	-	K2II+B3V	WRH
	1985		111°	0''
Aa-B	1878	2	331°	36.6''	3.78	13.3	-	HJ 1495
Aa-C	1836	12	173°	107''	3.78	6.99	-	STF 50
Aa-D	1835	9	323°	337.5''	3.78	5	-	STF 50
Aa-F	1878	1	170°	43.2''	3.78	-	-	BU 1483
CG	1878	1	92°	40.1''	-	-	-	BU 1483
CH	1878	1	62°	60.5''	-	-	-	BU 1483
CI	1878	1	136°	60.5''	-	-	-	BU 1483
DC	1901	1	150°	433.6''	4.83	6.9	A5IIIn	GUI
DE	1900	2	252°	32.9''	4.83	13.2	-	ES 26
	1912		251°	34.3''

discoverer information:

discoverer code	discoverer	reference
WRH	Wilson, R.H.
HJ 1495	Herschel, J.	-
STF 50	Struve, F.G.W.	-
BU 1483	Burnham, S.W.	-
GUI	Guillaume, J.
ES 26	Espin, T.E.	(Mon. Not. R. Astron. Soc. 88, 185; 1928.)

notes:

note	31 Cyg. STF 50, App I. Aa seen single in 1953, resolved once again by McAlister in 1980. A is the Algol-type eclipsing system V695 Cyg; spectrum K2II+B3V. DC: 30 Cyg.

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

position:

position (equinox 1950.0)

RA: 20h 12min 3.3sec

DEC: +46° 35' 20''

variability informations:

variability type	EA/GS/D	close binary eclipsing system
magnitute at max. brightness	3.73
magnitute at min. brightness	3.89
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2441470 1. June 1972, 12:00:00 UT
period [d]	3784.3
next maximum light [JD]	2452822.9 2. July 2003, 09:36:00 UT
duration of the eclipse	02 % of period

spectral information

spectral class

K4Iab+B4IV-V

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	31/695
constellation	Cygnus
notes on existence	The star is equivalent to '0310696 V0696'.
There are notes in published catalog.

variability type description

variability type	description
EA	Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other. Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion. EA Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes. EB Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V. EW W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.
GS	Systems with one or both giant and supergiant components; one of the components may be a main sequence star.
D	Detached systems, with components not filling their inner Roche lobes.