catalogues and names

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

FK Aqr, HD 214479, SAO 191294, BD -21 6267, WDS 22388-2037

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

position, motion, parallax:

position (J2000)	RA: 22h 38min 45.606sec	DEC: -20° 37' 16.41''	±0.21 arcsec	source: 16
position (2000.73)	RA: 22h 38min 48sec	DEC: -20° 37' 2''	JD: 2451812.24
proper motion (J2000)	RA: 0.0322 arcsec/a	DEC: -0.084 arcsec/a		source: 16
galactic coord. (B1950)	longitude: 37.83°	latitude: -59.07°

magnitude:

visual	9.07 (observed)	source: 30
photovisual	8.8	source: 16

spectral information:

spectral class	M0		source: 96
Morgan-Keenan	M0Vep		source: 23
B-magnitude	10.6 ±0.007	B-V-magnitude	1.5
U-magnitude	11.69 ±0.014	U-B-magnitude	1.09

variability information:

source of data: 30

variability type	10
var. amplitude	0.06
var. period	4.08

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	24.5 arcsec
magnitude difference between brightest and second brightest component	2.35
position angle	351 °

sources:

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
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
23	Michigan Catalog of 2-Dimensional Spectral Types, Volume IV
Houk, N. and Smith-Moore, D., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 4, (Zones -25 to -12 Degrees), Ann Arbor: The University of Michigan, 1988
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: 22h 36min 1.287sec	DEC: -20° 52' 49.35''	±0.033 arcsec
position (2000.73)	RA: 22h 38min 46sec	DEC: -20° 36' 58''	JD: 2451812.24
position (J2000)	RA: 22h 38min 45.615sec	DEC: -20° 37' 14.36''
proper motion B1950 (FK4)	RA: 0.0325 arcsec/a	DEC: -0.056 arcsec/a	±0.02 arcsec/a in RA ±0.015 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0325 arcsec/a	DEC: -0.059 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	9.1 (accuracy: 1 decimal)
source of visual magnitude data	Taken from AGK1.

spectral information:

spectral class	M1
source of spectral data	Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue	Yale Transactions 13 Part I, catalogue number: 9571
Durchmusterung	BD-21 6267
Henry Draper Catalogue	214479

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

position and proper motion:

position (J2000)	RA: 22h 38.8min	DEC: -20° 37'
proper motion (J2000)	RA: 0.449 arcsec/a	DEC: -0.081 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
-	1877	6	359°	21.4''	9.09	11.44	M0Vep	HJ 3126
	1992		351°	24.5''

discoverer information:

discoverer code	discoverer	reference
HJ 3126	Herschel, J.	-

notes:

note	A is a BY Dra-type variable, and B is a flare star.

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

position:

position (equinox 1950.0)

RA: 22h 36min 1.3sec

DEC: -20° 52' 49''

variability informations:

variability type	UV+BY	eruptive variable star rotating variable star
magnitute at max. brightness	9.07
magnitute at min. brightness	9.13
photometric system	visual, photovisual or Johnson's V
period [d]	4.08

spectral information

spectral class

M1Ve+M1:Ve

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	4/174
constellation	Aquarius
notes on existence	The star is equivalent to '0040175 FL'.
There are notes in published catalog.

variability type description

variability type	description
UV	Eruptive variables of the UV Ceti type, these are K Ve-M Ve stars sometimes displaying flare activity with amplitudes from several tenths of a magnitude up to 6 mag in V. The amplitude is considerably greater in the ultraviolet spectral region. Maximum light is attained in several seconds or dozens of seconds after the beginning of a flare; the star returns to its normal brightness in several minutes or dozens of minutes.
BY	BY Draconis-type variables, which are emission-line dwarfs of dKe-dMe spectral type showing quasiperiodic light changes with periods from a fraction of a day to 120 days and amplitudes from several hundredths to 0.5 mag in V. The light variability is caused by axial rotation of a star with a variable degree of nonuniformity of the surface brightness (spots) and chromospheric activity. Some of these stars also show flares similar to those of UV Cet stars, and in those cases they also belong to the latter type and are simultaneously considered eruptive variables.