catalogues and names

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names

EW Sct, HD 171955, SAO 142447, BD -6 4816

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

position, motion, parallax:

position (J2000)	RA: 18h 37min 51.138sec	DEC: -6° 47' 48.72''	±0.2 arcsec	source: 15
position (2000.72)	RA: 18h 37min 53sec	DEC: -6° 47' 47''	JD: 2451806.31
proper motion (J2000)	RA: 0.0009 arcsec/a	DEC: 0.001 arcsec/a		source: 15
trigonometric parallax	0.019 arcsec		±0.002 arcsec	source: 15
galactic coord. (B1950)	longitude: 25.34°	latitude: -0.09°

magnitude:

visual	7.77 (observed)	source: 30
photovisual	8	source: 16
photographic	9.3	source: 2

spectral information:

spectral class	K0		source: 96
B-magnitude	9.73 ±0.035	B-V-magnitude	1.76
U-magnitude	11.13 ±0.02	U-B-magnitude	1.4

variability information:

source of data: 30

variability type	114
var. amplitude	0.47

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
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
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: 18h 35min 9.418sec	DEC: -6° 50' 27.71''	±0.022 arcsec
position (2000.72)	RA: 18h 37min 53sec	DEC: -6° 47' 47''	JD: 2451806.31
position (J2000)	RA: 18h 37min 51.124sec	DEC: -6° 47' 48.64''
proper motion B1950 (FK4)	RA: 0.0004 arcsec/a	DEC: 0.001 arcsec/a	±0.009 arcsec/a in RA ±0.009 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0006 arcsec/a	DEC: 0.002 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	8.2 (accuracy: 1 decimal)
source of visual magnitude data	Taken from AGK1.

spectral information:

spectral class	K0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	Yale Transactions 16, catalogue number: 6243
Durchmusterung	BD-06 4816
Henry Draper Catalogue	171955

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

position:

position (equinox 1950.0)

RA: 18h 35min 9.4sec

DEC: -6° 50' 28''

variability informations:

variability type	CEP(B)	pulsating variable star
magnitute at max. brightness	7.77
magnitute at min. brightness	8.24
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

G5

references

to a study	Vol. III GCVS
to a chart/photograph	no chart is avaible, but the star is contained in the 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	75/166
constellation	Scutum
notes on existence	The star is equivalent to '0750167 EX'.
There are notes in published catalog.

variability type description

variability type

description

CEP(B)

Cepheids. Radially pulsating, high luminosity (classes Ib-II) variables with periods in the range of 1-135 days and amplitudes from several hundredths to 2 mag in V (in the B band, the amplitudes are greater). Spectral type at maximum light is F; at minimum, the types are G-K. The longer the period of light variation,the later is the spectral type. The maximum of the surface-layer expansion velocity almost coinciding with maximum light. CEP(B) Cepheids (TU Cas, V 367 Sct) displaying the presence of two or more simultaneously operating pulsation modes (usually the fundamental tone with the period P0 and the first overtone P1). The periods P0 are in the range from 2 to 7 days, with the ratio P1/P0 approx. 0.71.