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	d Del, del Del, 11 Del, HR 7928, HD 197461, SAO 106425, BD +14 4403, FK5: 778
constellation	Delphinus

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

position, motion, parallax:

position (J2000)	RA: 20h 43min 27.5sec	DEC: +15° 4' 28''
position (2000.73)	RA: 20h 43min 30sec	DEC: +15° 4' 38''
position (B1900)	RA: 20h 38min 47.4sec	DEC: +14° 42' 57''
proper motion (J2000)	RA: -0.019 arcsec/a	DEC: -0.043 arcsec/a
radial velocity	9 km/s note: spectroscopic binaries
rotational velocity	41 km/s (uncertain) (variable)
trigonometric parallax	0.013 arcsec
galactic coordinates	longitude: 60.14°	latitude: -16.55°

magnitude

visual magnitude

4.43 (V on UBV Johnson system)

spectral / color information

spectral class	A7IIIpDel Del
B-V-magnitude	0.32
U-B-magnitude	0.1
R-I-magnitude

note (category: spectra):

Underabundant metals. Also classified F0IVp.

variability information

variable star identification

Del Del

note (category: variability):

Delta Sct 4.39 - 4.49V, 0.135547 and 0.154991d. Combined magnitude of two components.

double/multiple star system information

note (category: spectroscopic binaries):

40.58d. Both components Delta Sct type variables.

miscellaneous information

note (category: group membership):

Sirius group?

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

position, motion, parallax:

position (J2000)	RA: 20h 43min 27.538sec	DEC: +15° 4' 28.42''	±0.06 arcsec	source: 15
position (2000.73)	RA: 20h 43min 30sec	DEC: +15° 4' 38''	JD: 2451810.88
proper motion (J2000)	RA: -0.0013 arcsec/a	DEC: -0.043 arcsec/a		source: 25
radial velocity	9 km/s			source: 25
trigonometric parallax	0.013 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 60.14°	latitude: -16.55°

magnitude:

visual	4.4 (observed)	source: 31
photovisual	4.5	source: 2

spectral information:

spectral class	A5		source: 96
Morgan-Keenan	A7IIIpDeltaDel		source: 25
B-magnitude	4.75 ±0.05	B-V-magnitude	0.32
U-magnitude	4.85 ±0.05	U-B-magnitude	0.1

variability information:

source of data: 30

variability type	150
var. amplitude	0.11

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: 20h 41min 7.413sec	DEC: +14° 53' 38.69''	±0.004 arcsec
position (2000.73)	RA: 20h 43min 29sec	DEC: +15° 4' 40''	JD: 2451810.88
position (J2000)	RA: 20h 43min 27.542sec	DEC: +15° 4' 28.36''
proper motion B1950 (FK4)	RA: -0.0014 arcsec/a	DEC: -0.041 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0013 arcsec/a	DEC: -0.044 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.5 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	A5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 778
Durchmusterung	BD+14 4403
Boss General Catalogue	28873
Henry Draper Catalogue	197461

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

position:

position (equinox 1950.0)

RA: 20h 41min 7.4sec

DEC: +14° 53' 39''

variability informations:

variability type	DSCT	pulsating variable star
magnitute at max. brightness	4.38
magnitute at min. brightness	4.49
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

F0IV

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	32/9004
constellation	Delphinus
notes on existence	The star is equivalent to '0330001 R'.
There are notes in published catalog.

variability type description

variability type

description

DSCT

Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables. DSCTC Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.