delta Scuti

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

position, motion, parallax:

position (J2000)	RA: 18h 42min 16.4sec	DEC: -9° 3' 9''
position (2000.73)	RA: 18h 42min 18sec	DEC: -9° 3' 6''
position (B1900)	RA: 18h 36min 47.9sec	DEC: -9° 8' 54''
proper motion (J2000)	RA: 0.009 arcsec/a	DEC: 0.002 arcsec/a
radial velocity	-45 km/s note: spectroscopic binaries
rotational velocity	32 km/s (uncertain) (variable)
trigonometric parallax	0.025 arcsec
galactic coordinates	longitude: 23.83°	latitude: -2.1°

magnitude

visual magnitude

4.72
(V on UBV Johnson system)

spectral / color information

spectral class	F2IIIpDel Del
B-V-magnitude	0.35
U-B-magnitude	0.14
R-I-magnitude

variability information

variable star identification

Del Sct

note (category: variability):

ADS 11581A, Delta Sct 4.98 - 5.16B, 0.193770d, 0.11636d. Beat period 5.24774d. Other periods 0.095129, 0.186872, 0.838d. This "prototype" Delta Sct star is the least typical of its class.

double/multiple star system information

number of components of multiple star system	3
separation	52.6 arcsec
mag difference (of double or brightest multiple)	4.5
component ID	AC

note (category: double and multiple data):

Component B, 10v, gK, optical. AC, CPM? A may be close binary, about 10d orbital period.

miscellaneous information

note (category: group membership):

Hyades group.

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

position, motion, parallax:

position (J2000)	RA: 18h 42min 16.432sec	DEC: -9° 3' 9.2''	ą0.06 arcsec	source: 15
position (2000.73)	RA: 18h 42min 18sec	DEC: -9° 3' 6''	JD: 2451810.88
proper motion (J2000)	RA: 0.0006 arcsec/a	DEC: 0.002 arcsec/a		source: 25
radial velocity	-45 km/s			source: 25
trigonometric parallax	0.025 arcsec		ą0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 23.84°	latitude: -2.1°

magnitude:

visual	4.6 (observed)	source: 31
photovisual	4.7	source: 2
photographic	5	source: 2

spectral information:

spectral class	F0		source: 96
Morgan-Keenan	F2IIIpDeltaDel		source: 25
B-magnitude	5.07 ą0.05	B-V-magnitude	0.35
U-magnitude	5.21 ą0.05	U-B-magnitude	0.14

variability information:

source of data: 30

variability type	150
var. amplitude	0.19
var. period	0.19
var. epoch	2443379 23. August 1977, 12:00:00 UT
next max light	2451811.01 23. September 2000, 12:14:24 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	15.2 arcsec
magnitude difference between brightest and second brightest component	7.5
position angle	46 °

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
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: 18h 39min 32.109sec	DEC: -9° 6' 7.26''	ą0.005 arcsec
position (2000.73)	RA: 18h 42min 19sec	DEC: -9° 3' 6''	JD: 2451810.88
position (J2000)	RA: 18h 42min 16.434sec	DEC: -9° 3' 9.19''
proper motion B1950 (FK4)	RA: 0.0004 arcsec/a	DEC: 0.001 arcsec/a	ą0.001 arcsec/a in RA ą0.001 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	4.7 (accuracy: 2 decimals)
source of visual magnitude data	Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

spectral class	F0
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: 1486
Durchmusterung	BD-09 4796
Boss General Catalogue	25580
Henry Draper Catalogue	172748

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

position and proper motion:

position (J2000)	RA: 18h 42.3min	DEC: -9° 3'
proper motion (J2000)	RA: 0.009 arcsec/a	DEC: 0.002 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
AB	1938	3	46°	15.2''	4.7	12.2	F2IIIp	RST4594
AC	1879	8	130°	52.6''	4.7	9.2	-	H 36
AC	1982	8	-	52.2''	4.7	9.2	-	H 36
AD	1982	1	265°	110.1''	4.7	10.5	-	SLE 233

discoverer information:

discoverer code	discoverer	reference
RST4594	Rossiter, R.A.	-
H 36	Herschel, W.	-
SLE 233	Soulie, G.	-

notes:

note	Delta Scuti, prototype of the Delta Scuti variables. AC: H V 36.

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

position:

position (equinox 1950.0)

RA: 18h 39min 32.1sec

DEC: -9° 6' 7''

variability informations:

variability type	DSCT	pulsating variable star
magnitute at max. brightness	4.6
magnitute at min. brightness	4.79
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2443379.05 23. August 1977, 13:12:00 UT
period [d]	0.1937697
next maximum light [JD]	2451810.9384955 23. September 2000, 10:31:26 UT

spectral information

spectral class

F3IIIp

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	75/9004
constellation	Scutum
notes on existence	The star is equivalent to '0760001 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.

catalogues and names	d Sct, del Sct, HR 7020, HD 172748, SAO 142515, BD -9 4796, FK5: 1486, WDS 18423-0903A
constellation	Scutum