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	o Ser, omi Ser, 56 Ser, HR 6581, HD 160613, SAO 160747, BD -12 4808, FK5: 3405
constellation	Serpens

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

position, motion, parallax:

position (J2000)	RA: 17h 41min 24.9sec	DEC: -12° 52' 31''
position (2000.73)	RA: 17h 41min 27sec	DEC: -12° 52' 32''
position (B1900)	RA: 17h 35min 47.6sec	DEC: -12° 49' 19''
proper motion (J2000)	RA: -0.069 arcsec/a	DEC: -0.052 arcsec/a
radial velocity	-30 km/s note: spectroscopic binaries, double lined spectra
rotational velocity	125 km/s (uncertain) (variable)
trigonometric parallax	0.006 arcsec
galactic coordinates	longitude: 13.28°	latitude: 9.17°

magnitude

visual magnitude

4.26 (V on UBV Johnson system)

spectral / color information

spectral class	A2V
B-V-magnitude	0.08
U-B-magnitude	0.1
R-I-magnitude

variability information

variable star identification

Omi Ser

note (category: variability):

Delta Sct 4.20 - 4.26V, 0.053d.

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

position, motion, parallax:

position (J2000)	RA: 17h 41min 24.884sec	DEC: -12° 52' 30.83''	±0.19 arcsec	source: 16
position (2000.73)	RA: 17h 41min 27sec	DEC: -12° 52' 32''	JD: 2451810.88
proper motion (J2000)	RA: -0.0046 arcsec/a	DEC: -0.048 arcsec/a		source: 25
radial velocity	-30 km/s			source: 25
trigonometric parallax	0.006 arcsec		±0.001 arcsec	source: 25
galactic coord. (B1950)	longitude: 13.28°	latitude: 9.17°

magnitude:

visual	4.26 (observed)	source: 25
photovisual	4.4	source: 2
photographic	4.5	source: 2

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A2V		source: 25
B-magnitude	4.34 ±0.05	B-V-magnitude	0.08
U-magnitude	4.44 ±0.05	U-B-magnitude	0.1

variability information:

source of data: 30

variability type	10
var. amplitude	0.01
var. period	0.05

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
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
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
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: 17h 38min 36.141sec	DEC: -12° 51' 1.01''	±0.01 arcsec
position (2000.73)	RA: 17h 41min 27sec	DEC: -12° 52' 29''	JD: 2451810.88
position (J2000)	RA: 17h 41min 24.888sec	DEC: -12° 52' 30.94''
proper motion B1950 (FK4)	RA: -0.005 arcsec/a	DEC: -0.055 arcsec/a	±0.002 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0048 arcsec/a	DEC: -0.053 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 23978
Durchmusterung	BD-12 4808
Boss General Catalogue	23978
Henry Draper Catalogue	160613

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

position:

position (equinox 1950.0)

RA: 17h 38min 36.1sec

DEC: -12° 51' 1''

variability informations:

variability type	DSCTC:	pulsating variable star
magnitute at max. brightness	4.26
magnitute amplitude	0.01
photometric system	visual, photovisual or Johnson's V
period [d]	0.053

spectral information

spectral class

A2V

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	76/9015
constellation	Serpens
notes on existence	The star is equivalent to '07690194tau 4'.
There are notes in published catalog.

variability type description

variability type

description

DSCTC

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.