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	Beid, o1Eri, omi 1 Eri, 38 Eri, HR 1298, HD 26574, SAO 131019, BD -7 764, FK5: 154
constellation	Eridanus

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

note (category: star names):

Beid.

position, motion, parallax:

position (J2000)	RA: 4h 11min 51.9sec	DEC: -6° 50' 15''
position (2000.73)	RA: 4h 11min 54sec	DEC: -6° 50' 8''
position (B1900)	RA: 4h 6min 59sec	DEC: -7° 5' 54''
proper motion (J2000)	RA: 0.01 arcsec/a	DEC: 0.082 arcsec/a
radial velocity	11 km/s note: variable radial velocity
rotational velocity	96 km/s (uncertain) (variable)
trigonometric parallax	0.033 arcsec
galactic coordinates	longitude: 199.32°	latitude: -38.39°

magnitude

visual magnitude

4.04 (V on UBV Johnson system)

spectral / color information

spectral class	F2II-III
B-V-magnitude	0.33
U-B-magnitude	0.13
R-I-magnitude

variability information

variable star identification

Omi1 Eri

note (category: variability):

Delta Sct 4.00 - 4.05V, 0.0815d. Secondary per. 0.1291d.

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

position, motion, parallax:

position (J2000)	RA: 4h 11min 51.936sec	DEC: -6° 50' 15.3''	±0.06 arcsec	source: 15
position (2000.73)	RA: 4h 11min 54sec	DEC: -6° 50' 8''	JD: 2451810.88
proper motion (J2000)	RA: 0.0007 arcsec/a	DEC: 0.082 arcsec/a		source: 25
radial velocity	11 km/s			source: 25
trigonometric parallax	0.033 arcsec		±0.003 arcsec	source: 25
galactic coord. (B1950)	longitude: 199.33°	latitude: -38.39°

magnitude:

visual	4.04 (observed)	source: 25
photovisual	4.1	source: 2
photographic	4.5	source: 2

spectral information:

spectral class	F2		source: 96
Morgan-Keenan	F2II-III		source: 25
B-magnitude	4.37 ±0.05	B-V-magnitude	0.33
U-magnitude	4.5 ±0.05	U-B-magnitude	0.13

variability information:

source of data: 30

variability type	10
var. amplitude	0.05
var. period	0.08

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
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: 4h 9min 25.339sec	DEC: -6° 57' 59.74''	±0.004 arcsec
position (2000.73)	RA: 4h 11min 54sec	DEC: -6° 50' 13''	JD: 2451810.88
position (J2000)	RA: 4h 11min 51.936sec	DEC: -6° 50' 15.29''
proper motion B1950 (FK4)	RA: 0.0003 arcsec/a	DEC: 0.083 arcsec/a	±0.001 arcsec/a in RA ±0.001 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0007 arcsec/a	DEC: 0.082 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.1 (accuracy: 2 decimals)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".

spectral information:

spectral class	F2
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	FK4, catalogue number: 154
Durchmusterung	BD-07 764
Boss General Catalogue	5056
Henry Draper Catalogue	26574

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

position:

position (equinox 1950.0)

RA: 4h 9min 25.3sec

DEC: -6° 58' 0''

variability informations:

variability type	DSCTC	pulsating variable star
magnitute at max. brightness	4
magnitute at min. brightness	4.05
photometric system	visual, photovisual or Johnson's V
period [d]	0.0815

spectral information

spectral class

F2II-III

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	36/90151
constellation	Eridanus
notes on existence	The star is equivalent to '0369016 pi'.
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.