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	t9Eri, tau 9 Eri, 36 Eri, HR 1240, HD 25267, SAO 169017, CD -24 2022, FK5: 2287
constellation	Eridanus

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

position, motion, parallax:

position (J2000)	RA: 3h 59min 55.5sec	DEC: -24° 0' 59''
position (2000.72)	RA: 3h 59min 58sec	DEC: -24° 0' 52''
position (B1900)	RA: 3h 55min 39.6sec	DEC: -24° 17' 59''
proper motion (J2000)	RA: 0.015 arcsec/a	DEC: 0.015 arcsec/a
radial velocity	24 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	25 km/s (uncertain) (variable)
trigonometric parallax	0.015 arcsec
galactic coordinates	longitude: 219.65°	latitude: -47.62°

magnitude

visual magnitude

4.66 (V on UBV Johnson system)

spectral / color information

spectral class	B6V+B9.5V
B-V-magnitude	-0.13
U-B-magnitude	-0.42
R-I-magnitude

note (category: spectra):

Also classified A0pSi.

variability information

variable star identification

Tau9 Eri

note (category: variability):

Alpha CV 4.62 - 4.67V, 1.2094d.

double/multiple star system information

note (category: spectroscopic binaries):

5.9537d, K 37.6k/s, V0 +24.9k/s, asini 3.06.

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

position, motion, parallax:

position (J2000)	RA: 3h 59min 55.49sec	DEC: -24° 0' 58.5''	±0.22 arcsec	source: 15
position (2000.72)	RA: 3h 59min 57sec	DEC: -24° 0' 52''	JD: 2451809.25
proper motion (J2000)	RA: 0.0011 arcsec/a	DEC: 0.015 arcsec/a		source: 25
radial velocity	24 km/s			source: 25
trigonometric parallax	0.015 arcsec		±0.002 arcsec	source: 25
galactic coord. (B1950)	longitude: 219.65°	latitude: -47.62°

magnitude:

visual	4.66 (observed)	source: 25
photovisual	4.7	source: 2
photographic	4.7	source: 2

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	B6V+B9.5V		source: 25
B-magnitude	4.53 ±0.05	B-V-magnitude	-0.13
U-magnitude	4.11 ±0.05	U-B-magnitude	-0.42

variability information:

source of data: 30

variability type	160
var. amplitude	0.05
var. period	1.21

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: 3h 57min 47.47sec	DEC: -24° 9' 25.12''	±0.018 arcsec
position (2000.72)	RA: 3h 59min 57sec	DEC: -24° 0' 52''	JD: 2451809.25
position (J2000)	RA: 3h 59min 55.454sec	DEC: -24° 0' 59.08''
proper motion B1950 (FK4)	RA: 0.0004 arcsec/a	DEC: 0.011 arcsec/a	±0.003 arcsec/a in RA ±0.003 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0007 arcsec/a	DEC: 0.009 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	4.7 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	A0p
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 4801
Durchmusterung	CD-24 2022
Boss General Catalogue	4801
Henry Draper Catalogue	25267

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

position:

position (equinox 1950.0)

RA: 3h 57min 47.5sec

DEC: -24° 9' 25''

variability informations:

variability type	ACV	rotating variable star
magnitute at max. brightness	4.62
magnitute at min. brightness	4.67
photometric system	visual, photovisual or Johnson's V
period [d]	1.2094

spectral information

spectral class

A0p(Si)

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 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue	36/90199
constellation	Eridanus
notes on existence	The star is equivalent to '0370001 R'.
There are notes in published catalog.

variability type description

variability type

description

ACV

Alpha2 Canum Venaticorum variables. These are main-sequence stars with spectral types B8p-A7p and displaying strong magnetic fields. Spectra show abnormally strong lines of Si, Sr, Cr, and rare earths whose intensities vary with rotation. They exhibit magnetic field and brightness changes (periods of 0.5-160 days or more). The amplitudes of the brightness changes are usually withine 0.01-0.1 mag in V. ACVO Rapidly oscillating Alpha2 CVn variables. These are nonradially pulsating, rotating magnetic variables of Ap spectral type (DO Eri). Pulsation periods are in the range of 6-12 mmag (0.004-0.01 days), while amplitudes of light variation caused by the pulsation are about 0.01 mag in V. The pulsational variations are superposed on those caused by rotation.