CS Eridani

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

position, motion, parallax:

position (J2000)	RA: 2h 37min 5.772sec	DEC: -42° 57' 48.3''	ą0.18 arcsec	source: 16
position (2000.73)	RA: 2h 37min 8sec	DEC: -42° 57' 37''	JD: 2451810.88
proper motion (J2000)	RA: 0.0088 arcsec/a	DEC: 0.001 arcsec/a		source: 16
galactic coord. (B1950)	longitude: 256.31°	latitude: -63.39°

magnitude:

visual	8.75 (observed)	source: 30
photovisual	9.1	source: 16

spectral information:

spectral class	A2		source: 96
Morgan-Keenan	A2/3(IIw)		source: 10

variability information:

source of data: 30

variability type	122
var. amplitude	0.56
var. period	0.31
var. epoch	2438417 22. January 1964, 12:00:00 UT
next max light	2451811.17 23. September 2000, 16:04:48 UT

sources:

10	Michigan Catalog of 2-Dimensional Spectral Types for the HD Stars, Volumes I-III
Houk, N., and A.P. Cowley, Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 1., (Zones -89 to -53 Degrees), Ann Arbor: The University of Michigan, 1975, and Houk, N., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 2., (Zones -52 to -40 Degrees), Ann Arbor: The University of Michigan, 1978, and Houk, N., Michigan Catalogue of 2-Dimensional Spectral Types for the HD Stars, Vol. 3., (Zones -40 to -26 Degrees), Ann Arbor: The University of Michigan, 1982
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
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: 2h 35min 10.864sec	DEC: -43° 10' 47.27''	ą0.065 arcsec
position (2000.73)	RA: 2h 37min 7sec	DEC: -42° 57' 37''	JD: 2451810.88
position (J2000)	RA: 2h 37min 5.699sec	DEC: -42° 57' 48.28''
proper motion B1950 (FK4)	RA: 0.008 arcsec/a	DEC: 0.009 arcsec/a	ą0.012 arcsec/a in RA ą0.012 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0085 arcsec/a	DEC: 0.004 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	9.2 (accuracy: 1 decimal)
source of visual magnitude data	Taken from the "Henry Draper Catalogue".
photographic	9 (accuracy: 1 decimal)
source of photographic magnitude data	Taken from magnitudes of the CPD and diameters of the Cape Astrographic Catalogue

spectral information:

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

catalogues

source catalogue	Cape Zone, catalogue number: 1229
Durchmusterung	CP-43 273
Henry Draper Catalogue	16456

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

position:

position (equinox 1950.0)

RA: 2h 35min 10.9sec

DEC: -43° 10' 47''

variability informations:

variability type	RRC	pulsating variable star
magnitute at max. brightness	8.75
magnitute at min. brightness	9.31
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2438417.087 22. January 1964, 14:05:17 UT
period [d]	0.311331
next maximum light [JD]	2451811.169282 23. September 2000, 16:03:46 UT
rising time	47 % of period

spectral information

spectral class

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	36/119
constellation	Eridanus
notes on existence	The star is equivalent to '0360120 CT'.
There are notes in published catalog.

variability type description

variability type

description

RRC

Variables of the RR Lyrae type, which are radially-pulsating giant A-F stars having amplitudes from 0.2 to 2 mag in V. Cases of variable light-curve shapes as well as variable periods are known. If these changes are periodic, they are called the "Blazhko effect."

Traditionally, RR Lyrae stars are sometimes called short-period Cepheids or cluster-type variables. The majority of these stars belong to the spherical component of the Galaxy; they are present, sometimes in large numbers, in some globular clusters, where they are known as pulsating horizontal-branch stars. Like Cepheids, maximum expansion velocities of surface layers for these stars practically coincide with maximum light.

RR(B)
RR Lyrae variables showing two simultaneously operating pulsation modes, the fundamental tone with the period P0 and the first overtone, P1 (AQ Leo). The ratio P1/P0 is approximately 0.745;

RRAB
RR Lyrae variables with asymmetric light curves (steep ascending branches), periods from 0.3 to 1.2 days, and amplitudes from 0.5 to 2 mag in V;

RRC
RR Lyrae variables with nearly symmetric, sometimes sinusoidal, light curves, periods from 0.2 to 0.5 days, and amplitudes not greater than 0.8 mag in V (SX UMa).