RZ Velorum

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

position, motion, parallax:

position (J2000)	RA: 8h 37min 1.327sec	DEC: -44° 6' 53.05''	ą0.19 arcsec	source: 16
position (2000.72)	RA: 8h 37min 2sec	DEC: -44° 7' 2''	JD: 2451806.24
proper motion (J2000)	RA: 0.0003 arcsec/a	DEC: 0.001 arcsec/a		source: 16
radial velocity	26 km/s			source: 26
galactic coord. (B1950)	longitude: 262.89°	latitude: -1.91°

magnitude:

visual	6.42 (observed)	source: 30
photovisual	7.2	source: 16

spectral information:

spectral class	K0		source: 96
Morgan-Keenan	G1Ib		source: 26
B-magnitude	7.11 ą0.2	B-V-magnitude	0.69
U-magnitude	8.16 ą0.2	U-B-magnitude	1.05

variability information:

source of data: 30

variability type	111
var. amplitude	1.22
var. period	20.4
var. epoch	2434846 13. April 1954, 12:00:00 UT
next max light	2451818.8 1. October 2000, 07:12:00 UT

sources:

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
26	Bright Star Supplement
Hoffleit, D. and Warren, W.H. Jr., A Supplement to the Bright Star Catalogue, 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: 8h 35min 17.673sec	DEC: -43° 56' 21.35''	ą0.061 arcsec
position (2000.72)	RA: 8h 37min 3sec	DEC: -44° 7' 1''	JD: 2451806.24
position (J2000)	RA: 8h 37min 1.182sec	DEC: -44° 6' 52.49''
proper motion B1950 (FK4)	RA: -0.0018 arcsec/a	DEC: 0.002 arcsec/a	ą0.012 arcsec/a in RA ą0.009 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0012 arcsec/a	DEC: 0.004 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

photographic	7.5 (accuracy: 1 decimal)
source of photographic magnitude data	Source cited in source catalog introduction.

spectral information:

spectral class	K0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in photographic magnitude in source catalog

catalogues

source catalogue	GC, catalogue number: 11834
Durchmusterung	CD-43 4474
Boss General Catalogue	11834
Henry Draper Catalogue	73502

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

position:

position (equinox 1950.0)

RA: 8h 35min 17.7sec

DEC: -43° 56' 21''

variability informations:

variability type	DCEP	pulsating variable star
magnitute at max. brightness	6.42
magnitute at min. brightness	7.64
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2434845.57 13. April 1954, 01:40:48 UT
period [d]	20.39824
next maximum light [JD]	2451816.90568 29. September 2000, 09:44:11 UT
rising time	30 % of period

spectral information

spectral class

G1Ib-G8

references

to a study	Vol. I GCVS (see Kholopov et al. 1985-1988)
to a chart/photograph	Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue	85/18
constellation	Vela
notes on existence	The star is equivalent to '0850019 SS'.

variability type description

variability type

description

DCEP

These are the classical cepheids, or Delta Cep-type variables. Comparatively young objects that have left the main sequence and evolved into the instability strip of the Hertzsprung-Russell (H-R) diagram, they obey the well-known Cepheid period-luminosity relation and belong to the young disk population. DCEP stars are present in open clusters. They display a certain relation between the shapes of their light curves and their periods.