catalogues and names

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

Combined General Catalogue of Variable Stars (Vol. I-III)

catalogues and names

catalogues and names

X Ari, HD 19510, SAO 93297, BD +9 398

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

position, motion, parallax:

position (J2000)	RA: 3h 8min 30.882sec	DEC: +10° 26' 45.42''	±0.43 arcsec	source: 16
position (2000.73)	RA: 3h 8min 33sec	DEC: +10° 26' 55''	JD: 2451810.88
proper motion (J2000)	RA: 0.0045 arcsec/a	DEC: -0.086 arcsec/a		source: 16
radial velocity	-40 km/s			source: 11
galactic coord. (B1950)	longitude: 169.09°	latitude: -39.84°

magnitude:

visual	8.97 (observed)	source: 30
photographic	9.2	source: 16

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	A8-F4		source: 30
B-magnitude	9.3 ±0.013	B-V-magnitude	0.29
U-magnitude	9.48 ±0.019	U-B-magnitude	0.18

variability information:

source of data: 30

variability type	121
var. amplitude	0.98
var. period	0.65
var. epoch	2437584 11. October 1961, 12:00:00 UT
next max light	2451811.2 23. September 2000, 16:48:00 UT

sources:

11	General Catalogue of Stellar Radial Velocities
Wilson, R.E., General Catalogue of Stellar of Stellar Radial Radial Velocities, Washington, DC: Carnegie Institute of Washington, 1953
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: 3h 5min 48.042sec	DEC: +10° 15' 23.8''	±0.018 arcsec
position (2000.73)	RA: 3h 8min 33sec	DEC: +10° 27' 0''	JD: 2451810.88
position (J2000)	RA: 3h 8min 30.962sec	DEC: +10° 26' 46.28''
proper motion B1950 (FK4)	RA: 0.0054 arcsec/a	DEC: -0.07 arcsec/a	±0.006 arcsec/a in RA ±0.006 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0055 arcsec/a	DEC: -0.074 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	9 (accuracy: 1 decimal)
source of visual magnitude data	Taken from AGK1.

spectral information:

spectral class	A2
source of spectral data	Classified at Leander McCormick Observatory.

catalogues

source catalogue	Yale Transactions 22 Part II, catalogue number: 1170
Durchmusterung	BD+09 398
Henry Draper Catalogue	19510

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

position:

position (equinox 1950.0)

RA: 3h 5min 48sec

DEC: +10° 15' 24''

variability informations:

variability type	RRAB	pulsating variable star
magnitute at max. brightness	8.97
magnitute at min. brightness	9.95
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2437583.57 11. October 1961, 01:40:48 UT
period [d]	0.6511426
next maximum light [JD]	2451811.03581 23. September 2000, 12:51:34 UT
rising time	13 % of period

spectral information

spectral class

A8-F4

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	7/7
constellation	Aries
notes on existence	The star is equivalent to '0070008 Y'.
There are notes in published catalog.

variability type description

variability type

description

RRAB

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).