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

MT Tel, HD 176387, SAO 229444, CP -46 9578

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

position, motion, parallax:

position (J2000)	RA: 19h 2min 12.281sec	DEC: -46° 39' 12.24''	±0.18 arcsec	source: 16
position (2000.73)	RA: 19h 2min 15sec	DEC: -46° 39' 8''	JD: 2451810.88
proper motion (J2000)	RA: -0.0135 arcsec/a	DEC: -0.119 arcsec/a		source: 16
galactic coord. (B1950)	longitude: 350.25°	latitude: -21.12°

magnitude:

visual	8.68 (observed)	source: 30
photovisual	9.4	source: 16

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	A0w		source: 10

variability information:

source of data: 30

variability type	122
var. amplitude	0.6
var. period	0.32
var. epoch	2442206 7. June 1974, 12:00:00 UT
next max light	2451811.12 23. September 2000, 14:52:48 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: 18h 58min 30.762sec	DEC: -46° 43' 27.33''	±0.061 arcsec
position (2000.73)	RA: 19h 2min 16sec	DEC: -46° 39' 2''	JD: 2451810.88
position (J2000)	RA: 19h 2min 12.353sec	DEC: -46° 39' 11.96''
proper motion B1950 (FK4)	RA: -0.0127 arcsec/a	DEC: -0.109 arcsec/a	±0.012 arcsec/a in RA ±0.012 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0127 arcsec/a	DEC: -0.113 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	8.8 (accuracy: 1 decimal)
source of visual magnitude data	Determined by source catalog or by authority in footnote.
photographic	9.5 (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	A0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	Cape Zone, catalogue number: 17877
Durchmusterung	CP-46 9578
Henry Draper Catalogue	176387

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

position:

position (equinox 1950.0)

RA: 18h 58min 30.8sec

DEC: -46° 43' 27''

variability informations:

variability type	RRC	pulsating variable star
magnitute at max. brightness	8.68
magnitute at min. brightness	9.28
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2442206.35 7. June 1974, 20:24:00 UT
period [d]	0.316897
next maximum light [JD]	2451811.181173 23. September 2000, 16:20:53 UT
rising time	35 % of period

spectral information

spectral class

A0w

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	79/282
constellation	Telescopium
notes on existence	The star is equivalent to '0790283 MU'.
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).