catalogues and names

The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

SKY2000 - Master Star Catalog

Smithsonian Astrophysical Observatory Star Catalog

The Washington Visual Double Star Catalog, 1996.0

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

catalogues and names

catalogues and names	TZ Tri, 6 Tri, HR 642, HD 13480, SAO 55347, BD +29 371, WDS 02124+3018
constellation	Triangulum

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

position, motion, parallax:

position (J2000)	RA: 2h 12min 22.3sec	DEC: +30° 18' 11''
position (B1900)	RA: 2h 6min 34sec	DEC: +29° 50' 4''
proper motion (J2000)	RA: -0.064 arcsec/a	DEC: -0.063 arcsec/a
radial velocity	-18 km/s note: spectroscopic binaries note: orbital data avaible
rotational velocity	36 km/s (uncertain) (variable)
trigonometric parallax	0.004 arcsec
galactic coordinates	longitude: 142.98°	latitude: -29.4°

note (category: dynamical parallaxes):

0.007".

magnitude

visual magnitude

4.94 (V on UBV Johnson system)

spectral / color information

spectral class	G5III+F5V
B-V-magnitude	0.78
U-B-magnitude	0.31
IR-note	object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

variability information

variable star identification

TZ Tri

note (category: variability):

Amp. 0.075V pulsating?

double/multiple star system information

separation	3.8 arcsec
mag difference (of double or brightest multiple)	1.6

note (category: double and multiple data):

Binary. Companion F6V.

note (category: spectroscopic binaries):

Comp. A: 14.732d, K 56.5k/s, V0 -19.1k/s, msin3i 1.12, asini 11.4; comp. B: 2.2365d, K 95.4k/s, V0 -19.8k/s, msin3i 0.905, asini 2.93.

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

position, motion, parallax:

position (J2000)	RA: 2h 12min 22.325sec	DEC: +30° 18' 10.58''	±0.43 arcsec	source: 16
proper motion (J2000)	RA: -0.0048 arcsec/a	DEC: -0.07 arcsec/a		source: 25
radial velocity	-18 km/s			source: 25
trigonometric parallax	0.004 arcsec		-	source: 25
galactic coord. (B1950)	longitude: 142.98°	latitude: -29.4°

magnitude:

visual	5.19 (observed)	source: 30
photovisual	5.2	source: 2
photographic	5.8	source: 16

spectral information:

spectral class	G0		source: 96
Morgan-Keenan	G5III+F5V		source: 25
B-magnitude	5.72 ±0.05	B-V-magnitude	0.78
U-magnitude	6.03 ±0.05	U-B-magnitude	0.31

variability information:

source of data: 30

variability type	10
var. amplitude	0.09
var. period	14.73
var. epoch	2443730 9. August 1978, 12:00:00 UT
next max light	2452229.21 15. November 2001, 17:02:24 UT

double/multiple star system information:

source of data: 19

separation between brightest and second brightest component	4 arcsec
magnitude difference between brightest and second brightest component	1.4
position angle	70 °

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
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
19	WDS Catalog
Worley, C.E., and G.G. Douglass, Washington Catalog of Visual Double Stars 1996.0, United States Naval Observatory, 1996
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: 2h 9min 27.759sec	DEC: +30° 4' 10.9''	±0.015 arcsec
position (J2000)	RA: 2h 12min 22.279sec	DEC: +30° 18' 10.72''
proper motion B1950 (FK4)	RA: -0.0049 arcsec/a	DEC: -0.059 arcsec/a	±0.003 arcsec/a in RA ±0.002 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0049 arcsec/a	DEC: -0.063 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.4 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	G0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue	GC, catalogue number: 2633
Durchmusterung	BD+29 371
Boss General Catalogue	2633
Henry Draper Catalogue	13480

data from The Washington Visual Double Star Catalog, 1996.0 (Worley+, 1996)

position and proper motion:

position (J2000)	RA: 2h 12.4min	DEC: +30° 18'
proper motion (J2000)	RA: -0.059 arcsec/a	DEC: -0.065 arcsec/a

double/multiple star system information:

component	year	number of measures	position angle	angular separation	magnitude of 1st component	magnitude of 2nd component	spectral class(es)	discoverer code
-	1830	often	80°	3.8''	5.2	6.6	G0III	STF 227
	1994		70°	4''

discoverer information:

discoverer code	discoverer	reference
STF 227	Struve, F.G.W.	-

notes:

note	Iota Tri. A is a spectroscopic binary, P = 14.73d. B is also a spectroscopic binary, P = 2.24d. One component is variable: TZ Tri.

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

position:

position (equinox 1950.0)

RA: 2h 9min 27.8sec

DEC: +30° 4' 11''

variability informations:

variability type	ELL/RS	rotating variable star eruptive variable star
magnitute at max. brightness	5.19
magnitute amplitude	0.09
photometric system	visual, photovisual or Johnson's V
epoch for maximum light [JD]	2443729.8 9. August 1978, 07:12:00 UT
period [d]	14.732
next maximum light [JD]	2452230.164 16. November 2001, 15:56:10 UT

spectral information

spectral class

G5III+G5III:

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 'Bonner Durchmusterung'

miscanellous

ID in the GCVS catalogue	80/33
constellation	Triangulum
notes on existence	The star is equivalent to '0800034 UU'.
There are notes in published catalog.

variability type description

variability type	description
ELL	Rotating ellipsoidal variables (b Per, Alpha Vir). These are close binary systems with ellipsoidal components, which change combined brightnesses with periods equal to those of orbital motion because of changes in emitting areas toward an observer, but showing no eclipses. Light amplitudes do not exceed 0.1 mag in V.
RS	Eruptive variables of the RS Canum Venaticorum type. This type is ascribed to close binary systems with spectra showing Ca II H and K in emission, their components having enhanced chromospheric activity that causes quasi-periodic light variability. The period of variation is close to the orbital one, and the variability amplitude is usually as great as 0.2 mag in V (UX Ari). They are X-ray sources and rotating variables. RS CVn itself is also an eclipsing system.