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

U Mon, HD 59693, SAO 134775, BD -9 2085

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

position, motion, parallax:

position (J2000)	RA: 7h 30min 47.469sec	DEC: -9° 46' 36.73''	±0.19 arcsec	source: 16
position (2000.72)	RA: 7h 30min 49sec	DEC: -9° 46' 43''	JD: 2451809.28
proper motion (J2000)	RA: -0.0001 arcsec/a	DEC: 0.007 arcsec/a		source: 16
radial velocity	36.4 km/s			source: 11
trigonometric parallax	0.002 arcsec		-	source: 26
galactic coord. (B1950)	longitude: 226.15°	latitude: 4.15°

magnitude:

visual	5.82 (observed)	source: 26
photovisual	5.8	source: 16

spectral information:

spectral class	G5		source: 96
Morgan-Keenan	F8Ibe		source: 26
B-magnitude	7 ±0.2	B-V-magnitude	1.18
U-magnitude	8.22 ±0.2	U-B-magnitude	1.22

variability information:

source of data: 30

variability type	132
var. amplitude	2.7
var. period	91.32
var. epoch	2438496 10. April 1964, 12:00:00 UT
next max light	2451828.72 11. October 2000, 05:16:48 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
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: 7h 28min 24.264sec	DEC: -9° 40' 15.41''	±0.034 arcsec
position (2000.72)	RA: 7h 30min 49sec	DEC: -9° 46' 42''	JD: 2451809.28
position (J2000)	RA: 7h 30min 47.362sec	DEC: -9° 46' 37.31''
proper motion B1950 (FK4)	RA: -0.0016 arcsec/a	DEC: -0.004 arcsec/a	±0.008 arcsec/a in RA ±0.008 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0012 arcsec/a	DEC: 0 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	5.6 (accuracy: 1 decimal)
source of visual magnitude data	Source cited in source catalog introduction.

spectral information:

spectral class	G5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue	GC, catalogue number: 10054
Durchmusterung	BD-09 2085
Boss General Catalogue	10054
Henry Draper Catalogue	59693

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

position:

position (equinox 1950.0)

RA: 7h 28min 24.3sec

DEC: -9° 40' 15''

variability informations:

variability type	RVB	pulsating variable star
magnitute at max. brightness	6.1
magnitute at min. brightness	8.8
photometric system	photographic magnitudes
epoch for maximum light [JD]	2438496 10. April 1964, 12:00:00 UT
period [d]	91.32
next maximum light [JD]	2451828.72 11. October 2000, 05:16:48 UT
rising time	22 % of period

spectral information

spectral class

F8eVIb-K0pIb(M2)

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	55/4
constellation	Monoceros
notes on existence	The star is equivalent to '0550005 V'.
There are notes in published catalog.

variability type description

variability type

description

RVB

Variables of the RV Tauri type. These are radially pulsating supergiants having spectral types F-G at maximum light and K-M at minimum. The light curves are characterized by the presence of double waves with alternating primary and secondary minima that can vary in depth so that primary minima may become secondary and vice versa. The complete light amplitude may reach 3-4 mag in V. Periods between two adjacent primary minima (usually called formal periods) lie in the range 30-150 days (these are the periods appearing in the Catalogue). Two subtypes, RVA and RVB, are recognized: RVA RV Tauri variables that do not vary in mean magnitude (AC Her); RVB RV Tauri variables that periodically (with periods from 600 to 1500 days and amplitudes up to 2 mag in V) vary in mean magnitude (DF Cyg, RV Tau).