CU Chamaeleontis

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

position, motion, parallax:

position (J2000)	RA: 11h 8min 3.268sec	DEC: -77° 39' 17.02''	ą0.18 arcsec	source: 16
position (2000.74)	RA: 11h 8min 4sec	DEC: -77° 39' 31''	JD: 2451813.20
proper motion (J2000)	RA: -0.0073 arcsec/a	DEC: 0.01 arcsec/a		source: 16
galactic coord. (B1950)	longitude: 297.37°	latitude: -15.91°

magnitude:

visual	8.38 (observed)	source: 30
photovisual	8.6	source: 16

spectral information:

spectral class	A0		source: 96
Morgan-Keenan	A0peShell		source: 10
B-magnitude	8.8 ą0.01	B-V-magnitude	0.35
U-magnitude	9.05 ą0.032	U-B-magnitude	0.25

variability information:

source of data: 30

variability type	271
var. amplitude	0.1

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: 11h 6min 39.61sec	DEC: -77° 23' 1.21''	ą0.144 arcsec
position (2000.74)	RA: 11h 8min 6sec	DEC: -77° 39' 31''	JD: 2451813.20
position (J2000)	RA: 11h 8min 5.327sec	DEC: -77° 39' 16.79''
proper motion B1950 (FK4)	RA: 0.0165 arcsec/a	DEC: 0.013 arcsec/a	ą0.025 arcsec/a in RA ą0.036 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0151 arcsec/a	DEC: 0.015 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	9.2 (accuracy: 1 decimal)
source of visual magnitude data	Determined by source catalog.

spectral information:

spectral class	A0
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	Melbourne 4, catalogue number: 2456
Durchmusterung	CP-76 654
Henry Draper Catalogue	97048

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

position:

position (equinox 1950.0)

RA: 11h 6min 39.6sec

DEC: -77° 23' 1''

variability informations:

variability type	INA	eruptive variable star
magnitute at max. brightness	8.38
magnitute at min. brightness	8.48
photometric system	visual, photovisual or Johnson's V

spectral information

spectral class

B9-A0Vpe

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	22/121
constellation	Chamaeleon
notes on existence	The star is equivalent to '0220122 CV'.

variability type description

variability type

description

INA

Orion variables. Irregular, eruptive variables connected with bright or dark diffuse nebulae or observed in the regions of these nebulae. Some of them may show cyclic light variations caused by axial rotation. In the Spectrum-Luminosity diagram, they are found in the area of the main sequence and subgiants. They are probably young objects that, during the course of further evolution, will become light-constant stars on the zero-age main
sequence (ZAMS). The range of brightness variations may reach several magnitudes. In the case of rapid light variations having been observed (up to 1 mag in 1-10 days), the letter "S" is added to the symbol for the type (INS).
This type may be divided into the following subtypes: INA, INB, INT, IN(YY).

INA
Orion variables of early spectral types (B-A or Ae). They are often characterized by occasional abrupt Algol-like fadings (T Ori);

INB
Orion variables of intermediate and late spectral types, F-M or Fe-Me (BH Cep, AH Ori). F-type stars may show Algol-like fadings similar to those of many INA stars; K-M stars may produce flares along with irregular light variations;

INT
Orion variables of the T Tauri type. Stars are assigned to this type on the basis of the following (purely spectroscopic) criteria: spectral types are in the range Fe-Me. The spectra of most typical stars resemble the spectrum of the solar chromosphere. The feature specific to the type is the presence of
the flourescent emission lines Fe II 4046, 4132 A (anomalously intense in the spectra of these stars), emission lines [Si II] and [O I], as well as the absorption line Li I 6707 A. These variables are usually observed only in diffuse nebulae. If it is not apparent that the star is associated with a nebula, the letter "N" in the symbol for the type may be omitted, e.g., IT (RW AUR);

IN(YY)
Some Orion variables (YY Ori) show the presence of absorption components on the redward sides of emission lines, indicating the infall of matter toward the stars' surfaces. In such cases, the symbol for the type may be accompanied by the symbol "YY".