Z Canis Majoris

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

position, motion, parallax:

position (J2000)	RA: 7h 3min 43.142sec	DEC: -11° 33' 6.15''	ą0.18 arcsec	source: 16
position (2000.74)	RA: 7h 3min 45sec	DEC: -11° 33' 10''	JD: 2451813.20
proper motion (J2000)	RA: -0.0009 arcsec/a	DEC: 0.005 arcsec/a		source: 16
radial velocity	44 km/s			source: 11
galactic coord. (B1950)	longitude: 224.61°	latitude: -2.56°

magnitude:

visual	9.3 (observed)	source: 20
photovisual	9	source: 16
photographic	8.9	source: 2

spectral information:

spectral class	B5		source: 95
B-magnitude	10.5 ą0.019	B-V-magnitude	1.2
U-magnitude	11.08 ą0.067	U-B-magnitude	0.58

variability information:

source of data: 30

variability type	271
var. amplitude	2.4

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
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
20	Catalogue of Homogeneous Means in the UBV System
Mermilliod, J.C., Catalogue of Homogeneous Means in the UBV System, Institut d'Astronomie, Universite de Lausanne, 1994
30	GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
95	Michigan Catalog of 2-Dimensional Spectral Types, Volumes I-III or Catalog of Selected Spectral Type
"Catalogue of Selected Spectral Types in the MK System," Centre de Donnees Stellaires Information Bulletin, Vol. 15, p. 121, 1978

data from Smithsonian Astrophysical Observatory Star Catalog (SAO Staff 1966; USNO, ADC 1990)

position and proper motion:

position (B1950)	RA: 7h 1min 22.566sec	DEC: -11° 28' 35.92''	ą0.035 arcsec
position (2000.74)	RA: 7h 3min 46sec	DEC: -11° 33' 10''	JD: 2451813.20
position (J2000)	RA: 7h 3min 43.154sec	DEC: -11° 33' 4.8''
proper motion B1950 (FK4)	RA: -0.0014 arcsec/a	DEC: 0.021 arcsec/a	ą0.018 arcsec/a in RA ą0.02 arcsec/a in DEC
proper motion J2000 (FK5)	RA: -0.0009 arcsec/a	DEC: 0.024 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	8.6 (accuracy: 1 decimal)
source of visual magnitude data	Taken from AGK1.

spectral information:

spectral class	Bp
source of spectral data	Taken from the HD with M stars reclassified by Miss Cannon.

catalogues

source catalogue	Yale Transactions 11, catalogue number: 2351
Durchmusterung	BD-11 1760
Henry Draper Catalogue	53179

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

position:

position (equinox 1950.0)

RA: 7h 1min 22.6sec

DEC: -11° 28' 36''

variability informations:

variability type	INA	eruptive variable star
magnitute at max. brightness	8.8
magnitute at min. brightness	11.2
photometric system	photographic magnitudes

spectral information

spectral class

B8peq

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	14/9
constellation	Canis Major
notes on existence	The star is equivalent to '0140010 RR'.
There are notes in published catalog.

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".