V0380 Cephei

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

position, motion, parallax:

position (J2000)	RA: 21h 1min 36.94sec	DEC: +68° 9' 47.87''	ą0.2 arcsec	source: 15
position (2000.74)	RA: 21h 1min 38sec	DEC: +68° 9' 58''	JD: 2451813.20
proper motion (J2000)	RA: 0.0015 arcsec/a	DEC: -0.002 arcsec/a		source: 15
radial velocity	-3.3 km/s			source: 15
galactic coord. (B1950)	longitude: 104.06°	latitude: 14.19°

magnitude:

visual	7.36 (observed)	source: 20
photovisual	7.2	source: 2
photographic	7.5	source: 16

spectral information:

spectral class	B5		source: 96
Morgan-Keenan	B2V		source: 98
B-magnitude	7.74 ą0.011	B-V-magnitude	0.38
U-magnitude	7.35 ą0.007	U-B-magnitude	-0.39

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
15	FK5, FK5 Extension and FK5 Supplement
Fricke, W., H. Schwan and T. Lederle, "Fifth Fundamental Catalogue (FK5), Part I. The Basic Fundamental Stars," Veroff. Astronomisches Recheninstitut, No. 32, Heidelberg, Germany, 1988, and Fricke, W., H. Schwan, and T.E. Corbin, "Fifth Fundamental Catalogue (FK5), Part II. The FK5 Extension," Veröff. Astronomisches Recheninstitut, No. 33, Heidelberg, Germany, 1991
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
96	SAO or HD/HDE Catalog
Reference from Value 1 or Reference from Value 2
98	SKYMAP Master Catalog Version 3.7
Reference from Value 97 [original data sources Catalog Version 3.7 are identified in SKYMAP Version 3.7]

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

position and proper motion:

position (B1950)	RA: 21h 0min 59.7sec	DEC: +67° 57' 55.5''	ą0.032 arcsec
position (2000.74)	RA: 21h 1min 38sec	DEC: +68° 9' 58''	JD: 2451813.20
position (J2000)	RA: 21h 1min 36.933sec	DEC: +68° 9' 48.3''
proper motion B1950 (FK4)	RA: 0.001 arcsec/a	DEC: 0.01 arcsec/a	ą0.007 arcsec/a in RA ą0.009 arcsec/a in DEC
proper motion J2000 (FK5)	RA: 0.0014 arcsec/a	DEC: 0.006 arcsec/a
source of proper motion data	Determined by source catalog

magnitude:

visual	7.2 (accuracy: 2 decimals)
source of visual magnitude data	Taken from Harvard or San Luis photometry.

spectral information:

spectral class	B5
source of spectral data	Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue	GC, catalogue number: 29401
Durchmusterung	BD+67 1283
Boss General Catalogue	29401
Henry Draper Catalogue	200775

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

position:

position (equinox 1950.0)

RA: 21h 0min 59.7sec

DEC: +67° 57' 56''

variability informations:

variability type	INA	eruptive variable star
magnitute at max. brightness	7.1
magnitute at min. brightness	7.36
photometric system

references

to a study	Yu.K.Bergner, A.S.Miroshnichenko, R.V.Yudin, N.Yu.Yutanov, K.S.Kuratov, D.B. Mukanov, Astr Tsirk No.1396, 1, 1985.
to a chart/photograph	V.S.Shevchenko, M.A.Ibragimov, S.D.Yakubov, Soviet Astronomy 33, No.5, 487, 1989 = Astr Zh (USSR) 66, No.5, 941, 1989.

miscanellous

ID in the GCVS catalogue	20/380
constellation	Cepheus
notes on existence	The star is equivalent to '72470'.

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".