Seginus


The object was found in the following catalogues:
  1. The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version)

  2. SKY2000 - Master Star Catalog

  3. Smithsonian Astrophysical Observatory Star Catalog

  4. The Washington Visual Double Star Catalog, 1996.0

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


catalogues and names Seginus, g Boo, gam Boo, 27 Boo, HR 5435, HD 127762, SAO 64203, FK5: 535, WDS 14321+3818A
other names Ceginus, Haris in Becvar
constellation Bootes

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

note (category: star names): Seginus; Ceginus; Haris in Becvar.

object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978)

position, motion, parallax:

position (J2000) RA: 14h 32min 4,7sec DEC: +38 18' 30''
position (J1900) RA: 14h 28min 3sec DEC: +38 44' 44''
proper motion (J2000) RA: -0,114 arcsec/a DEC: 0,153 arcsec/a
radial velocity -37 km/s
note: variable radial velocity
rotational velocity 139 km/s (uncertain) (variable)
trigonometric parallax 0,025 arcsec
note (category: radial and/or rotational velocities): Varies in period of 0.25d.

magnitude

visual magnitude 3,03
(V on UBV Johnson system)

spectral / color information

spectral class A7III
B-V-magnitude 0,19
U-B-magnitude 0,12
R-I-magnitude 0,08

variability information

variable star identification Gam Boo
note (category: variability): Delta Sct 3.02 - 3.07V, 3.23 - 3.28B, 3.20 - 3.25p, 0.2903137d. Hydrogen and Ca lines vary.

double/multiple star system information

number of components of multiple star system 3
separation 33,4 arcsec
mag difference (of double or brightest multiple) 9,5
note (category: double and multiple data): Primary found double by speckle interferometry, sep. 0.069". Component B, optical.

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

position, motion, parallax:

position (J2000) RA: 14h 32min 4,674sec DEC: +38 18' 29,74'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0097 arcsec/a DEC: 0,153 arcsec/a source: 25
radial velocity -37 km/s source: 25
trigonometric parallax 0,025 0,002 arcsec source: 25
galactic coord. (B1950) longitude: 67,24 latitude: 66,17
GCI unit vector (J2000) X: -0,618178 Y: -0,483312 Z: 0,619892

magnitude:

visual 3,03 (observed) source: 25
photovisual 3 source: 2

spectral information:

spectral class F0 source: 96
Morgan-Keenan A7III source: 25
B-magnitude 3,22 0,05 B-V-magnitude 0,19
U-magnitude 3,34 0,05 U-B-magnitude 0,12

variability information:

source of data: 30
variability type 10
var. amplitude 0,05
var. period 0,29

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 0,2 arcsec
position angle 178

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
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 (J1950) RA: 14h 30min 3,837sec DEC: +38 31' 34,12'' 0,004 arcsec
position (J2000) RA: 14h 32min 4,679sec DEC: +38 18' 29,7''
proper motion J1950 (FK4) RA: -0,0099 arcsec/a DEC: 0,149 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0096 arcsec/a DEC: 0,153 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class F0
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 535
Durchmusterung BD+38 2565
Boss General Catalogue 19607
Henry Draper Catalogue 127762

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

position and proper motion:

position (J2000) RA: 14h 32,1min DEC: +38 18'
proper motion (J2000) RA: -0,114 arcsec/a DEC: 0,153 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
Aa 1975 2 78 0,1'' 3,03 - A7III BLM
1984 178 0,2''
Aa-B 1878 - 99 26,2'' 3,03 12,7 - BU 616
1925 111 33,4''

discoverer information:

discoverer code discoverer reference
BLM Morgan, B. et al
BU 616 Burnham, S.W. -

notes:

note Gamma Boo. A is a Delta Scuti-type system.

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

position:

position (J1950) RA: 14h 30min 3,8sec DEC: +38 31' 34''

variability informations:

variability type DSCTC: pulsating variable star
magnitute at max. brightness 3,02
magnitute at min. brightness 3,07
photometric system visual, photovisual or Johnson's V
period [d] 0,2903137
rising time 50 % of period (uncertain)

spectral information

spectral class A7III

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 9/9003
constellation Bootes
notes on existence The star is equivalent to '0099009 iot'.
There are notes in published catalog.

variability type description

variability type description
DSCTC Variables of the Delta Scuti type. These are pulsating variables of spectral types A0-F5 III-V displaying light amplitudes from 0.003 to 0.9 mag in V (usually several hundredths of a magnitude) and periods from 0.01 to 0.2 days. The shapes of the light curves, periods, and amplitudes usually vary greatly. Radial as well as nonradial pulsations are observed. The variability of some
members of this type appears sporadically and sometimes completely ceases, this being a consequence of strong amplitude modulation with the lower value of the amplitude not exceeding 0.001 mag in some cases. The maximum of the surface layer expansion does not lag behind the maximum light for more than 0.1 periods. DSCT stars are representatives of the galactic disk (flat component) and are phenomenologically close to the SX Phe variables.

DSCTC
Low amplitude group of Delta Sct variables (light amplitude <0.1 mag in V). The majority of this type's representatives are stars of luminosity class V; objects of this subtype generally are representative of the Delta Sct variables in open clusters.