Shaula


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 Shaula, l Sco, lam Sco, 35 Sco, HR 6527, HD 158926, SAO 208954, FK5: 652, WDS 17336-3706A
constellation Scorpius

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

note (category: star names): SHAULA.

position, motion, parallax:

position (J2000) RA: 17h 33min 36,5sec DEC: -37 6' 14''
position (J1900) RA: 17h 26min 49sec DEC: -37 1' 51''
proper motion (J2000) RA: -0,001 arcsec/a DEC: -0,029 arcsec/a
radial velocity -3 km/s
note: spectroscopic binaries, double lined spectra
rotational velocity 163 km/s (uncertain) (variable)

magnitude

visual magnitude 1,63
(V on UBV Johnson system)

spectral / color information

spectral class B2IV+B
B-V-magnitude -0,22
U-B-magnitude -0,89
R-I-magnitude -0,28
note (category: spectra): Lyman alpha and Lyman beta observed from COPERNICUS.
note (category: colors): Color excess E(B-V) = +0.03.

variability information

variable star identification Lam Sco
note (category: variability): Beta C 1.59 - 1.65V, 0.2137015d, secondary 0.1068518d, beat period 10.1605d. Also possible 0.04V eclipse. X-ray flare observed in vicinity Lambda Sco on 1 June 1975.

double/multiple star system information

number of components of multiple star system 3
separation 94,9 arcsec
mag difference (of double or brightest multiple) 10,3
component ID AC
note Worley (1978) update of the IDS
note (category: spectroscopic binaries): 5.6d. Interferometer measures indicate multiple star.

miscellaneous information

note (category: group membership): Sco-Cen assoc.

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

position, motion, parallax:

position (J2000) RA: 17h 33min 36,534sec DEC: -37 6' 13,72'' 0,06 arcsec source: 15
proper motion (J2000) RA: -0,0001 arcsec/a DEC: -0,029 arcsec/a source: 25
radial velocity -3 km/s source: 25
galactic coord. (B1950) longitude: 351,75 latitude: -2,21
GCI unit vector (J2000) X: -0,091637 Y: -0,792262 Z: -0,603261

magnitude:

visual 1,62 (observed) source: 30
photovisual 1,7 source: 2
photographic 1,5 source: 2

spectral information:

spectral class B2 source: 96
Morgan-Keenan B2IV+B source: 25
B-magnitude 1,41 0,05 B-V-magnitude -0,22
U-magnitude 0,52 0,05 U-B-magnitude -0,89

variability information:

source of data: 30
variability type 10
var. amplitude 0,06
var. period 0,21
var. epoch 2440000
23. May 1968, 12:00:00 UT
next max light 2451622,03
18. March 2000, 12:43:12 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 41,7 arcsec
magnitude difference between brightest and second brightest component 13,3
position angle 109

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: 17h 30min 12,626sec DEC: -37 4' 9,63'' 0,009 arcsec
position (J2000) RA: 17h 33min 36,551sec DEC: -37 6' 13,61''
proper motion J1950 (FK4) RA: 0,0001 arcsec/a DEC: -0,029 arcsec/a 0,002 arcsec/a in RA
0,002 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0001 arcsec/a DEC: -0,028 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 1,7 (accuracy: 2 decimals)
source of visual magnitude data Taken from the "Henry Draper Catalogue".

spectral information:

spectral class B2
source of spectral data Taken from the Henry Draper Catalogue or no spectrum in source catalog.

catalogues

source catalogue FK4, catalogue number: 652
Durchmusterung CD-3711673
Boss General Catalogue 23769
Henry Draper Catalogue 158926

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

position and proper motion:

position (J2000) RA: 17h 33,6min DEC: -37 6'
proper motion (J2000) RA: -0,001 arcsec/a DEC: -0,029 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
AB 1897 1 109 41,7'' 1,6 14,9 B2IV+B SEE 334
AC 1897 1 331 94,9'' 1,6 12 - DUN 218

discoverer information:

discoverer code discoverer reference
SEE 334 See, T.J. -
DUN 218 Dunlop, J. -

notes:

note Lambda Sco. Variable. Spectroscopic binary.

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

position:

position (J1950) RA: 17h 30min 12,6sec DEC: -37 4' 10''

variability informations:

variability type BCEP+E: pulsating variable star
close binary eclipsing system
magnitute at max. brightness 1,62
magnitute amplitude 0,06
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2440000,1235
23. May 1968, 14:57:50 UT
period [d] 0,2136966
next maximum light [JD] 2451622,013091
18. March 2000, 12:18:51 UT

spectral information

spectral class B1.5IV

references

to a study Vol. III GCVS
to a chart/photograph no chart is avaible, but the star is contained in the 'Cordoba Durchmusterung'

miscanellous

ID in the GCVS catalogue 73/9011
constellation Scutum
notes on existence The star is equivalent to '07390121mu 1'.
There are notes in published catalog.

variability type description

variability type description
BCEP Variables of the Beta Cephei type (Beta Cep, Beta CMa), which are pulsating O8-B6 I-V stars with periods of light and radial-velocity variations in the range of 0.1 - 0.6 days and light amplitudes from 0.01 to 0.3 mag in V. The light curves are similar in shape to average radial-velocity curves but lag in phase by a quarter of the period, so that maximum brightness corresponds to
maximum contraction, i.e., to minimum stellar radius. The majority of these stars probably show radial pulsations, but some (V649 Per) display nonradial pulsations; multiperiodicity is characteristic of many of these stars.
E Eclipsing binary systems. These are binary systems with orbital planes so close to the observer's line of sight (the inclination i of the orbital plane to the plane orthogonal to the line of sight is close to 90 deg) that the components periodically eclipse each other.
Consequently, the observer finds changes of the apparent combined brightness of the system with the period coincident with that of the components' orbital motion.

EA
Algol (Beta Persei)-type eclipsing systems. Binaries with spherical or slightly ellipsoidal components. It is possible to specify, for their light curves, the moments of the beginning and end of the eclipses. Between eclipses the light remains almost constant or varies insignificantly because of reflection effects, slight ellipsoidality of components, or physical variations. Secondary minima may be absent. An extremely wide range of periods is observed, from 0.2 to >= 10000 days. Light amplitudes are also quite different and may reach several magnitudes.

EB
Beta Lyrae-type eclipsing systems. These are eclipsing systems having ellipsoidal components and light curves for which it is impossible to specify the exact times of onset and end of eclipses because of a continuous change of a system's apparent combined brightness between eclipses; secondary minimum is observed in all cases, its depth usually being considerably smaller than that of the primary minimum; periods are mainly longer than 1 day. The components
generally belong to early spectral types (B-A). Light amplitudes are usually <2 mag in V.

EW
W Ursae Majoris-type eclipsing variables. These are eclipsers with periods shorter than 1 days, consisting of ellipsoidal components almost in contact and having light curves for which it is impossible to specify the exact times of onset and end of eclipses. The depths of the primary and secondary minima are almost equal or differ insignificantly. Light amplitudes are usually <0.8 mag in V. The components generally belong to spectral types F-G and later.