Sheliak


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 Sheliak, b Lyr, bet Lyr, 10 Lyr, HR 7106, HD 174638, SAO 67451, FK5: 705, WDS 18501+3322A
other names Shelyak, Shiliak
constellation Lyra

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

note (category: star names): Sheliak; Shelyak; Shiliak.

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

position, motion, parallax:

position (J2000) RA: 18h 50min 4,8sec DEC: +33 21' 46''
position (J1900) RA: 18h 46min 23,2sec DEC: +33 14' 47''
proper motion (J2000) RA: 0,003 arcsec/a DEC: -0,003 arcsec/a
radial velocity -19 km/s
note: spectroscopic binaries
note: orbital data avaible
trigonometric parallax -0,002 arcsec

magnitude

visual magnitude 3,45
(V on UBV Johnson system)

spectral / color information

spectral class B8IIpe
B-V-magnitude 0
U-B-magnitude -0,56
R-I-magnitude 0,02
note (category: spectra): Shell star. Far UV COPERNICUS spectrum shows many emission lines, some with P Cygni profiles, presumably originating from a hotter source than the visual primary. Helium I line 10830 arises in outermost envelope which surrounds the Beta Lyrae system as a whole. Radio and X-ray source.
note (category: colors): Large infrared excess.

variability information

variable star identification Bet Lyr
note (category: variability): ADS 11745A, EB 3.25 - 4.36V, 12.913834d. Period varies. Presumed disk around secondary. Also radio flare activity. Prototype Beta Lyrae type, discovered by Goodricke in 1874.

double/multiple star system information

number of components of multiple star system 6
separation 45,7 arcsec
mag difference (of double or brightest multiple) 5,2
component ID AB
note (category: double and multiple data): AB fixed. B is 8.6v, B7v; may be collapsed star; vsini 120k/s. E, 9.9v A8pSr or B9V at 67" optical? F, 9.9v A8-9V or or B9V at 86". A, B, E and F are CPM.
note (category: spectroscopic binaries): ADS 11745A, 12.9349d, K 184.0k/s, V0 -17.8k/s, asini 32.7. Also 4.2y. Possible radio binary. ADS 11745B also SB, 4.34d, K 12.0k/s, V0 -29.4k/s, asini 0.695.

miscellaneous information

note (category: group membership): Member of the local association (Pleiades group).

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

position, motion, parallax:

position (J2000) RA: 18h 50min 4,8sec DEC: +33 21' 45,65'' 0,06 arcsec source: 15
proper motion (J2000) RA: 0,0003 arcsec/a DEC: -0,003 arcsec/a source: 25
radial velocity -19 km/s source: 25
galactic coord. (B1950) longitude: 63,19 latitude: 14,78
GCI unit vector (J2000) X: 0,181056 Y: -0,815345 Z: 0,549937

magnitude:

visual 3,45 (observed) source: 25

spectral information:

spectral class +++ source: 29
Morgan-Keenan B8IIpe source: 25
B-magnitude 3,45 0,05 B-V-magnitude 0
U-magnitude 2,89 0,05 U-B-magnitude -0,56

variability information:

source of data: 27
variability type 320
var. amplitude 1,2
var. period 12,91
var. epoch 2408247,95
16. June 1881, 10:48:00 UT
next max light 2451625,55
22. March 2000, 01:12:00 UT

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 45,7 arcsec
magnitude difference between brightest and second brightest component 5,2
position angle 149

component magnitude spectral class catalogue(s)/name(s)
A 3,45 +++ Sheliak, b Lyrae, 10 Lyr, HR 7106, HD 174638, SAO 67451
B 7,22 B3

sources:

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
27 Catalog of Red Magnitudes (CRM)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994
29 SAOJ2000
SAO on FK5 at J2000, 1989

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

position and proper motion:

position (J1950) RA: 18h 48min 13,935sec DEC: +33 18' 12,51'' 0,004 arcsec
position (J2000) RA: 18h 50min 4,8sec DEC: +33 21' 45,75''
proper motion J1950 (FK4) RA: 0 arcsec/a DEC: -0,002 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: 0,0003 arcsec/a DEC: -0,002 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,9 (accuracy: 2 decimals)
source of visual magnitude data Arithmetic mean of maximum and minimum magnitudes of a variable star

spectral information:

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

remarks for duplicity and variability

Variable star in visual magnitude in source catalog

catalogues

source catalogue FK4, catalogue number: 705
Durchmusterung BD+33 3223
Boss General Catalogue 25847
Henry Draper Catalogue 174638

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

position and proper motion:

position (J2000) RA: 18h 50,1min DEC: +33 22'
proper motion (J2000) RA: 0,003 arcsec/a DEC: -0,003 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 1835 33 149 45,7'' 3,4 8,6 B7Ve+A8p STF 39
AC 1878 3 248 46,6'' - 13 - BU 293
AD 1898 1 68 64,3'' - 14,3 - BU 293
AE 1879 11 318 66,9'' 3,4 9,9 - BU 293
AF 1879 11 19 85,8'' 3,4 9,9 - BU 293
1959 - 86''

discoverer information:

discoverer code discoverer reference
STF 39 Struve, F.G.W. -
BU 293 Burnham, S.W. -

notes:

note Beta Lyrae. A is the prototype variable of its class. B is BD+33@3224. Proper motion of B -014 -013.

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

position:

position (J1950) RA: 18h 48min 13,9sec DEC: +33 18' 13''

variability informations:

variability type EB close binary eclipsing system
magnitute at max. brightness 3,25
magnitute at min. brightness 4,36
photometric system visual, photovisual or Johnson's V
epoch for maximum light [JD] 2408247,95
16. June 1881, 10:48:00 UT
period [d] 12,913834
next maximum light [JD] 2451625,518406
22. March 2000, 00:26:30 UT

spectral information

spectral class B8II-IIIep

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 52/9002
constellation Lyra
notes on existence The star is equivalent to '05290042del 2'.
There are notes in published catalog.

variability type description

variability type description
EB 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.