Rasalgethi


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 Rasalgethi, a1Her, alf Her, 64 Her, HR 6406, HD 156014, SAO 102680, WDS 17146+1423A
other names Ras Algethi, Rasalegti
constellation Hercules

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

note (category: star names): RASALGETHI; Ras Algethi; Rasalegti.

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

position, motion, parallax:

position (J2000) RA: 17h 14min 38,9sec DEC: +14 23' 25''
position (J1900) RA: 17h 10min 5,2sec DEC: +14 30' 15''
proper motion (J2000) RA: -0,006 arcsec/a DEC: 0,036 arcsec/a
radial velocity -33 km/s
note: variable radial velocity
rotational velocity 21 km/s (uncertain) (variable)
trigonometric parallax -0,002 arcsec
note (category: dynamical parallaxes): 0.008".

magnitude

visual magnitude 3,48
(original HR magnitude)

spectral / color information

spectral class M5Ib-II
B-V-magnitude 1,44
U-B-magnitude 1,01
R-I-magnitude 2,14
note (category: spectra): Ultraviolet FeII emission. 5-micrometer observations indicate carbon monoxide.

variability information

variable star identification Alp Her
note (category: variability): ADS 10418A. Discovered by W. Herschel in 1795. SRc 3.0 - 4.0v. 6-yr. period superimposed by variations 50 - 155d. Surrounded by envelope of 2x10E+05 solar radii, expanding 10k/s, mass loss 3x10E-08 solar masses/y.

double/multiple star system information

number of components of multiple star system 4
separation 4,9 arcsec
mag difference (of double or brightest multiple) 2,2
component ID AB
note (category: double and multiple data): AB, 3600y, a = 4.68". Component B is HR 6407. Combined colors. Combined mag. 3.08V. Mass A, 14 solar. Other components faint, optical. Circumstellar lines around both A, B.

miscellaneous information

note (category: stellar radii or diameters): Diam. = 0.020 - 0.030".

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

position, motion, parallax:

position (J2000) RA: 17h 14min 38,882sec DEC: +14 23' 25,25'' 1,24 arcsec source: 29
proper motion (J2000) RA: -0,0004 arcsec/a DEC: 0,036 arcsec/a source: 25
radial velocity -33 km/s source: 25
galactic coord. (B1950) longitude: 35,54 latitude: 27,82
GCI unit vector (J2000) X: -0,190428 Y: -0,949722 Z: 0,248527

magnitude:

visual 2,7 (observed) source: 31
photovisual 3,5 source: 2
photographic 4,8 source: 2

spectral information:

spectral class Mb source: 29
Morgan-Keenan M5Ib-II source: 25
B-magnitude 4,92 0,05 B-V-magnitude 1,44
U-magnitude 5,93 0,05 U-B-magnitude 1,01

variability information:

source of data: 30
variability type 192
var. amplitude 1,3

double/multiple star system information:

source of data: 19
separation between brightest and second brightest component 21,1 arcsec
magnitude difference between brightest and second brightest component 12
position angle 330

component magnitude spectral class catalogue(s)/name(s)
A 2,7 Mb Rasalgethi, a1Herculis, 64 Her, HR 6406, HD 156014, SAO 102680
B 5,39 M0 a2Herculis, 64 Her, HR 6407, HD 156015, SAO 102681

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
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
29 SAOJ2000
SAO on FK5 at J2000, 1989
30 GCVS, 4th edition
Kholopov, P.N., et al., General Catalogue of Variable Stars, fourth edition, Moscow: Nauka Publishing House, 1985-88
31 CRM' (non-GCVS variable data)
Warren, W.H. Jr., Northern Hemisphere Catalog of Red Magnitudes, 1994

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

position and proper motion:

position (J1950) RA: 17h 12min 21,948sec DEC: +14 26' 45,34'' 0,006 arcsec
position (J2000) RA: 17h 14min 38,882sec DEC: +14 23' 25,25''
proper motion J1950 (FK4) RA: -0,0005 arcsec/a DEC: 0,034 arcsec/a 0,001 arcsec/a in RA
0,001 arcsec/a in DEC
proper motion J2000 (FK5) RA: -0,0004 arcsec/a DEC: 0,036 arcsec/a
source of proper motion data Determined by source catalog

magnitude:

visual 3,5 (accuracy: 2 decimals)
source of visual magnitude data Taken from Harvard or San Luis photometry.

spectral information:

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

remarks for duplicity and variability

Double star in Aitken's Double Star Catalogue (Aitken 1932)

catalogues

source catalogue GC, catalogue number: 23277
Durchmusterung BD+14 3207A
Boss General Catalogue 23277
Henry Draper Catalogue 156014

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

position and proper motion:

position (J2000) RA: 17h 14,6min DEC: +14 23'
proper motion (J2000) RA: -0,012 arcsec/a DEC: 0,037 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 1986 3 86 0,2'' 3,5 - M5Ib-II CHR 139
1991 231 -
Aa-B 1822 often 118 4,7'' 3,5 5,4 - STF2140
1993 106 4,8''
Aa-C 1888 6 336 23,5'' 3,5 15,5 M5Ib-II AGC 16
1934 330 21,1''
Aa-D 1878 - 39 85,4'' 3,5 11,1 M5Ib-II STF2140
1960 - 81,2''

discoverer information:

discoverer code discoverer reference
CHR 139 - -
STF2140 Struve, F.G.W. -
AGC 16 - -

notes:

note Alpha Her. A premature orbit has been computed. A is a semiregular variable. B is a spectroscopic binary, spectrum composite; G5III+F2V. Proper motion of B -006 +031.

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

position:

position (J1950) RA: 17h 12min 21,9sec DEC: +14 26' 45''

variability informations:

variability type SRC pulsating variable star
magnitute at max. brightness 2,74
magnitute at min. brightness 4
photometric system visual, photovisual or Johnson's V

spectral information

spectral class M5Ib-II

references

to a chart/photograph Vol. I GCVS (see Kholopov et al. 1985-1988)

miscanellous

ID in the GCVS catalogue 40/9001
constellation Hercules
notes on existence The star is equivalent to '0409003 gam'.
There are notes in published catalog.

variability type description

variability type description
SRC Semiregular variables, which are giants or supergiants of intermediate and late spectral types showing noticeable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to >2000 days, while the shapes of the light curves are rather different and variable, and the amplitudes may be from several hundredths to several magnitudes (usually 1-2 mag in V).

SRA
Semiregular late-type (M, C, S or Me, Ce, Se) giants displaying persistent periodicity and usually small (<2.5 mag in V) light amplitudes (Z Aqr). Amplitudes and light-curve shapes generally vary and periods are in the range of 35-1200 days. Many of these stars differ from Miras only by showing smaller light amplitudes;

SRB
Semiregular late-type (M, C, S or Me, Ce, Se) giants with poorly defined periodicity (mean cycles in the range of 20 to 2300 days) or with alternating intervals of periodic and slow irregular changes, and even with light constancy intervals (RR CrB, AF Cyg). Every star of this type may usually be assigned a certain mean period (cycle), which is the value given in the Catalogue. In a number of cases, the simultaneous presence of two or more periods of light variation is observed;

SRC
Semiregular late-type (M, C, S or Me, Ce, Se) supergiants (Mu Cep) with amplitudes of about 1 mag and periods of light variation from 30 days to several thousand days;

SRD
Semiregular variable giants and supergiants of F, G, or K spectral types, sometimes with emission lines in their spectra. Amplitudes of light variation are in the range from 0.1 to 4 mag, and the range of periods is from 30 to 1100 days (SX Her, SV UMa).