WDS 17146+1423 STF 2140 AD : NOTES
 
 
discov_num notes refcode
STF2140 alp Her = Rasalgethi. Star A is an irregular variable, and B is an
SB1, P = 51.58 d. Spectrum composite; G5III+F2V. Radial velocity
measures by Smith (1988 private comm.) for alp Her A since 1984
have shown an increase in velocity by about 11 km/sec during a
three-year interval, then an apparent turnover in velocity during
the fourth year. This suggests a component with a period of the
order of a decade; it now appears that this system may have at least
5 physical components. Measure of 1927.43 made by triangulation of
multiple measures.
The 1779.66 measure by Herschel was corrected. H__1804
Mk III Limb-darkened diameter 36.026 +/- 0.439 mas. MkT2003
CHR 139 Aa,Ab: A premature orbit has been computed.
See Baize & Petit (1989) catalog of doubles with variable component. Baz1989d
Radial velocity measures by Smith (1988 private communication) for alp
Her A since 1984 have shown an increase in velocity by about 11 km/sec
during a three-year interval, then an apparent turnover in velocity
during the fourth year. This suggests a component with a period of
the order of a decade; it now appears that this system may have at
least five physical components.
Aa,Ab: Resolved 3 times 1986-1991 at separations 0.16-0.19"
separations, but unresolved by Balega at the 6-m in 1997 and 10 times Bag1999a
1985-1997 at 4m and 2.5m telescopes Hrt2009
STF2140 AB: H 2 2. MEv2010
 
 
REFERENCES
 
 
refcode metd author reference
Bag1999a S j Balega, I.I., Balega, Y.Y., Maksimov, A.F., Pluzhnik, E.A., Shkhagosheva, Z.U., & 1999A&AS..140..287B
Bag1999a Vasyuk, V.A.
Bag1999a A&AS 140, 287, 1999
Baz1989d - Baize, P. & Petit, M. 1989A&AS...77..497B
Baz1989d A&AS 77, 497, 1989
H__1804 Mb - Herschel, W. 1804RSPT...94..353H
H__1804 Phil. Trans. R. Soc. 94, 353, 1804
Hrt2009 Su j Hartkopf, W.I. & Mason, B.D. 2009AJ....138..813H
Hrt2009 +orb AJ 138, 813, 2009
MEv2010 - MacEvoy, B. ...................
MEv2010 private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
MkT2003 Km - Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A., 2003AJ....126.2502M
MkT2003 +not Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MkT2003 AJ 126, 2502, 2003
 
 
DISCOVERER
 
 
idgroup discov author
1 AGC Clark, A.G.
2 CHR Center for High Ang. Res. Astronomy (speckle interferometry systems)
4 STF Struve, F.G.W.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
17146+1423 STF2140 AD 2002 12 39 79.2 3.48 11.10 M5Ib-II N D 171438.86+142324.9

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