Rasalgethi

Alpha Herculis (α Herculis, abbreviated Alpha Her, α Her), also designated 64 Herculis, is a multiple star system in the constellation of Hercules. Appearing as a single point of light to the naked eye, it is resolvable into a number of components through a telescope. It has a combined apparent magnitude of 3.08, although the brightest component is variable in brightness. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 360 light-years (110  parsecs) distant from the Sun.

System

Alpha Herculis is a triple star system. The primary (brightest) of the three stars, designated α¹ Herculis or α Herculis A, is a pulsating variable star on the asymptotic giant branch (AGB), and is the second nearest AGB star after Mira. The primary star forms a visual binary pair with a second star, which is itself a spectroscopic binary.

Alpha Herculis also forms the A and B components of a wider system designated WDS J17146+1423, with two additional faint visual companions designated WDS J17146+1423C and D. The two fainter stars are far more distant than the triple system.

Nomenclature

''α Herculis'' ( Latinised to ''Alpha Herculis'') is the system's Bayer designation; ''α¹'' and ''α² Herculis'', those of its two visible components. ''64 Herculis'' is the system's Flamsteed designation. WDS J17146+1423 is the wider system's designation in the Washington Double Star Catalog. The designations of Alpha Herculis' main components as ''Alpha Herculis A'' and ''B'' and the wider system's four components as WDS J17146+1423A, B, C and D, together with the spectroscopic pair - ''Alpha Herculis Ba'' and ''Bb'' - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).

Alpha Herculis bore the traditional name ''Rasalgethi'' or ''Ras Algethi'' ( ar, رأس الجاثي ra‘is al-jāthī 'Head of the Kneeler'). 'Head' comes from the fact that in antiquity Hercules was depicted upside down on maps of the constellation. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN approved the name ''Rasalgethi'' for the component Alpha Herculis A (α¹) on 30 June 2016 and it is now so included in the List of IAU-approved Star Names.

The term ''ra's al-jaθiyy'' or ''Ras al Djathi'' appeared in the catalogue of stars in the ''Calendarium'' of Al Achsasi al Mouakket, which was translated into Latin as ''Caput Ingeniculi''.

In Chinese astronomy, Alpha Herculis is called 帝座, Pinyin: Dìzuò, meaning 'Emperor's Seat'. The star is seen as marking itself, and stands alone in the center of the ''Emperor's Seat'' asterism, Heavenly Market enclosure (see: Chinese constellations). 帝座 (Dìzuò) was westernized into ''Ti Tso'' by R.H. Allen, with the same meaning Richard Hinckley Allen: Star Names — Their Lore and Meaning: Hercules
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Properties

Alpha Herculis A and B are more than 500 AU apart, with an estimated orbital period of approximately 3600 years. A presents as a relatively massive red bright giant, but radial velocity measurements suggest a companion with a period of the order of a decade. B's two components are a primary yellow giant star and a secondary, yellow-white dwarf star in a 51.578 day orbit.

Alpha Herculis A is an asymptotic giant branch (AGB) star, a luminous red giant that has both hydrogen and helium shells around a degenerate carbon-oxygen core. It is the second nearest AGB star to the Sun. The angular diameter of the star has been measured with an interferometer as
34 ± 0.8 mas, or 0.034 arcseconds. At its estimated distance of 110 parsecs this corresponds to a radius of about 280 million kilometers (or 170 million miles), which is roughly or 1.87 AU.To determine Rasalgethi's radius in terms of solar units, the calculations begin with the formula for angular diameter as follows:

:$\begin = \frac\end$

where ''δ'' equals Rasalgethi's angular diameter in arcseconds, ''d_R'' the star's diameter in AU, and ''D_R'' the Distance from Earth in parsecs. If one knows the angular diameter and the Distance, then one can solve for ''d_R'' as follows:

:$\begind_R = \delta \cdot D_R = \cdot 110.0 = 3.740 AU \end$.

To obtain Rasalgheti's radius:

:$\beginR_R = = = 1.870 AU \end$.
Converting into Solar units, 1 AU = 149,597,871 km and the mean radius of the Sun = 696,000 km, hence the calculation:

:$\begind_B = = 280,000,000 km = 402 R_ \end$ (rounded). If Alpha Herculis were at the center of the Solar System its radius would extend past the orbit of Mars at 1.5 AU but not quite as far as the asteroid belt. The red giant is estimated to have started its life with about .

Alpha Herculis A has been specified as a standard star for the spectral class M5 Ib-II. Like most type M stars near the end of their lives, Alpha Herculis is experiencing a high degree of stellar mass loss creating a sparse, gaseous envelope that extends at least 930 AU. It is a semiregular variable with complex changes in brightness with periods ranging from a few weeks to many years. The most noticeable variations occur at timescales of 80–140 days and at 1,000 - 3,000 days. The strongest detectable period is 128 days. The full range in brightness is from magnitude 2.7 to 4.0, but it usually varies over a much smaller range of around 0.6 magnitudes.

See also

*List of largest known stars
* Lists of stars in the constellation Hercules
* Betelgeuse mass loss
* Spectral types F, G & M

References

External links

*An Atlas of the Universe
Multiple Star Orbits
*Upside down Hercules showing Alpha Herculisethi as the head

{{DEFAULTSORT:Alpha Herculis
Double stars
Hercules (constellation)
Herculis, Alpha
Herculis, 064
Triple star systems
Rasalgethi
M-type bright giants
G-type giants
F-type main-sequence stars
6406 7
084345
156014 5
BD+14 3207
Semiregular variable stars
M-type supergiants
Asymptotic-giant-branch stars