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Beta Aquilae

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(Redirected from Alshain (star)) Triple star system in the constellation Aquila
Beta Aquilae
Location of β Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19 55 18.79256
Declination +06° 24′ 24.3425″
Apparent magnitude (V) 3.87 + 12.0
Characteristics
Spectral type G9.5 IV + M2.5 V
U−B color index 0.48
B−V color index 0.86
R−I color index 0.49
Variable type Suspected
Astrometry
Radial velocity (Rv)−40.3±0.09 km/s
Proper motion (μ) RA: 45.27 mas/yr
Dec.: −481.91 mas/yr
Parallax (π)73.00 ± 0.20 mas
Distance44.7 ± 0.1 ly
(13.70 ± 0.04 pc)
Absolute magnitude (MV)+3.03
Details
A
Mass1.36±0.13 M☉
Radius3.012±0.025 R☉
Luminosity5.575±0.068 L☉
Surface gravity (log g)3.614±0.044 cgs
Temperature5,113±20 K
Metallicity −0.20±0.04 dex
Rotation5.08697±0.00031 d
Rotational velocity (v sin i)22.28 km/s
Age9.6–11.4 Gyr
Other designations
Alshain, Alschairn, β Aql, 60 Aquilae, BD+06° 4357, FK5 749, GJ 771, HD 188512, HIP 98036, HR 7602, SAO 125235, WDS 19553+0624, LHS 5350a, LTT 15822
Database references
SIMBADdata
ARICNSdata

Beta Aquilae, Latinized from β Aquilae, is a triple star system in the equatorial constellation of Aquila. It is visible to the naked eye as a point-like source with an apparent visual magnitude of 3.87. Based on parallax measurements obtained during the Hipparcos mission, it is located at a distance of approximately 44.7 light-years from the Sun. It is drifting closer to the Sun with a radial velocity of −40 km/s.

Its two components are designated Beta Aquilae A (formally named Alshain /ælˈʃeɪn/, the traditional name for the system) and B.

Nomenclature

In this starfield showing many stars of Aquila constellation, the asterism α, β and γ Aquilae can be easily recognized on the left portion of the image.

β Aquilae (Latinised to Beta Aquilae) is the system's Bayer designation. The designations of the two components as Beta Aquilae A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).

The system bore the traditional name Alshain derived from the Perso-Arabic term الشاهين, aš-šāhīn, meaning "the (peregrine) falcon", perhaps by folk etymology from the Persian šāhīn tarāzū (or possibly šāhīn tara zed; see Gamma Aquilae), the Persian name for the asterism α, β and γ Aquilae. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name Alshain for the component Beta Aquilae A on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Unuk al Ghyrab (عنق ألغراب - únuq al-ghuraab), which was translated into Latin as Collum Corvi, meaning the crow's neck.

In Chinese, 河鼓 (Hé Gŭ), meaning River Drum, refers to an asterism consisting of Beta Aquilae, Altair and Gamma Aquilae. Consequently, the Chinese name for Beta Aquilae itself is 河鼓一 (Hé Gŭ yī, English: the First Star of River Drum).

Namesake

USS Alshain (AKA-55) was a United States navy ship.

Properties

The primary, component A, is of magnitude 3.71 and spectral class G8IV. It has a very low level of surface magnetic activity and may be in a state similar to a Maunder minimum. The activity shows a cycle of 969±27 d. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. This is an aging subgiant star that has exhausted the supply of hydrogen at its core and is evolving into a giant. Using interferometry at the CHARA Array, Alshain's radius was precisely determined at 3.012 times the radius of the Sun. It has a mass 36% greater than the Sun's, a luminosity 5.575 times that of the Sun, and an effective temperature of 5,113 K.

The 12th magnitude secondary companion, designated component B, is a double-lined spectroscopic binary which is 13 arcseconds away in the sky. It has a stellar classification of M2.5 V, matching a class M red dwarf.

In culture

In the Chinese folk tale The Cowherd and the Weaver Girl, Beta and Gamma Aquilae are children of Niulang (牛郎, The Cowherd, Altair) and Zhinü (織女, The Princess, Vega).

The Koori people of Victoria knew Beta and Gamma Aquilae as the black swan wives of Bunjil (Altair), the wedge-tailed eagle.

References

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