24 Aquilae

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24 Aquilae
Observation data
Epoch J2000       Equinox J2000
Constellation Aquila
Right ascension 19h 18m 50.94777s [1]
Declination 00° 20′ 20.5448″ [1]
Apparent magnitude  (V)6.423 [2]
Characteristics
Spectral type K0-IIIa:CH1Ba0.5 [3]
U−B color index +0.770 [2]
B−V color index +1.050 [2]
Astrometry
Radial velocity (Rv)−26.13±0.15 [1]  km/s
Proper motion (μ)RA: +10.755 [1]   mas/yr
Dec.: +11.298 [1]   mas/yr
Parallax (π)7.5115 ± 0.0437  mas [1]
Distance 434 ± 3  ly
(133.1 ± 0.8  pc)
Absolute magnitude  (MV)+0.64 [4]
Details
Mass 2.2 [4]   M☉
Radius 11.17+0.32
−0.70 [1]   R☉
Luminosity 56.397±0.468 [1]   L☉
Surface gravity (log g)2.48 [5]   cgs
Temperature 4,733+155
−67 [1]   K
Metallicity [Fe/H]−0.19±0.06 [5]   dex
Age 0.5 [4]   Gyr
Other designations
BD+00 4170, HD  181053, HIP  94913, HR  7321, SAO  124492 [6]
Database references
SIMBAD data

24 Aquilae (abbreviated 24 Aql) is a star in the equatorial constellation of Aquila. 24 Aquilae is its Flamsteed designation. It is located at a distance of around 434 light-years (133 parsecs ) [1] from Earth and has an apparent visual magnitude of 6.4. [2] According to the Bortle Dark-Sky Scale, this star is just visible to the naked eye in dark rural skies. It is drifting closer to the Sun with a radial velocity of −26 km/s. [1]

This is a so-called mild barium star, as identified by the presence of a weak absorption line of singly-ionized barium atoms at a wavelength of 455.4 nm. Such stars display an atmospheric overabundance of carbon and the heavy elements produced by the s-process, which was most likely transferred into the atmosphere by a wide binary stellar companion. However, in the case of 24 Aquilae, the abundances of heavy elements are near normal. [4]

At an estimated age of a half billion years, [4] 24 Aquilae is a evolved giant star with a stellar classification of K0 IIIa. [4] It has more than double the mass of the Sun, 11 times the Sun's radius, and shines with 56 times the Sun's luminosity. [1] It is radiating this energy into space from its outer atmosphere at an effective temperature of 4,733 K. [1] This heat is what gives it the cool orange hue characteristic of a K-type star. [7]

Related Research Articles

Psi Ursae Majoris is a star in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.01, making it a third magnitude star and one of the brighter members of the constellation. Parallax measurements place it at a distance of 140 light-years from Earth. This is sufficiently close that the magnitude of the star is only reduced by 0.05 due to extinction. In Chinese astronomy, Psi Ursae Majoris is called Tien Tsan or Ta Tsun, "Extremely Honorable". The name was possibly derived from the word 太尊, Pinyin: Tàizūn, meaning Royals, because this star stands alone as the only member of the Royals asterism within the Purple Forbidden enclosure.

<span class="mw-page-title-main">Epsilon Aquilae</span> Binary star in the constellation of Aquila

Epsilon Aquilae, Latinized from ε Aquilae, is the Bayer designation for a binary star system in the equatorial constellation of Aquila, near the western constellation boundary with Hercules. It has an apparent visual magnitude of 4.02 and is visible to the naked eye. Based upon an annual parallax of 23.993 mas, Epsilon Aquilae lies at a distance of approximately 136 light-years from Earth, but is drifting closer with a radial velocity of –46 km/s.

<span class="mw-page-title-main">Tau Aquilae</span> Star in the constellation Aquila

Tau Aquilae, Latinized from τ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. The apparent visual magnitude of 5.7 indicates it is a faint star that is visible to the naked eye from suburban skies; at least according to the Bortle Dark-Sky Scale. The annual orbital motion of the Earth causes a parallax shift of 5.94 mas, which means the distance to this star is approximately 549 light-years. The magnitude of the star is diminished by 0.28 from extinction caused by interstellar gas and dust. It is drifting closer to the Sun with a radial velocity of −29 km/s.

70 Aquilae, abbreviated 70 Aql, is a single orange-hued star in the equatorial constellation of Aquila. 70 Aquilae is its Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.90. The distance to 70 Aquilae, as determined from its annual parallax shift of 3.5 mas, is around 940 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.

<span class="mw-page-title-main">26 Aquilae</span> Star in the constellation Aquila

26 Aquilae is a binary star system in the equatorial constellation of Aquila. 26 Aquilae is its Flamsteed designation though it also bears the Bayer designation f Aquilae. It has an apparent visual magnitude of 5.00, which means it is faintly visible to the naked eye. As the Earth orbits the Sun, this star system undergoes a parallax shift of 21.15 mas. This means it is located at a distance of approximately 154 light-years from Earth, give or take a three-light-year margin of error.

37 Aquilae, abbreviated 37 Aql, is a star in the equatorial constellation of Aquila. 37 Aquilae is its Flamsteed designation. It has an apparent visual magnitude of approximately 5.12, which is bright enough to be visible to the naked eye. The distance to 37 Aql can be estimated from its annual parallax shift of 7.4 mas, yielding a range of 444 light years. The star is moving closer to the Earth with a heliocentric radial velocity of −30 km/s, and is predicted to come to within 72 light-years in around 4.4 million years.

<span class="mw-page-title-main">21 Aquilae</span> Star in the constellation Aquila

21 Aquilae is a solitary variable star in the equatorial constellation of Aquila. It has the variable star designation V1288 Aql; 21 Aquilae is its Flamsteed designation. This object is visible to the naked eye as a dim, blue-white hued star with a baseline apparent visual magnitude of about 5.1. The star is located at a distance of around 680 light-years from Earth, give or take a 20 light-year margin of error. It is moving closer to the Earth with a heliocentric radial velocity of –5 km/s.

<span class="mw-page-title-main">19 Aquilae</span> Star in the constellation Aquila

19 Aquilae is a single star located 142 light-years away from the Sun in the equatorial constellation of Aquila. 19 Aquilae is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.23. The star is moving closer to the Earth with a heliocentric radial velocity of −46.7 km/s.

14 Aquilae is a probable spectroscopic binary star system in the equatorial constellation of Aquila. 14 Aquilae is the Flamsteed designation though it also bears the Bayer designation g Aquilae. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.42, and it is located at a distance of approximately 500 light-years from Sun. The star is moving closer to the Earth with a heliocentric radial velocity of −39 km/s, and may come as close as 136 light-years in around 3.5 million years.

58 Aquilae is a single star located around 520 light years from the Sun in the equatorial constellation of Aquila, near Eta Aquilae. 58 Aquilae is its Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.60. This object is moving closer to the Earth with a heliocentric radial velocity of −53 km/s, and may come as close as 161 light-years in around 1.8 million years.

64 Aquilae, abbreviated 64 Aql, is a star in the equatorial constellation of Aquila. 64 Aquilae is its Flamsteed designation. It is a faint star that requires good viewing conditions to see, having an apparent visual magnitude of 5.97. The distance to 64 Aql, as determined from its annual parallax shift of 21.42 mas, is 152.2 light years. At that distance, the visual magnitude of the star is diminished by an extinction of 0.029 due to interstellar dust. It is moving closer to the Earth with a heliocentric radial velocity of −3.6 km/s.

Omega Boötis, its name Latinized from ω Boötis, is a solitary, orange-hued star in the northern constellation of Boötes. It is a dim star but visible to the naked eye with an apparent visual magnitude of +4.82. Based upon an annual parallax shift of 8.75 mas as seen from the Earth, it is located about 373 light years from the Sun. The star is drifting further away with a radial velocity of +13 km/s.

<span class="mw-page-title-main">Epsilon Canis Minoris</span> Suspected binary star system in the constellation Canis Minor

Epsilon Canis Minoris is a suspected binary star system in the equatorial constellation of Canis Minor. It is a fifth magnitude star, which means it is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of just 3.13 mas as seen from Earth, this star is located roughly 770 light years from the Sun, give or take a 40 light year margin of error.

Iota Cephei is a star in the northern constellation Cepheus. Based upon an annual parallax shift of 28.29 mas as seen from the Earth, it is located about 115 light years from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 3.5.

<span class="mw-page-title-main">V Aquilae</span> Star in the constellation Aquila

V Aquilae is a carbon star and semiregular variable star in the constellation Aquila. It has an apparent magnitude which varies between 6.6 and 8.4 and is located around 400 parsecs (1,300 ly) away.

λ Lyrae, Latinized from Lambda Lyrae, is a suspected binary star system in the northern constellation of Lyra. It is an orange-hued point of light that is dimly visible to the naked eye with an apparent visual magnitude of 4.94. The system is located approximately 1,300 light years distant from the Sun based on parallax, but is drifting closer with a radial velocity of −17.7 km/s.

HD 167042 is a star with an orbiting exoplanet in the northern constellation of Draco. With an apparent visual magnitude of +5.97, the star is dimly visible to the naked eye. It is located at a distance of 162 light years based on parallax measurements, but it is drifting closer with a radial velocity of −18 km/s. HD 164595 has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.270″ yr−1.

46 Aquilae is a star in the constellation of Aquila, located to the north of Tarazed. 46 Aquilae is its Flamsteed designation. It is a dim, blue-white hued star that is a challenge to view with the naked eye, having an apparent visual magnitude of 6.33. This object is located approximately 830 light years from the Sun, based on parallax. It is moving closer to the Earth with a heliocentric radial velocity of −25 km/s.

7 Piscium is a single star in the zodiac constellation of Pisces, located around 343 light-years away from the Sun. It has the Bayer designation b Piscium; 7 Piscium is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.07. It is moving further from the Earth with a heliocentric radial velocity of 40 km/s.

37 Camelopardalis is a solitary star in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.36, allowing it to be seen with the naked eye under ideal conditions. Located about 444 light years away, the star is receding with a heliocentric radial velocity of 30.86 km/s.

References

  1. 1 2 3 4 5 6 7 8 9 10 11 12 13 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants", Monthly Notices of the Royal Astronomical Society , 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi: 10.1093/mnras/172.3.667 .
  3. ↑ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. 1 2 3 4 5 6 Smiljanic, R.; Porto de Mello, G. F.; da Silva, L. (June 2007), "Abundance analysis of barium and mild barium stars", Astronomy and Astrophysics, 468 (2): 679–693, arXiv: astro-ph/0702421 , Bibcode:2007A&A...468..679S, doi:10.1051/0004-6361:20065867, S2CID   5863942.
  5. 1 2 Soubiran, C.; Le Campion, J.-F.; Cayrel de Strobel, G.; Caillo, A. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv: 1004.1069 , Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID   118362423.
  6. ↑ "* 24 Aql". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-07-25.
  7. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
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