7 Aquilae

7 Aquilae is a star in the equatorial constellation of Aquila,[7] located 367 light years away from the Sun.[1] 7 Aquilae is the Flamsteed designation. It is visible to the naked eye as a faint, yellow-white hued star with a baseline apparent visual magnitude of 6.9.[2] The star is moving closer to the Earth with a heliocentric radial velocity of –29 km/s.[5]

7 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension  18h 51m 05.40889s[1]
Declination −03° 15′ 39.9996″[1]
Apparent magnitude (V) 6.894[2]
Characteristics
Spectral type F0V[2] or F0IV[3]
B−V color index +0.285[4]
Variable type δ Sct[4]
Astrometry
Radial velocity (Rv)–29[5] km/s
Proper motion (μ) RA: –46.657[1] mas/yr
Dec.: –59.355[1] mas/yr
Parallax (π)8.8856 ± 0.0504[1] mas
Distance367 ± 2 ly
(112.5 ± 0.6 pc)
Absolute magnitude (MV)1.22[2]
Details
Mass2.05[2][4] M☉
Radius2.730[6] R☉
Luminosity24[4] L☉
Surface gravity (log g)3.62[2] cgs
Temperature7,257[2] K
Metallicity [Fe/H]0.01[2] dex
Rotational velocity (v sin i)32[4] km/s
Other designations
7 Aql, BD–03°4390, HD 174532, HIP 92501, SAO 142696[7]
Database references
SIMBADdata

Houk and Swift (1999) find a stellar classification of F0IV,[3] matching an F-type subgiant star that has exhausted the hydrogen at its core and is evolving into a giant. Fox Machado et al. (2010) found a class of F0V, suggesting it is still a main sequence star.[2] This is a pulsating variable star of the Delta Scuti type.[2] It has double[2] the mass of the Sun and 2.7[6] times the Sun's radius. The detection of an infrared excess suggests a debris disk with a mean temperature of 140 K is orbiting about 16.30 AU away from the host star.[6]

References
  1. 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. Fox Machado, L.; Alvarez, M.; Michel, R.; Moya, A.; Peña, J. H.; Parrao, L.; Castro, A. (2010). "Strömgren photometry and spectroscopy of the δ Scuti stars 7 Aql and 8 Aql". New Astronomy. 15 (5): 397. arXiv:0912.2808. Bibcode:2010NewA...15..397F. doi:10.1016/j.newast.2009.11.006.
  3. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
  4. Fox Machado, L.; et al. (August 2007), "Multisite Observations of δ Scuti Stars 7 Aql and 8 Aql (a New δ Scuti Variable): The Twelfth STEPHI Campaign in 2003", The Astronomical Journal, 134 (2): 860–866, arXiv:0706.0576, Bibcode:2007AJ....134..860F, doi:10.1086/520062.
  5. Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Washington, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
  6. Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, 15.
  7. "7 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-24.
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