Astronomy:7 Aquilae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 18h 51m 05.40849s[2] |
| Declination | −03° 15′ 40.0050″[2] |
| Apparent magnitude (V) | 6.894[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F0V[3] or F0IV[4] |
| B−V color index | +0.285[1] |
| Variable type | δ Sct[1] |
| Astrometry | |
| Radial velocity (Rv) | −20.65[2] km/s |
| Proper motion (μ) | RA: −46.266[2] mas/yr Dec.: −59.024[2] mas/yr |
| Parallax (π) | 9.0793 ± 0.0286[2] mas |
| Distance | 359 ± 1 ly (110.1 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.22[3] |
| Details | |
| Mass | 2.05[3][1] M☉ |
| Radius | 2.73[5] R☉ |
| Luminosity | 24[1] L☉ |
| Surface gravity (log g) | 3.62[3] cgs |
| Temperature | 7,257[3] K |
| Metallicity [Fe/H] | 0.01[3] dex |
| Rotational velocity (v sin i) | 32[1] km/s |
| Age | 1.17[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
7 Aquilae is a star in the equatorial constellation of Aquila,[6] located 359 light years away from the Sun. 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. The star is moving closer to the Earth with a heliocentric radial velocity of −21 km/s.
Houk and Swift (1999) find a stellar classification of F0IV,[4] 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.[3] This is a pulsating variable star of the Delta Scuti type.[3] It has double[3] the mass of the Sun and 2.7[5] 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 astronomical unit|AU away from the host star.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. doi:10.1086/520062. Bibcode: 2007AJ....134..860F.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 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. doi:10.1016/j.newast.2009.11.006. Bibcode: 2010NewA...15..397F.
- ↑ 4.0 4.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ 5.0 5.1 5.2 Cotten, Tara H.; Song, Inseok (July 2016). "A Comprehensive Census of Nearby Infrared Excess Stars". The Astrophysical Journal Supplement Series 225 (1): 24. doi:10.3847/0067-0049/225/1/15. 15. Bibcode: 2016ApJS..225...15C.
- ↑ 6.0 6.1 "7 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=7+Aql.
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