7 Aquilae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[2] |
| 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 AU away from the host star.[5]
References[edit]
- ^ a b c d e f 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. S2CID 15349358.
- ^ a b c d e f g h Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g h i j 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. S2CID 119241648.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ a b c 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. S2CID 118438871. 15.
- ^ a b "7 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-24.
