70 Aquarii

70 Aquarii is a variable star located 425[1] light years away from the Sun in the equatorial constellation of Aquarius. It has the variable star designation FM Aquarii;[6] 70 Aquarii is the Flamsteed designation. It is near the lower limit of visibility to the naked eye, appearing as a dim, yellow-white hued star with a baseline apparent visual magnitude of 6.19.[2] This star is moving closer to the Earth with a heliocentric radial velocity of –5.8 km/s.[5]

70 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 48m 30.21043s[1]
Declination –10° 33′ 19.7143″[1]
Apparent magnitude (V) 6.19[2]
Characteristics
Evolutionary stage main sequencec
Spectral type F0 V[3]
B−V color index +0.28[2]
Variable type δ Sct[4]
Astrometry
Radial velocity (Rv)–5.8[5] km/s
Proper motion (μ) RA: +31.535[1] mas/yr
Dec.: +7.915[1] mas/yr
Parallax (π)7.6654 ± 0.0704[1] mas
Distance425 ± 4 ly
(130 ± 1 pc)
Absolute magnitude (MV)+0.88[6]
Details
Radius4.17+0.17
−0.23[1] R☉
Luminosity44.8±0.5[1] L☉
Surface gravity (log g)3.48[6] cgs
Temperature7,314+187
−144[1] K
Metallicity [Fe/H]0.02±0.15[7] dex
Rotational velocity (v sin i)110[8] km/s
Other designations
70 Aqr, BD−11°5923, FK5 3825, HD 215874, HIP 112615, HR 8676, SAO 165308[9]
Database references
SIMBADdata

This is an F-type main-sequence star with a stellar classification of F0 V.[3] Located in the lower part of the instability strip, it is a Delta Scuti-type variable that ranges in brightness from magnitude 6.16 down to 6.19 with a period of 125 minutes (0.087 days).[4] The star has a high rate of spin, showing a projected rotational velocity of 110 km/s.[8] It has four[1] times the Sun's radius and is radiating 45[1] times the luminosity of the Sun from its photosphere at an effective temperature of around 7,314 K.[1]

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. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
  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. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  5. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  6. Paunzen, E.; et al. (September 2002), "On the Period-Luminosity-Colour-Metallicity relation and the pulsational characteristics of lambda Bootis type stars", Astronomy and Astrophysics, 392 (2): 515–528, arXiv:astro-ph/0207494, Bibcode:2002A&A...392..515P, doi:10.1051/0004-6361:20020854, S2CID 54666586
  7. Gáspár, András; et al. (2016), "The Correlation between Metallicity and Debris Disk Mass", The Astrophysical Journal, 826 (2): 171, arXiv:1604.07403, Bibcode:2016ApJ...826..171G, doi:10.3847/0004-637X/826/2/171, S2CID 119241004.
  8. Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763.
  9. "70 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-19.
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