7 Andromedae

7 Andromedae (abbreviated 7 And) is a single,[9] yellow-white hued star in the northern constellation of Andromeda. 7 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.52,[2] and is located 79.6 light years from Earth, based on an annual parallax shift of 41 mas.[1] The star is moving further from the Sun with a heliocentric radial velocity of 12 km/s.[5]

For the galaxy, see Andromeda VII.
7 Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 12m 33.00460s[1]
Declination +49° 24′ 22.3299″[1]
Apparent magnitude (V) 4.52[2]
Characteristics
Spectral type F1V[3]
U−B color index +0.01[4]
B−V color index +0.28[4]
Astrometry
Radial velocity (Rv)12.10±1[5] km/s
Proper motion (μ) RA: 89.292[1] mas/yr
Dec.: 96.696[1] mas/yr
Parallax (π)40.9812 ± 0.2307[1] mas
Distance79.6 ± 0.4 ly
(24.4 ± 0.1 pc)
Absolute magnitude (MV)2.58[6]
Details[7]
Mass1.6 ± 0.1 M☉
Radius1.71 ± 0.02 R☉
Luminosity7.8 ± 0.6 L☉
Surface gravity (log g)4.16 ± 0.02 cgs
Temperature7,380 ± 90 K
Metallicity [Fe/H]-0.02 ± 0.08 dex
Rotational velocity (v sin i)61 ± 6 km/s
Age1120 ± 30 Myr
Other designations
7 And, BD+48° 3964, FK5 3852, HD 219080, HIP 114570, HR 8830, SAO 52787[8]
Database references
SIMBADdata

This is an ordinary F-type main-sequence star with a stellar classification of F1V,[3] which indicates it is generating energy from hydrogen fusion at its core. This energy is being radiated from its photosphere at the rate of 7.8 times the Sun's luminosity with an effective temperature of 7,380 K. 7 Andromedae is 1.1 billion years old and is spinning with a projected rotational velocity of 61 km/s.

Within Andromeda it is at the middle of a northerly chain asterism – 8, 11 are further south-westward, with 5, then 3 Andromedae in the other direction. This star is the closest of these five, all of quite great apparent magnitude.

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.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. S2CID 119417105.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  6. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  7. Maestro, V.; Che, X.; Huber, D.; Ireland, M. J.; Monnier, J. D.; White, T. R.; Kok, Y.; Robertson, J. G.; Schaefer, G. H.; Brummelaar, T. A. T.; Tuthill, P. G. (2013). "Optical interferometry of early-type stars with PAVO@CHARA - I. Fundamental stellar properties". Monthly Notices of the Royal Astronomical Society. 434 (2): 1321. arXiv:1306.5937. Bibcode:2013MNRAS.434.1321M. doi:10.1093/mnras/stt1092. S2CID 2361434.
  8. "7 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 12, 2018.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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