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7 Andromedae

From Wikipedia, the free encyclopedia
Star in the constellation Andromeda
For the galaxy, seeAndromeda VII.
7 Andromedae
Location of 7 Andromedae (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationAndromeda[1]
Right ascension23h 12m 33.004s[2]
Declination+49° 24′ 22.35″[2]
Apparent magnitude (V)4.52[3]
Characteristics
Spectral typeF1V[4]
U−Bcolor index+0.01[5]
B−Vcolor index+0.28[5]
Astrometry
Radial velocity (Rv)12.10±1[6] km/s
Proper motion (μ)RA: 89.939mas/yr[2]
Dec.: 95.704mas/yr[2]
Parallax (π)40.2940±0.1130 mas[2]
Distance80.9 ± 0.2 ly
(24.82 ± 0.07 pc)
Absolute magnitude (MV)2.58[1]
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
Age1,120±30 Myr
Other designations
Honores,7 And,BD+48°3964,FK5 3852,HD 219080,HIP 114570,HR 8830,SAO 52787,PPM 63927[8]
Database references
SIMBADdata

7 Andromedae, also namedHonores,[9] is a single,[10] yellow-white huedstar in the northernconstellation ofAndromeda.7 Andromedae is theFlamsteed designation, abbreviated7 And. It is visible to thenaked eye with anapparent visual magnitude of 4.52,[3] and is located 80.9 light years from Earth, based on an annualparallax shift of40.3 mas.[2] The star is moving further from the Sun with a heliocentricradial velocity of 12 km/s.[6]

This is an ordinaryF-type main-sequence star with astellar classification of F1V,[4] which indicates it is generating energy fromhydrogen fusion at its core. This energy is being radiated from itsphotosphere at the rate of 7.8 times theSun's luminosity with aneffective temperature of 7,380 K. The star has 1.6 times the mass of the Sun and 1.7 times the Sun's girth. 7 Andromedae is 1.1 billion years old and is spinning with aprojected rotational velocity of 61 km/s.[7]

Within Andromeda it is at the middle of a northerly chainasterism – 8, 11 are further south-westward, with 5, then3 Andromedae in the other direction. This star is the closest of these five, all of quite great apparent magnitude.

This star was part of the historical constellationHonores Friderici. TheIAU Working Group on Star Names approved the name Honores for 7 Andromedae, on 14 May 2025, after the obsolete constellation, and it is now so entered in the IAU Catalog of Star Names. This star was chosen for the name because it was in the feather part of the constellation, in reference to the proverb "the feather is mightier than the sword".[9]

References

[edit]
  1. ^abAnderson, 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.
  2. ^abcdeBrown, A. G. A.; et al. (Gaia collaboration) (2021)."Gaia Early Data Release 3: Summary of the contents and survey properties".Astronomy & Astrophysics.649: A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source atVizieR.
  3. ^abDucati, 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.
  4. ^abGray, 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.
  5. ^abMermilliod, J.-C. (1986)."Compilation of Eggen's UBV data, transformed to UBV (unpublished)".Catalogue of Eggen's UBV Data: 0.Bibcode:1986EgUBV........0M.
  6. ^abGontcharov, 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.
  7. ^abMaestro, 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. RetrievedSeptember 12, 2018.
  9. ^ab"IAU Catalog of Star Names". Retrieved14 May 2025.
  10. ^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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