Astronomy:Rho Andromedae

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Short description: Star in the constellation Andromeda
Rho Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings
12px
Location of ρ Andromedae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Andromeda
Right ascension  00h 21m 07.26896s[1]
Declination +37° 58′ 06.9727″[1]
Apparent magnitude (V) +5.19[2]
Characteristics
Spectral type F5IV-V[3]
U−B color index +0.039[2]
B−V color index +0.424[2]
Astrometry
Radial velocity (Rv)+10.4±0.6[4] km/s
Proper motion (μ) RA: +57.737[1] mas/yr
Dec.: –38.838[1] mas/yr
Parallax (π)19.9513 ± 0.0739[1] mas
Distance163.5 ± 0.6 ly
(50.1 ± 0.2 pc)
Absolute magnitude (MV)+1.73[5]
Details
Mass1.812±0.024[6] M☉
Radius3.234±0.034[6] R☉
Luminosity18.672±0.157[6] L☉
Surface gravity (log g)3.69±0.04[6] cgs
Temperature6,674±34[6] K
Metallicity [Fe/H]–0.09±0.03[6] dex
Rotational velocity (v sin i)44[7] km/s
Age1.3[5] Gyr
Other designations
ρ And, 27 Andromedae, BD+37 45, FK5 1009, HD 1671, HIP 1686, HR 82, SAO 53828, PPM 65222[8]
Database references
SIMBADdata

Rho Andromedae is a star in the northern constellation of Andromeda. Its Bayer designation is Latinized from ρ Andromedae, abbreviated Rho And or ρ And, respectively. The star has an apparent visual magnitude of +5.19,[2] which, according to the Bortle Dark-Sky Scale, is bright enough to be seen with the naked eye from dark suburban skies. Based upon parallax measurements, this star is at a distance of approximately 164 light-years (50 parsecs) from the Sun.[1] It is drifting further away with a radial velocity of +10 km/s.[4]

The stellar classification of this star is F5IV-V,[3] showing mixed spectral features of a main sequence and subgiant stage. It is about 1.3[5] billion years old and is spinning with a projected rotational velocity of 44 km/s.[7] The star has 1.8 times the mass of the Sun and 3.2 times the Sun's girth. The outer envelope is radiating around 18.7 times the luminosity of the Sun from its photosphere at an effective temperature of 6,674 K,[6] giving it the yellow-white hue of an F-type star.[9] X-ray emissions were detected from this star during the EXOSAT mission.[10]

Naming

In Chinese, 天廄 (Tiān Jiù), meaning Celestial Stable, refers to an asterism consisting of ρ Andromedae, θ Andromedae, σ Andromedae and seven fainter, unidentified stars. Consequently, the Chinese name for ρ Andromedae itself is 天廄二 (Tiān Jiù èr, English: the Second Star of Celestial Stable.)[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Breger, M. (March 1968), "UBV and narrow-band UVBY photometry of bright stars", Astronomical Journal 73: 84–85, doi:10.1086/110602, Bibcode: 1968AJ.....73...84B. 
  3. ↑ 3.0 3.1 Gray, R. O. et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal 121 (4): 2148–2158, doi:10.1086/319956, Bibcode: 2001AJ....121.2148G. 
  4. ↑ 4.0 4.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  5. ↑ 5.0 5.1 5.2 Nordström, B. et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics 418: 989–1019, doi:10.1051/0004-6361:20035959, Bibcode: 2004A&A...418..989N. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Soubiran, C. et al. (February 1, 2024), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics 682: A145, doi:10.1051/0004-6361/202347136, ISSN 0004-6361, Bibcode: 2024A&A...682A.145S 
  7. ↑ 7.0 7.1 Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1 354: 310–332, doi:10.1086/168691, Bibcode: 1990ApJ...354..310B. 
  8. ↑ "* rho And -- Star". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+rho+And+--+Star. 
  9. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16. 
  10. ↑ Gondoin, P.; Mangeney, A.; Praderie, F. (March 1987), "Solar-type giants - New X-ray detections from EXOSAT observations", Astronomy and Astrophysics 174 (1–2): 187–196, Bibcode: 1987A&A...174..187G. 
  11. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 18 日



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