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Rho Andromedae

Rho Andromedae
Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings
Location of ρ Andromedae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
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 mas/yr[1]
Dec.: –38.838 mas/yr[1]
Parallax (π)19.9513±0.0739 mas[1]
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. ^ a b c d e Brown, 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 at VizieR.
  2. ^ a b c d Breger, M. (March 1968), "UBV and narrow-band UVBY photometry of bright stars", Astronomical Journal, 73: 84–85, Bibcode:1968AJ.....73...84B, doi:10.1086/110602.
  3. ^ a b 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, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
  4. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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.
  5. ^ a b c 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, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959, S2CID 11027621.
  6. ^ a b c d e f g 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, Bibcode:2024A&A...682A.145S, doi:10.1051/0004-6361/202347136, ISSN 0004-6361
  7. ^ a b Balachandran, Suchitra (May 1, 1990), "Lithium depletion and rotation in main-sequence stars", Astrophysical Journal, Part 1, 354: 310–332, Bibcode:1990ApJ...354..310B, doi:10.1086/168691.
  8. ^ "* rho And -- Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-24.
  9. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, 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 Archived 2011-05-21 at the Wayback Machine

External links

Quelle: https://en.wikipedia.org/wiki/Rho_Andromedae
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