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8 Andromedae, abbreviated 8 And, is a probable triple star[11] system in the northern constellation of Andromeda. 8 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.82.[3] Based upon an annual parallax shift of 5.7 mas, it is located about 570 light years from the Earth. It is moving closer with a heliocentric radial velocity of −8 km/s.[6]

Not to be confused with Andromeda VIII.
8 Andromedae

A light curve for 8 Andromedae, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 17m 44.64727s[2]
Declination +49° 00′ 55.0829″[2]
Apparent magnitude (V) 4.82[3]
Characteristics
Spectral type M2.5 III Ba0.5[4]
B−V color index 1.673[5]
Astrometry
Radial velocity (Rv)−8.0±0.3[6] km/s
Proper motion (μ) RA: +33.779[2] mas/yr
Dec.: +6.213[2] mas/yr
Parallax (π)5.6963 ± 0.1030 mas[2]
Distance570 ± 10 ly
(176 ± 3 pc)
Absolute magnitude (MV)−1.727[5]
Details
Radius30[7] R☉
Surface gravity (log g)1.00±0.25[8] cgs
Temperature3,616±22[8] K
Metallicity [Fe/H]+0.04±0.08[8] dex
Rotational velocity (v sin i)5.0±1.0[9] km/s
Other designations
8 And, NSV 14484, BD+48° 3991, HD 219734, HIP 115022, HR 8860, SAO 52871, WDS J23177+4901A[10]
Database references
SIMBADdata

The primary component is an ageing red giant star with a stellar classification of M2.5 III Ba0.5.[4] The suffix notation indicates this is a mild barium star, which means the stellar atmosphere is enriched with s-process elements. It is either a member of a close binary system and has previously acquired these elements from a (now) white dwarf companion or else it is on the asymptotic giant branch and is generating the elements itself.[12] This is a periodic variable of unknown type, changing in brightness with an amplitude of 0.0161 magnitude at a frequency of 0.23354 d−1, or once every 4.3 days.[13]

The third component is the magnitude 13.0 star at an angular separation of 7.8″ along a position angle of 164°, as of 2015.[14] It has a Gaia Data Release 3 parallax of 5.7 mas and a proper motion almost identical to 8 Andromedae.[15] A number of other faint stars within a few arc-minutes of 8 Andromedae have been listed as companions, but none are at the same distance.[16]

Within Andromeda it is the second of a northerly chain asterism – 11 is further south-westward, with 7, 5, then 3 Andromedae in the other direction.


References


  1. "Light Curve", Hipparcos ESA, ESA, retrieved 4 October 2022.
  2. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  3. 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.
  4. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  5. Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
  6. 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.
  7. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  8. Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
  9. Zamanov, R. K.; et al. (October 2008), "Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics", Monthly Notices of the Royal Astronomical Society, 390 (1): 377–382, arXiv:0807.3817, Bibcode:2008MNRAS.390..377Z, doi:10.1111/j.1365-2966.2008.13751.x, S2CID 118697261.
  10. "8 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 14, 2018.
  11. 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.
  12. Gomez, A. E.; et al. (1997), "Absolute magnitudes and kinematics of barium stars", Astronomy and Astrophysics, 319: 881, Bibcode:1997A&A...319..881G.
  13. Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.
  14. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  15. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  16. Mason, Brian D.; et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920

На других языках

[de] 8 Andromedae

8 Andromedae (kurz 8 And) ist ein dem bloßen Auge lichtschwach erscheinendes, rötlich schimmerndes Sternsystem im Sternbild Andromeda. Es befindet sich im Norden der Andromeda an der Grenze zu den Sternbildern Eidechse und Kassiopeia. Seine scheinbare Helligkeit beträgt 4,85m.[2] Nach Parallaxen-Messungen der Raumsonde Gaia ist es etwa 573 Lichtjahre von der Erde entfernt.[1]
- [en] 8 Andromedae

[es] 8 Andromedae

8 Andromedae (8 And / HD 219734 / HR 8860)[1] es una estrella en la constelación de Andrómeda. De magnitud aparente +4,85, se encuentra a 655 años luz del Sistema Solar.

[ru] 8 Андромеды

8 Андромеды (лат. 8 Andromedae), HD 219734 — кратная звезда в созвездии Андромеды на расстоянии приблизительно 539 световых лет (около 165 парсеков) от Солнца. Видимая звёздная величина звезды — +4,82m[7].


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