4 Andromedae
{{Short description|Star in the constellation Andromeda}}
{{distinguish|Andromeda IV}}
{{Starbox begin}}
{{Starbox image
| image=
{{Location mark
|image=Cassiopeia constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=4 Andromedae
|x=890|y=832
}}
|caption=Location of 4 Andromedae (circled)
}}
{{Starbox observe
| epoch = J2000
| constell = Andromeda
| ra = {{RA|23|07|39.2672}}{{cite DR3|1936166725851110656}}
| dec = {{DEC|+46|23|14.0302}}
}}
{{Starbox character
| type = Giant star
| u-b =
}}
{{Starbox astrometry
| radial_v = {{Val|−11.89|0.12}}
| prop_mo_ra = −12.734
| prop_mo_dec = −30.026
| parallax = 9.155
| p_error = 0.0779
| absmag_v =
}}
{{Starbox detail
| temperature = {{Val|4275|92|fmt=commas}}
| metal_fe = {{Val|1.98|0.11}}
| rotational_velocity =
| age_gyr = {{Val|2.24|0.78|0.58}}
}}
{{Starbox catalog
| names = {{odlist | F=4 And | BD=+45°4149 | FK5=3852 | HD=218452 | HIP=114200 | HR=8804 | SAO=52711 | PPM=63840 | WDS=J23077+4623A }}
}}
{{Starbox reference
| Simbad = 4+And
}}
{{Starbox end}}
4 Andromedae, abbreviated 4 And, is a single star in the northern constellation of Andromeda. 4 Andromedae is the Flamsteed designation. It is dimly visible to the naked eye with an apparent visual magnitude of 5.308. Based upon an annual parallax shift of {{Val|9.16|ul=mas}} as seen from Earth's orbit, it is located 356 light years away. At this distance, interstellar extinction diminishes the apparent magnitude of 4 And by 0.5326 magnitudes. The star is moving closer with a heliocentric radial velocity of −11 km/s. It has a magnitude 11.7 visual companion at an angular separation of {{Val|51.10|ul=arcsecond}} along a position angle of 348°, as of 2002.
At the age of 2.2 billion years, this is an aging giant star with a stellar classification of K5 III, having consumed the hydrogen at its core and evolved away from the main sequence. It has 1.6 times the mass of the Sun and has expanded to 23 times the Sun's radius. The star is radiating 170 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,275 K.
References
{{reflist|refs=
{{cite simbad | title=4 And | access-date=September 12, 2018 }}
| last1=Eggen | first1=O. J.
| title=Space-velocity vectors for 3483 stars with proper motion and radial velocity
| journal=Royal Observatory Bulletin
| volume=51 | year=1962
| page=79
| bibcode=1962RGOB...51...79E | postscript=. }}
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| display-authors=1 | title=The PASTEL catalogue: 2016 version
| journal=Astronomy & Astrophysics
| volume=591 | pages=A118 | year=2016
| arxiv=1605.07384 | doi=10.1051/0004-6361/201628497
| bibcode=2016A&A...591A.118S | s2cid=119258214 | postscript=. }}
| title=Determining Ages of APOGEE Giants with Known Distances
| journal=The Astrophysical Journal
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| volume=817 | pages=40 | year=2016
| issue=1
| bibcode=2016ApJ...817...40F | doi=10.3847/0004-637X/817/1/40
| arxiv=1511.04088 | s2cid=118675933
| postscript=. | doi-access=free
}}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=.
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}
| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
| last1=Gontcharov | first1=G. A.
| journal=Astronomy Letters | postscript=.
| volume=32 | issue=11 | pages=759–771 | date=2006
| bibcode=2006AstL...32..759G | arxiv=1606.08053
| doi=10.1134/S1063773706110065 | s2cid=119231169 }}
{{citation | display-authors=1
| title=The magnetic fields at the surface of active single G-K giants
| last1=Aurière | first1=M. | last2=Konstantinova-Antova | first2=R.
| last3=Charbonnel | first3=C. | last4=Wade | first4=G. A.
| last5=Tsvetkova | first5=S. | last6=Petit | first6=P.
| last7=Dintrans | first7=B. | last8=Drake | first8=N. A.
| last9=Decressin | first9=T. | last10=Lagarde | first10=N.
| last11=Donati | first11=J. F. | last12=Roudier | first12=T.
| last13=Lignières | first13=F. | last14=Schröder | first14=K. P.
| last15=Landstreet | first15=J. D. | last16=Lèbre | first16=A.
| last17=Weiss | first17=W. W. | last18=Zahn | first18=J. P.
| journal=Astronomy & Astrophysics | arxiv=1411.6230
| volume=574 | id=A90 | pages=30 | date=February 2015 | postscript=.
| doi=10.1051/0004-6361/201424579 | bibcode=2015A&A...574A..90A | s2cid=118504829
}}
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog
| journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | postscript=.
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds
| access-date=2015-07-22 | doi=10.1086/323920 | doi-access=free }}
}}
External links
- [http://aladin.u-strasbg.fr/AladinPreview?-c=*+++4+And&ident=*+++4+And&submit=Aladin+previewer Image 4 Andromedae]
{{Stars of Andromeda}}
{{DEFAULTSORT:4 Andromedae}}