AR Cassiopeiae

{{short description|Star system in the constellation Cassiopeia}}

{{sky|23|30|0|+|58|33|0|620}}

{{starbox begin}}

{{Starbox image

| image = 250px

| caption = A light curve for AR Cassiopeiae, plotted from TESS data

}}

{{starbox observe 2s

| constell = CassiopeiaWikiSky, [http://server1.sky-map.org/starview?object_type=1&object_id=1657 "HD 221253"] (accessed 2010-10-27)

| epoch = J2000.0

| component1 = AB

| ra1 = {{RA|23|30|01.93946}}{{cite journal|title=Validation of the new Hipparcos reduction|author=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid=18759600}}

| dec1 = {{DEC|+58|32|56.1120}}

| appmag_v1 = 4.883 (4.912 / 8.814)

| component2 = CD

| ra2 = {{RA|23|29|52.2802}}{{cite journal|bibcode=2016A&A...595A...2G|doi=10.1051/0004-6361/201629512|arxiv=1609.04172|title=Gaia Data Release 1|journal=Astronomy & Astrophysics|volume=595|pages=A2|year=2016|author=Gaia Collaboration|s2cid=1828208}}

| dec2 = {{DEC|+58|32|54.458}}

| appmag_v2 = 7.09{{cite simbad|title=HD 221237|access-date=23 August 2017}}

}}

{{Starbox character

| component1 = AB

| class = B4 V + A6 V

| b-v = −0.12{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}}

| u-b = −0.62

| variable = Algol{{cite simbad|title=V* AR Cas|access-date=23 August 2017}}

| component2 = CD

| class2 = B9 V

| b-v2 = +0.01

| u-b2 = −0.14

}}

{{Starbox character | no_heading = y

| component1 = FG

| class = F7 IV + F9 V

}}

{{Starbox astrometry

| radial_v = {{val|-15.9|0.9}}{{cite journal|title=General catalogue of stellar radial velocities|journal=Washington|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}}

| prop_mo_ra = 17.90

| prop_mo_dec = 4.15

| parallax = 5.25

| p_error = 0.52

| parallax_footnote =

}}

{{Starbox astrometry | no_heading = y

| component1 = Aa

| absmag_v = {{val|−1.87|0.13}}

| absmag_bol = {{val|−3.56|0.13}}

| component2 = Ab

| absmag_v2 = {{val|2.20|0.11}}

| absmag_bol2 = {{val|2.18|0.11}}

}}

{{Starbox orbit

| reference = {{cite journal|bibcode=1999A&A...345..855H|title=Search for forced oscillations in binaries. III. Improved elements and the detection of line-profile variability of the B4V + A6V: system AR Cassiopeiae|journal=Astronomy and Astrophysics|volume=345|pages=855|last1=Holmgren|first1=D. E.|last2=Hadrava|first2=P.|last3=Harmanec|first3=P.|last4=Eenens|first4=P.|last5=Corral|first5=L. J.|last6=Yang|first6=S.|last7=Ak|first7=H.|last8=Bozić|first8=H.|year=1999}}

| primary = Aa

| name= Ab

| period_unitless = 6.0663170 d

| periastron = JD {{val|2436847.9404|0.0055}}

| periarg = {{val|41.82|0.47}}

| inclination = {{val|85.34|0.50}}

| eccentricity = 0.240

}}

{{Starbox detail

| source =

| component1 = Aa

| mass = {{val|5.90|0.20}}

| radius = {{val|5.05|0.06}}

| temperature = {{val|17200|500|fmt=commas}}

| gravity = {{val|3.80|0.02}}

| component2 = Ab

| mass2 = {{val|1.86|0.06}}

| radius2 = {{val|1.60|0.03}}

| temperature2 = {{val|8150|200|fmt=commas}}

| gravity2 = {{val|4.30|0.02}}

}}

{{Starbox catalog

| names = {{odlist|ADS=16795|CCDM=J23300+5833|WDS=J23300+5833}}

| component2 = AR Cassiopeiae (AB)

| names2 = {{odlist|name=1H. Cas|V=AR Cas|BD=+57°2748|HD=221253|HIP=115990|HR=8926|SAO=35478}}

| component3 = HD 221237 (CD)

| names3 = {{odlist|BD=+57°2747|HD=221237|SAO=35476}}

| component4 = FG

| names4 = UCAC4 743-089692

}}

{{Starbox reference

| Simbad = AR+Cas | sn=AR Cas (AB)

| Simbad2 = HD+221237 | sn2=CD

| Simbad3 = ADS+16795+D | sn3=D

| Simbad4 = CCDM+J23300%2B5833F | sn4=F

| Simbad5 = CCDM+J23300%2B5833G | sn5=G

}}

{{starbox end}}

AR Cassiopeiae (AR Cas) is a variable star in the constellation of Cassiopeia. It is thought to be a member of a septuple star system, one of only two known star systems with a multiplicity of 7, the other being Nu Scorpii.