Sigma Cassiopeiae

{{Starbox begin

| name = σ Cassiopeiae

}}

{{Starbox image

| image=

{{Location mark

|image=Cassiopeia constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=σ Cassiopeiae

|x=620|y=624

}}

|caption=Location of σ Cassiopeiae (circled)

}}

{{Starbox observe 2s

| epoch = J2000.0

| constell = Cassiopeia

| component1 = σ Cas A

| ra1 = {{RA|23|59|00.538}}

| dec1 = {{DEC|+55|45|17.75}}

| appmag_v1 = 5.01

| component2 = σ Cas B

| ra2 = {{RA|23|59|00.331}}

| dec2 = {{DEC|+55|45|20.37}}

| appmag_v2 = 7.24

}}

{{Starbox character

| component1 = σ Cas A

| class = B2 IV

| b-v = −0.07

| u-b = −0.82

| variable = β Cep

| component2 = σ Cas B

| class2 = B3 V

| b-v2 =

| u-b2 =

| variable2 =

}}

{{Starbox astrometry

| component1 = σ Cas A

| radial_v = −12.6

| prop_mo_ra = +9.956

| prop_mo_dec = −4.492

| parallax = 2.7419

| p_error = 0.1491

| parallax_footnote =

| absmag_v = −3.90

| component12 = σ Cas B

| radial_v2 = −5.0

| prop_mo_ra2 = +8.651

| prop_mo_dec2 = −3.739

| parallax2 = 2.2572

| p_error2 = 0.0558

| parallax_footnote2 =

| absmag_v2 = −1.7

}}

{{Starbox detail

| source =

| component1 = A

| mass = 12

| temperature = 21,000

| radius = 11.3

| luminosity = 25,000

| gravity = 3.6

| rotational_velocity = 170

| age_myr = 15.8

}}

{{Starbox catalog

| names = 8 Cassiopeiae, HR 9071, HD 224572, BD+54°3082, HIP 118243, SAO 35947, ADS 17140, CCDM J23591+5546

}}

{{Starbox reference

| Simbad = Sigma+Cassiopeiae

}}

File:Sigma_Cassiopeiae.jpg

File:SigCasLightCurve.pngs for Sigma Cassiopeiae, plotted from ''TESS data.]]

Sigma Cassiopeiae (σ Cas, σ Cassiopeiae) is a binary star in the constellation Cassiopeia. It is 1,200 to {{val|fmt=commas|1,400|ul=light years}} from Earth and has a combined apparent magnitude of +4.88, making it visible to the naked eye.

The primary component, σ Cassiopeiae A, is a B2 subgiant with an apparent magnitude of +5.0. Its companion, σ Cassiopeiae B, is a B5 main sequence dwarf with an apparent magnitude of +7.1. The two stars are three arcseconds apart.

Naming

In Chinese, {{lang|zh|螣蛇}} ({{lang|zh-Latn|Téng Shé}}), meaning Flying Serpent, refers to an asterism consisting of σ Cassiopeiae, α Lacertae, 4 Lacertae, π² Cygni, π¹ Cygni, HD 206267, ε Cephei, β Lacertae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, the Chinese name for σ Cassiopeiae itself is {{lang|zh|螣蛇十一}} ({{lang|zh-Latn|Téng Shé shíyī}}, {{langx|en|the Eleventh Star of Flying Serpent}}).

References

{{Reflist|refs=

{{cite web

| title=MAST: Barbara A. Mikulski Archive for Space Telescopes

| url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html

| publisher=Space Telescope Science Institute | access-date=1 October 2024}}

{{cite journal |last1=Balona |first1=L. A. |last2=Ozuyar |first2=D. |title=Pulsation among TESS A and B stars and the Maia variables |journal=Monthly Notices of the Royal Astronomical Society |date=April 2020 |volume=493 |issue=4 |pages=5871–5879 |bibcode=2020MNRAS.493.5871B |doi=10.1093/mnras/staa670 |doi-access=free |arxiv=2001.04497 }}

{{cite journal | last1 = Kharchenko | first1 = N.V. | last2 = Scholz | first2 = R.-D. | last3 = Piskunov | first3 = A.E. | last4 = Röser | first4 = S. | last5 = Schilbach | first5 = E. | title = Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations | journal = Astronomische Nachrichten | date = November 2007 | volume = 328 | issue = 9 | pages = 889–896 | issn = 0004-6337 | eissn = 1521-3994 | doi = 10.1002/asna.200710776 | bibcode = 2007AN....328..889K | arxiv = 0705.0878| s2cid = 119323941 }}

{{cite journal|bibcode=2001AJ....122.3466M|title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog|journal=The Astronomical Journal|volume=122|issue=6|pages=3466|last1=Mason|first1=Brian D.|last2=Wycoff|first2=Gary L.|last3=Hartkopf|first3=William I.|last4=Douglass|first4=Geoffrey G.|last5=Worley|first5=Charles E.|year=2001|doi=10.1086/323920|doi-access=free}}

{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060707.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日] {{Webarchive|url=https://web.archive.org/web/20110521232711/http://aeea.nmns.edu.tw/2006/0607/ap060707.html |date=2011-05-21 }}

{{cite journal|bibcode=1983ApJ...272..182A|title=Confirmation among visual multiples of an increase of AP stars with age|journal=Astrophysical Journal|volume=272|pages=182|last1=Abt|first1=H. A.|last2=Cardona|first2=O.|year=1983|doi=10.1086/161276|doi-access=free}}

{{cite journal|doi=10.1016/j.newast.2009.05.001|title=Spectroscopic analysis of the candidate β Cephei star σ Cas: Atmospheric characterization and line-profile variability|journal=New Astronomy|volume=15|pages=39|year=2010|last1=Catanzaro|first1=G.|last2=Ventura|first2=R.|last3=Ferrara|first3=F.|last4=Paternò|first4=L.|issue=1|bibcode = 2010NewA...15...39C }}

{{cite journal|bibcode=2000A&A...355L..27H|title=The Tycho-2 catalogue of the 2.5 million brightest stars|journal=Astronomy and Astrophysics|volume=355|pages=L27|last1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|year=2000}}

{{cite journal|bibcode=1978A&AS...34....1N|title=Catalogue of homogeneous data in the UBV photoelectric photometric system|journal=Astronomy and Astrophysics|volume=34|pages=1|last1=Nicolet|first1=B.|year=1978}}

}}

Cassiopeiae, Sigma

Cassiopeiae, 08

Category:Binary stars

Category:B-type giants

Category:B-type main-sequence stars

Category:Cassiopeia (constellation)

9071

224572

118243

Category:Durchmusterung objects

Category:Beta Cephei variables

Category:Suspected variables