R Cassiopeiae

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Star in the constellation Cassiopeia

title: "R Cassiopeiae" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["m-type-giants", "mira-variables", "emission-line-stars", "cassiopeia-(constellation)", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "bright-star-catalogue-objects", "objects-with-variable-star-designations", "asymptotic-giant-branch-stars"] description: "Star in the constellation Cassiopeia" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/R_Cassiopeiae" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Star in the constellation Cassiopeia ::

| image= |image=Cassiopeia constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=R Cassiopeiae |x=636|y=746 |caption=Location of R Cassiopeiae (circled) | epoch = J2000.0 | constell = Cassiopeia | ra = | dec = | appmag_v = 4.4 to 13.5 | class = M6e–M10e | b-v = +1.83 | u-b = +0.08 | variable = Mira | radial_v = | prop_mo_ra = 82.847 | prop_mo_dec = 17.485 | parallax = 5.7423 | p_error = 0.2011 | parallax_footnote = | dist_pc = | absmag_v = | mass = 0.59 | radius = 263 | luminosity = 8,960 | temperature = 2,812 | gravity = −0.50 | metal_fe = 0.50 | age_gyr = | names = | Simbad = R+Cas

::figure[src="https://upload.wikimedia.org/wikipedia/commons/1/13/RCasLightCurve.png" caption="Visual band]] [[light curve]] of R Cassiopeiae, from AAVSO data"] ::

R Cassiopeiae is a variable star in the northern constellation of Cassiopeia. It is located approximately 570 light years distant from the Sun, but is drifting closer with a radial velocity of −23 km/s. This is a pulsating Mira-type variable star with a brightness that varies from magnitude +4.4 down to +13.5 over a period of 433.6 days. At its maximum brightness, R Cassiopeiae is visible to the naked eye as a faint, red-hued star.

Norman Robert Pogson discovered the star, in 1853. This aging red giant star has a stellar classification that varies from M6e to M10e, where the 'e' suffix indicates emission features in the spectrum. Currently on the asymptotic giant branch, it has 59% of the mass of the Sun with an oxygen rich chemical abundance. Having exhausted the supply of hydrogen at its core, the star has expanded to 263 times the Sun's radius. On average, the star is radiating 3,837 times the luminosity of the Sun from its swollen photosphere with an effective temperature ranging around 2,812 K. It is losing mass at the rate of and is surrounded by a dusty circumstellar shell that extends out to .

References

| last1=Cannon | first1=Annie J. | title=Second catalogue of variable stars | journal=Annals of Harvard College Observatory | date=1907 | volume=55 | pages=1–94 |bibcode=1907AnHar..55....1C }}

| last1=Toone | first1=John | title=British variable star associations, 1848-1908 | journal=J. Br. Astron. Assoc. | date=2010 | volume=120 | issue=3 | pages=135–151 | url=https://britastro.org/vss/JBAA%20120-3%20135%20Toone.pdf | access-date=12 January 2025}}

| last1=Ducati | first1=J. R. | title=Catalogue of Stellar Photometry in Johnson's 11-color system | journal=CDS/ADC Collection of Electronic Catalogues | volume=2237 | pages=0 | year=2002 | bibcode=2002yCat.2237....0D }}

| title=The interface between the stellar wind and interstellar medium around R Cassiopeiae revealed by far-infrared imaging | last1=Ueta | first1=T. | last2=Stencel | first2=R. E. | last3=Yamamura | first3=I. | last4=Geise | first4=K. M. | last5=Karska | first5=A. | last6=Izumiura | first6=H. | last7=Nakada | first7=Y. | last8=Matsuura | first8=M. | last9=Ita | first9=Y. | last10=Tanabé | first10=T. | last11=Fukushi | first11=H. | last12=Matsunaga | first12=N. | last13=Mito | first13=H. | last14=Speck | first14=A. K. | display-authors=1 | journal=Astronomy and Astrophysics | volume=514 | id=A16 | pages=6 | date=May 2010 | arxiv=0911.4918 | bibcode=2010A&A...514A..16U | doi=10.1051/0004-6361/200913455 | s2cid=54745858 }}

| title=Multi-epoch Proper Motion Magnetic Field Comparison of SiO Masers around R Cas | last1=Assaf | first1=K. A. | journal=The Astrophysical Journal | volume=869 | issue=1 | id=80 | pages=19 | date=December 2018 | doi=10.3847/1538-4357/aaea65 | bibcode=2018ApJ...869...80A | doi-access=free }}

| display-authors=1 | last1=Samus | first1=N. N. | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | title=General Catalogue of Variable Stars | version=5.1 | journal=Astronomy Reports | year=2017 | volume=61 | issue=1 | pages=80–88 | bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 | s2cid=125853869 }}

| display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 | date=January 2005 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | doi=10.1051/0004-6361:20041272 | s2cid=17804304 }}

| last1=Takeuti|first1=Mine | last2=Nakagawa|first2=Akiharu | last3=Kurayama|first3=Tomoharu | last4=Honma|first4=Mareki | title=A Method to Estimate the Masses of Asymptotic Giant Branch Variable Stars | journal=Publications of the Astronomical Society of Japan | display-authors=1 | volume=65 | issue=3 | pages=60 | year=2013 | bibcode=2013PASJ...65...60T | doi=10.1093/pasj/65.3.60 | doi-access=free}}

References

  1. "Download Data". AAVSO.
  2. "R Cas".
  3. {{cite Gaia DR3. 1944073004732961152
  4. (2024). "Radial velocities from Gaia BP/RP spectra". Astronomy and Astrophysics.
  5. (2018). "Pulsation-triggered dust production by asymptotic giant branch stars". Monthly Notices of the Royal Astronomical Society.
  6. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::

m-type-giantsmira-variablesemission-line-starscassiopeia-(constellation)durchmusterung-objectshenry-draper-catalogue-objectshipparcos-objectsbright-star-catalogue-objectsobjects-with-variable-star-designationsasymptotic-giant-branch-stars