RS Persei

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RS Persei
The Double Cluster.jpg
RS Persei is the red star closest to the centre of NGC 884, the right hand cluster (north is down).
Observation data
Epoch J2000       Equinox J2000
Constellation Perseus
Right ascension 2h 22m 24.296s [1]
Declination +57° 06′ 34.10″ [1]
Apparent magnitude  (V)7.82-10.0 [2]
Characteristics
Spectral type M4Iab [3]
Variable type SRc [2]
Astrometry
Radial velocity (Rv)−38.0±2 [4]  km/s
Proper motion (μ)RA: −0.602 [1]   mas/yr
Dec.: −1.107 [1]   mas/yr
Parallax (π)0.3874 ± 0.0450  mas [1]
Distance approx. 8,400  ly
(approx. 2,600  pc)
Absolute magnitude  (MV)−6.18 [5]
Details
Mass 12-15 [6]   M☉
Radius 491 [7] - 547 [8]   R☉
Luminosity 33,000 - 34,000 [7]   L☉
Surface gravity (log g)−0.2±0.05  cgs
Temperature 3,535±170 [7]   K
Other designations
RS  Per, HD  14488, BD+56°583, 2MASS  J02222428+5706340, AAVSO  0215+56A
Database references
SIMBAD data

RS Persei is a red supergiant variable star located in the Double Cluster in Perseus. The star's apparent magnitude varies from 7.82 to 10.0, meaning it is never visible to the naked eye.

Contents

Location

RS Persei is a member of the cluster NGC 884, χ Persei, one half of the famous Double Cluster. [9]

Variability

A light curve for RS Persei, plotted from INTEGRAL Optical Monitoring Camera data RSPerLightCurve.png
A light curve for RS Persei, plotted from INTEGRAL Optical Monitoring Camera data

RS Persei is classified as a semiregular variable star, with its brightness varying from magnitude 7.82 to 10.0 over 245 days, [2] Detailed studies show that it also pulsates with a long secondary period of 4,200±1,500 days. [11]

Properties

RS Persei is a large cool star with a temperature of 3,500 K. This makes it luminous, although much of its radiation is emitted in the infrared. In 2005, RS Per was calculated to have a bolometric luminosity of 145,000  L☉ and a radius around 1,000  R☉. [5] More recently, 2014 calculations across all wavelengths gives the star a lower luminosity of 77,600+9,500
−8,400 L☉ based on an assumed distance, and a radius of 770±30 R☉ based on the measured angular diameter and luminosity. [6]

Even more recent measurements based on its Gaia Data Release 2 parallax gives a luminosity below 40,000 L☉ with a corresponding radius of 491 R☉. [7] It is surrounded by dust that has condensed from material lost by the star. [12]

RS Persei has sometimes been considered to be a highly evolved low mass Asymptotic Giant Branch (AGB) star, [13] but calculations of its current mass suggest that it is a low mass supergiant. NGC 244 is also too young to host AGB stars. [6]

See also

Related Research Articles

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<span class="mw-page-title-main">KY Cygni</span> Star in the constellation Cygnus

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<span class="mw-page-title-main">Phi Cassiopeiae</span> Star in the constellation Cassiopeia

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KW Sagittarii is a red supergiant, located approximately 1,900 parsecs away from the Sun in the direction of the constellation Sagittarius. It is one of the largest-known stars. If placed at the center of the Solar System, the star's surface would engulf Mars.

<span class="mw-page-title-main">V354 Cephei</span> Star in the constellation Cepheus

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<span class="mw-page-title-main">MY Cephei</span> Star in the constellation Cepheus

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<span class="mw-page-title-main">RS Puppis</span> Variable star in the constellation Puppis

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<span class="mw-page-title-main">S Persei</span> Red supergiant or hypergiant variable star in the constellation Perseus

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<span class="mw-page-title-main">NO Aurigae</span> Star in the constellation Auriga

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<span class="mw-page-title-main">V602 Carinae</span> Star in the constellation Carina

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<span class="mw-page-title-main">Westerlund 1 W26</span> Star in the constellation Ara

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<span class="mw-page-title-main">BC Cygni</span> Star in the constellation Cygnus

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<span class="mw-page-title-main">BI Cygni</span> Star in the constellation Cygnus

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<span class="mw-page-title-main">XX Persei</span> Star in the constellation Perseus

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<span class="mw-page-title-main">BO Carinae</span> Star in the constellation Carina

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<span class="mw-page-title-main">NGC 7419</span> Open cluster in the constellation Cepheus

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<span class="mw-page-title-main">Westerlund 1-237</span> Possible red supergiant in the Westerlund 1 super star cluster

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References

  1. 1 2 3 4 5 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.
  2. 1 2 3 Samus', N. N.; Goranskii, V. P.; Durlevich, O. V.; Zharova, A. V.; Kazarovets, E. V.; Kireeva, N. N.; Pastukhova, E. N.; Williams, D. B.; Hazen, M. L. (2003). "An Electronic Version of the Second Volume of the General Catalogue of Variable Stars with Improved Coordinates". Astronomy Letters. 29 (7): 468. Bibcode:2003AstL...29..468S. doi:10.1134/1.1589864. S2CID   16299532.
  3. ↑ Saesen, S.; Carrier, F.; Pigulski, A.; Aerts, C.; Handler, G.; Narwid, A.; Fu, J. N.; Zhang, C.; Jiang, X. J.; Vanautgaerden, J.; Kopacki, G.; Stęślicki, M.; Acke, B.; Poretti, E.; Uytterhoeven, K.; Gielen, C.; Østensen, R.; De Meester, W.; Reed, M. D.; Kołaczkowski, Z.; Michalska, G.; Schmidt, E.; Yakut, K.; Leitner, A.; Kalomeni, B.; Cherix, M.; Spano, M.; Prins, S.; Van Helshoecht, V.; Zima, W.; Huygen, R.; Vandenbussche, B.; Lenz, P.; Ladjal, D.; Puga Antolín, E.; Verhoelst, T.; De Ridder, J.; Niarchos, P.; Liakos, A.; Lorenz, D.; Dehaes, S.; Reyniers, M.; Davignon, G.; Kim, S.-L.; Kim, D. H.; Lee, Y.-J.; Lee, C.-U.; Kwon, J.-H.; Broeders, E.; Van Winckel, H.; Vanhollebeke, E.; Waelkens, C.; Raskin, G.; Blom, Y.; Eggen, J. R.; Degroote, P.; Beck, P.; Puschnig, J.; Schmitzberger, L.; Gelven, G. A.; Steininger, B.; Blommaert, J.; Drummond, R.; Briquet, M.; Debosscher, J. (2010). "Photometric multi-site campaign on the open cluster NGC 884". Astronomy and Astrophysics. 515: A16. arXiv: 1001.1116 . Bibcode:2010A&A...515A..16S. doi:10.1051/0004-6361/200913236. ISSN   0004-6361. S2CID   40932414.
  4. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  5. 1 2 Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv: astro-ph/0504337 . Bibcode:2005ApJ...628..973L. doi:10.1086/430901. S2CID   15109583.
  6. 1 2 3 Baron, F.; Monnier, J. D.; Kiss, L. L.; Neilson, H. R.; Zhao, M.; Anderson, M.; Aarnio, A.; Pedretti, E.; Thureau, N.; Ten Brummelaar, T. A.; Ridgway, S. T.; McAlister, H. A.; Sturmann, J.; Sturmann, L.; Turner, N. (2014). "CHARA/MIRC Observations of Two M Supergiants in Perseus OB1: Temperature, Bayesian Modeling, and Compressed Sensing Imaging". The Astrophysical Journal. 785 (1): 46. arXiv: 1405.4032 . Bibcode:2014ApJ...785...46B. doi:10.1088/0004-637X/785/1/46. S2CID   17085548.
  7. 1 2 3 4 Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158 (1): 20. arXiv: 1905.03744 . Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID   148571616.
  8. ↑ Norris, Ryan P. (2019). Seeing Stars Like Never Before: A Long-term Interferometric Imaging Survey of Red Supergiants (PDF) (PhD). Georgia State University.
  9. ↑ Mermilliod, J. C.; Mayor, M.; Udry, S. (2008). "Red giants in open clusters. XIV. Mean radial velocities for 1309 stars and 166 open clusters". Astronomy and Astrophysics. 485 (1): 303–314. Bibcode:2008A&A...485..303M. doi: 10.1051/0004-6361:200809664 .
  10. ↑ "OMC Archive". OMC Archive. The Astronomical Data Centre at CAB. Retrieved 19 December 2021.
  11. ↑ Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721–1734. arXiv: astro-ph/0608438 . Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x. S2CID   5203133.
  12. ↑ Verhoelst, T.; Van Der Zypen, N.; Hony, S.; Decin, L.; Cami, J.; Eriksson, K. (2009). "The dust condensation sequence in red supergiant stars". Astronomy and Astrophysics. 498 (1): 127–138. arXiv: 0901.1262 . Bibcode:2009A&A...498..127V. doi:10.1051/0004-6361/20079063. S2CID   18383796.
  13. ↑ Yoon, Dong-Hwan; Cho, Se-Hyung; Kim, Jaeheon; Yun, Young joo; Park, Yong-Sun (2014). "SiO and H2O Maser Survey toward Post-asymptotic Giant Branch and Asymptotic Giant Branch Stars". The Astrophysical Journal Supplement. 211 (1): 15. Bibcode:2014ApJS..211...15Y. doi: 10.1088/0067-0049/211/1/15 . S2CID   73561291.
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