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Rho Persei, Latinized from ρ Persei, is a star in the northern constellation of Perseus. It has the traditional name Gorgonea Tertia /ɡɔːrɡəˈniːə ˈtɜːrʃə/,[11] being the third member of the quartet called the Gorgonea in reference to the Gorgons from the legend of Perseus.[9] An apparent visual magnitude of +3.39[2] makes it visible to the naked eye, but a challenge to view from a well-lit urban environment. Based upon parallax measurements, it is located at a distance of roughly 308 light-years (94 pc) from Earth.[1]

A visual band light curve for Rho Persei, plotted from AAVSO data[12]
A visual band light curve for Rho Persei, plotted from AAVSO data[12]
ρ Persei
Location of ρ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 05m 10.59385s[1]
Declination +38° 50′ 24.9943″[1]
Apparent magnitude (V) +3.39[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M4 II[4]
U−B color index +1.79[2]
B−V color index +1.65[2]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)+29.10±0.30[5] km/s
Proper motion (μ) RA: +129.22[1] mas/yr
Dec.: –105.70[1] mas/yr
Parallax (π)10.60 ± 0.25 mas[1]
Distance308 ± 7 ly
(94 ± 2 pc)
Absolute magnitude (MV)−1.7[6]
Details[7]
Mass1.9±0.7 M☉
Radius143±12 R☉
Luminosity2,692+192
−180 L☉
Surface gravity (log g)0.37±0.15 cgs
Temperature3,479±125 K
Metallicity [Fe/H]−0.15 dex
Rotational velocity (v sin i)11.2[8] km/s
Age440[9] Myr
Other designations
Gorgonea Tertia, Rho Per, ρ Per, 25 Persei, BD+38°630, FK5 109, GC 3682, HD 19058, HIP 14354, HR 921, SAO 56138, PPM 68074[10]
Database references
SIMBADdata

Rho Persei is a semiregular variable star, whose apparent magnitude varies between 3.3 and 4.0[13] with periods of 50, 120 and 250 days.[6] The star has reached the asymptotic giant branch of its evolution.[3] It is a bright giant star with a stellar classification of M4 II.[4] The outer envelope has an effective temperature of 3,479 K,[7] giving it the red-orange hue of an M-type star.[14]

This star has a mass 1.9 times the mass of the Sun, while its radius has expanded to 143 times solar. It is radiating some 2,700 times the Sun's luminosity.[7] Rho Persei is losing mass at the rate of 1.2×10−8 solar masses per year, or the equivalent of the Sun's mass every 83 million years.[15] It is about 440 million years in age.[9]


Naming


In Chinese, 大陵 (Dà Líng), meaning Mausoleum, refers to an asterism consisting of ρ Persei, 9 Persei, τ Persei, ι Persei, κ Persei, β Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for ρ Persei itself is 大陵六 (Dà Líng liù, English: the Sixth Star of Mausoleum.).[16]


References


  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
  2. Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N
  3. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239
  4. Ragland, S.; et al. (November 2006), "First Surface-resolved Results with the Infrared Optical Telescope Array Imaging Interferometer: Detection of Asymmetries in Asymptotic Giant Branch Stars", The Astrophysical Journal, 652 (1): 650–660, arXiv:astro-ph/0607156, Bibcode:2006ApJ...652..650R, doi:10.1086/507453
  5. Famaey, B.; et al. (May 2009), "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698, S2CID 18739721
  6. Yeşilyaprak, C.; Aslan, Z. (December 2004), "Period-luminosity relation for M-type semiregular variables from Hipparcos parallaxes", Monthly Notices of the Royal Astronomical Society, 355 (2): 601–607, Bibcode:2004MNRAS.355..601Y, doi:10.1111/j.1365-2966.2004.08344.x
  7. Kallinger, T.; et al. (April 2019), "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation", Astronomy & Astrophysics, 624: 17, arXiv:1902.07531, Bibcode:2019A&A...624A..35K, doi:10.1051/0004-6361/201834514, A35.
  8. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209
  9. Kaler, James B., "GORGONEA TERTIA (Rho Persei)", Stars, University of Illinois, retrieved 2012-01-25
  10. "rho Per -- Semi-regular pulsating Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-24
  11. Allen, Richard Hinckley (1899), "Star-names and their meanings", New York, G. E. Stechert: 334, Bibcode:1899sntm.book.....A
  12. Enhanced LCG, AAVSO, retrieved 21 September 2022.
  13. Kukarkin, B. V.; et al. (1971), General Catalogue of Variable Stars (3rd ed.), Bibcode:1971GCVS3.C......0K
  14. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16
  15. Cox, Arthur N.; Becker, Stephen A.; Pesnell, W. Dean (2000), "Chapter 20. Theoretical Stellar Evolution" (PDF), Allen's astrophysical quantities (4th ed.), New York: Springer, p. 516, ISBN 0-387-98746-0, retrieved 2012-01-25 See table 20.5
  16. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日



На других языках

[de] Rho Persei

ρ Persei (Rho Persei, kurz ρ Per) ist ein knapp 100 Parsec entfernter halbregelmäßig veränderlicher Stern im Sternbild Perseus. Man findet ihn unmittelbar südlich des bekannten bedeckungsveränderlichen Sterns Algol. Seine scheinbare visuelle Helligkeit variiert zwischen etwas über 3 und rund 4 mag.
- [en] Rho Persei

[es] Gorgonea Tertia

Gorgonea Tertia (ρ Persei / ρ Per / 25 Persei)[1] es una estrella en la constelación de Perseo. Su nombre proviene de la mitología griega, refiriéndose a las gorgonas relacionadas con el héroe Perseo. Aunque las gorgonas solo eran tres, en la constelación se encuentran Gorgonea Prima —Algol (β Persei), que representa la cabeza de Medusa—, Gorgonea Secunda (π Persei) y Gorgonea Quarta (ω Persei), junto a Gorgonea Tertia. Las cuatro estrellas no tienen ninguna relación entre sí fuera del ámbito mitológico.

[ru] Ро Персея

Ро Персея (ρ Per, ρ Persei, Горгонеа Терция) — полуправильная переменная звезда в созвездии Персея. Имеет историческое название Горгонеа Терция от греческого Γοργόνιον — «третья Горгона»[2]. Входит в астеризм Голова Горгоны (или Голова Медузы). В древности, однако, этот астеризм иногда выделялся как самостоятельное созвездие[3].


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