RS Persei

Source: Wikipedia, the free encyclopedia.
RS Persei

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]
Distance
approx. 8,400 ly
(approx. 2,600 pc)
Absolute magnitude (MV)−6.18[5]
Details
Mass12-15[6] M☉
Radius491[7] - 547[8] R☉
Luminosity33,000 - 34,000[7] L☉
Surface gravity (log g)−0.2±0.05 cgs
Temperature3,535±170[7] K
AAVSO
 0215+56A
Database references
SIMBADdata

RS Persei is a

Perseus. The star's apparent magnitude varies from 7.82 to 10.0, meaning it is never visible to the naked eye
.

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[10]

RS Persei is classified as 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

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    S2CID 16299532
    .
  3. S2CID 40932414
    .
  4. Bibcode:1953GCRV..C......0W
    .
  5. ^
    S2CID 15109583
    .
  6. ^
    S2CID 17085548
    .
  7. ^
    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. doi:10.1051/0004-6361:200809664
    .
  10. ^ "OMC Archive". OMC Archive. The Astronomical Data Centre at CAB. Retrieved 19 December 2021.
  11. S2CID 5203133
    .
  12. S2CID 18383796
    .
  13. S2CID 73561291
    .

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=RS_Persei&oldid=1188048920"