R Crucis

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R Crucis

A visual band light curve for R Crucis, adapted from Dean et al. (1977)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Crux
Right ascension 12h 23m 37.68840s[2]
Declination −61° 37′ 44.8570″[2]
Apparent magnitude (V) 6.89[3]
Characteristics
Spectral type F6-G2Ib-II[4] or F7Ib/II[5]
B−V color index 0.67±0.02[3]
Variable type
δ Cep[6]
Distance
approx. 1,600 ly
(approx. 500 pc)
Details
dex
HIP 60455, SAO 251878[10]
Database references
SIMBADdata

R Crucis is a

light years from the Sun based on parallax,[7] but it is drifting closer with a radial velocity of −13.5 km/s.[3]

This is a Classical Cepheid, or

radius of the Sun (44.6 R☉), but the radius varies by 5 R☉ during each pulsation.[11] It has a near solar metallicity and the atmospheric abundances indicate it is likely past first dredge-up.[9]

A candidate companion star has been detected at an

projected separation of 6,330 AU. The Hubble WFC3 shows a closer companion at a separation of 1.9″.[12] The system is a source for X-ray emission but the contributing component is unclear.[13]

References

  1. Bibcode:1977MmRAS..83...69D
    . Retrieved 18 December 2021.
  2. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  3. ^
    S2CID 119257644
    .
  4. ^ a b Watson, Christopher (4 January 2010). "R Crucis". AAVSO Website. American Association of Variable Star Observers. Retrieved 12 March 2014.
  5. Bibcode:1978mcts.book.....H
    .
  6. ^
    S2CID 125853869
    .
  7. ^
    S2CID 18759600
    .
  8. Bibcode:2005AcA....55..247M
    .
  9. ^
    S2CID 122521758
    .
  10. ^ "R Cru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-14.
  11. Bibcode:2005AcA....55..247M
    .
  12. S2CID 119248298
    . 129.
  13. S2CID 118928066
    . 67.
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