R Andromedae

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R Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 24m 01.948s[1]
Declination +38° 34′ 37.35″[1]
Apparent magnitude (V) 5.8 - 15.2[2]
Spectral type S3,5e-S8,8e(M7e)[2]
U−B color index 1.25
B−V color index 1.97
Variable type Mira[2]
Radial velocity (Rv) -11.3 km/s
Proper motion (μ) RA: -14.98 ± 2.73[1] mas/yr
Dec.: -32.64 ± 0.96[1] mas/yr
Distance 532 ± 106[3] pc
Radius 485 ± 125[3] R
Temperature 2,000 – 3,500[citation needed] K
Other designations
HR 90, BD +37° 58, HD 1967, SAO 53860, HIP 1901.
Database references
Database references

R Andromedae (R And) is a Mira-type variable star in the constellation Andromeda. Its spectral class is type S because it shows absorption bands of zirconium monoxide in its spectrum. It was among the stars found by Paul Merrill to show absorption lines of the unstable element technetium,[4] establishing that nucleosynthesis must be occurring in stars.


  1. ^ a b c d van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  3. ^ a b van Belle, G. T.; et al. (1997). "Angular Size Measurements of Carbon Miras and S-Type Stars". The Astronomical Journal. 114 (5): 2150–2156. Bibcode:1997AJ....114.2150V. doi:10.1086/118635. 
  4. ^ Merrill, P. W. (1952). "Technetium in the stars". Science. 115: 479–489 [484]. Bibcode:1952Sci...115..479.. doi:10.1126/science.115.2992.479. 

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