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. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. 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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