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) 7 - 15
Characteristics
Spectral type S6.5IIIeZr6Ti2
U−B color index 1.25
B−V color index 1.97
Variable type Mira
Astrometry
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[2] pc
Details
Radius 485 ± 125[2] R
Temperature 2,000 – 3,500 K
Other designations
HR 90, BD +37° 58, HD 1967, SAO 53860, HIP 1901.
Database references
SIMBAD data
Database references
SIMBAD data

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,[3] establishing that nucleosynthesis must be occurring in stars.

References[edit]

  1. ^ a b c d van Leeuwen, F. (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.  Vizier catalog entry
  2. ^ 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. 
  3. ^ Merrill, P. W. (1952). "Technetium in the stars". Science 115: 479–489 [484]. Bibcode:1952Sci...115..479.. doi:10.1126/science.115.2992.479.