Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 24m 01.946s[1] |
Declination | +38° 34′ 37.37″[1] |
Apparent magnitude (V) | 5.8 - 15.2[2] |
Characteristics | |
Spectral type | S3,5e-S8,8e(M7e)[2] |
B−V color index | 1.97[3] |
Variable type | Mira[2] |
Astrometry | |
Radial velocity (Rv) | −6.40 [4] km/s |
Proper motion (μ) | RA: −16.021±0.148[1] mas/yr Dec.: −32.794±0.141[1] mas/yr |
Parallax (π) | 2.6444 ± 0.1600 mas[1] |
Distance | 1,230 ± 70 ly (380 ± 20 pc) |
Absolute magnitude (MV) | −5.19[5] |
Details | |
Radius | 476±120 - 493±129[6] R☉ |
Luminosity | 6,300[7] L☉ |
Surface gravity (log g) | −1.02[8] cgs |
Temperature | 2,500[8] K |
Metallicity [Fe/H] | −1.01[9] dex |
Other designations | |
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 (ZrO) in its spectrum. It was among the stars found by Paul Merrill to show absorption lines of the unstable element technetium,[10] establishing that nucleosynthesis must be occurring in stars. The SH molecule was found for the first time outside earth in the atmosphere of this star.[11] The star is losing mass due to stellar winds at a rate of 1.09×10−6 M☉/yr.[5]
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