R Andromedae
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 24m 01.948s |
| Declination | +38° 34′ 37.35″ |
| Apparent magnitude (V) | 5.8 - 15.2 |
| Characteristics | |
| Spectral type | S3,5e-S8,8e(M7e) |
| 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 mas/yr Dec.: -32.64 ± 0.96 mas/yr |
| Distance | 532 ± 106pc |
| Details | |
| Radius | 485 ± 125 R☉ |
| Temperature | 2,000 – 3,500 K |
| Other designations | |
| 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, establishing that nucleosynthesis must be occurring in stars.
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