R Cassiopeiae
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cassiopeia[2] |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 4.4 to 13.5[4] |
| Characteristics | |
| Spectral type | M6e–M10e[4] |
| U−B Template:Engvar | +0.08[5] |
| B−V Template:Engvar | +1.83[5] |
| Variable type | Mira[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[6] km/s |
| Proper motion (μ) | RA: 82.847[3] mas/yr Dec.: 17.485[3] mas/yr |
| Parallax (π) | 5.7423±0.2011 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| Mass | 0.59[7] Template:Solar mass |
| Radius | 263[7] Template:Solar radius |
| Luminosity | 8,960[8] Template:Solar luminosity |
| Surface gravity (log g) | −0.50[9] cgs |
| Temperature | 2,812[7] K |
| Metallicity [Fe/H] | 0.50[9] dex |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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R Cassiopeiae is a variable star in the northern constellation of Cassiopeia. It is located approximately 570 light years distant from the Sun, but is drifting closer with a radial velocity of −23 km/s.[6] This is a pulsating Mira-type variable star with a brightness that varies from magnitude +4.4 down to +13.5 over a period of 433.6 days.[4] At its maximum brightness, R Cassiopeiae is visible to the naked eye as a faint, red-hued star.
Norman Robert Pogson discovered the star, in 1853.[11][12] This aging red giant star has a stellar classification that varies from M6e to M10e,[4] where the 'e' suffix indicates emission features in the spectrum. Currently on the asymptotic giant branch,[13] it has 59%[7] of the mass of the Sun with an oxygen rich chemical abundance.[14] Having exhausted the supply of hydrogen at its core, the star has expanded to 263[7] times the Sun's radius. On average, the star is radiating 3,837[7] times the luminosity of the Sun from its swollen photosphere with an effective temperature ranging around 2,812 K.[7] It is losing mass at the rate of Script error: No such module "val".[8] and is surrounded by a dusty circumstellar shell that extends out to Script error: No such module "val"..[14]
See also
References
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