7 Arietis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.76[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B Template:Engvar | +1.04[4] |
| B−V Template:Engvar | +1.185[4] |
| Variable type | Eclipsing binary[5] (disputed)[6][7] |
| Astrometry | |
| Radial velocity (Rv) | +15.95[8] km/s |
| Proper motion (μ) | RA: +11.050[1] mas/yr Dec.: −9.513[1] mas/yr |
| Parallax (π) | 5.3941±0.1720 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| Radius | Script error: No such module "val".[1] Template:Solar radius |
| Luminosity | Script error: No such module "val".[1] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[1] K |
| Rotational velocity (v sin i) | Script error: No such module "val".[9] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[4] | |
| Database references | |
| SIMBAD | data |
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7 Arietis is a binary star[3] system in the northern constellation of Aries. 7 Arietis is the Flamsteed designation. The pair have a combined apparent visual magnitude of 5.76,[2] making it faintly visible to the naked eye from dark suburban skies. Based upon an annual parallax shift of 5.39 mas,[1] it is approximately Script error: No such module "convert". distant from the Earth, give or take a 30 light-year margin of error. It is drifting further away from the Sun with a radial velocity of +16 km/s.[8]
This is listed as an eclipsing binary system with a period of 47.9 days (although the star does not appear to be variable in the General Catalogue of Photometric Data, the Hipparcos data, and a study done in 1979-1980)[6][7] It has the variable star designation RR Arietis. During each eclipse of the primary star, the magnitude of the system decreases by 0.40. The eclipse of the secondary reduces the magnitude by 0.35.[5] The primary component of the system is an evolved giant star with a stellar classification of K1 III.[3] It is about 25 times the size of the Sun and is radiating 231 times the Sun's luminosity from its photosphere at an eeffective temperature of 4,500 K.[1]
The eclipsing binary nature of this star has been disputed by Italian astronomer Ennio Poretti.[10] Observations made as part of the British Astronomical Association eclipsing binaries program by Tristram Brelstaff were also unable to confirm eclipses.[11]
References
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