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Binary star in the constellation Aquarius From Wikipedia, the free encyclopedia
DV Aquarii is a binary star[10] system in the zodiac constellation of Aquarius, near the border with Capricornus. It has a peak apparent visual magnitude of 5.89,[3] which is bright enough to be visible to the naked eye. The distance can be estimated from its annual parallax shift of 11.2 mas,[2] yielding a separation of 291 light years.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 20h 58m 41.84009s[2] |
Declination | −14° 28′ 59.2527″[2] |
Apparent magnitude (V) | 5.89[3] |
Characteristics | |
Spectral type | A9 V[4] |
B−V color index | 0.244±0.009[5] |
Variable type | β Lyr[6] |
Astrometry | |
Radial velocity (Rv) | +10.3±7.4[7] km/s |
Proper motion (μ) | RA: −54.986[2] mas/yr Dec.: −18.428[2] mas/yr |
Parallax (π) | 11.2032 ± 0.1015 mas[2] |
Distance | 291 ± 3 ly (89.3 ± 0.8 pc) |
Absolute magnitude (MV) | 1.25[5] |
Orbit[8] | |
Period (P) | 1.5755 d |
Eccentricity (e) | 0 (adopted) |
Inclination (i) | 83.18±0.11[9]° |
Periastron epoch (T) | 2426160.50 JD |
Semi-amplitude (K1) (primary) | 95.5 km/s |
Details | |
DV Aqr Aa | |
Mass | 1.70[10] M☉ |
Radius | 2.756[9] R☉ |
Luminosity | 28.8+2.6 −2.4[11] L☉ |
Surface gravity (log g) | 3.97[11] cgs |
Temperature | 7,843±267[12] K |
Rotational velocity (v sin i) | 103[11] km/s |
Age | 679[12] Myr |
DV Aqr Ab | |
Mass | 1.01[10] M☉ |
Radius | 1.149[9] R☉ |
Surface gravity (log g) | 4.334[9] cgs |
Temperature | 6,056±240[9] K |
Other designations | |
Database references | |
SIMBAD | data |
This is a detached eclipsing binary system of the Beta Lyrae type. The orbital period for the system is 1.5755 days and the eccentricity is unknown and probably non-zero;[8] the orbital inclination is estimated to be 83.18°±0.11°.[9] During the primary eclipse the magnitude drops to 6.25. It descends to 6.10 with the secondary eclipse (with 6.10 being brighter than 6.25).[3] The pair have been identified as candidate Herbig Ae/Be stars,[14] and catalogued as A-type shell stars.[15]
A magnitude 10.8 star with the designation HD 358087[16] is a common proper motion companion. It is located at an angular separation of 129″ and has 78% of the Sun's mass. If it is gravitationally bound to the main system, the orbital period is estimated to be around 611,855 years[10]
This star was a part of the obsolete constellation Norma Nilotica.
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