Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pictor |
Right ascension | 06h 10m 17.908s [1] |
Declination | −54° 58′ 07.11″ [1] |
Apparent magnitude (V) | 4.72 [2] |
Characteristics | |
Evolutionary stage | Main sequence [3] |
Spectral type | B1/2(III)n [4] (B0.5:III?np + B0.5/3:) [5] |
U−B color index | −1.00 [6] |
B−V color index | −0.229±0.008 [2] |
Variable type | β Lyr [7] + β Cep [8] |
Astrometry | |
Radial velocity (Rv) | +30.6±2.8 [9] km/s |
Proper motion (μ) |
RA: −4.90
mas/
yr
[1] Dec.: +7.41 mas/ yr [1] |
Parallax (π) | 2.51 ± 0.15 mas [1] |
Distance | 1,300 ± 80
ly (400 ± 20 pc) |
Absolute magnitude (MV) | −3.27 [2] |
Orbit [10] | |
Period (P) | 1.67254 d |
Semi-major axis (a) | ≥ 3.83 Gm (0.0256 AU) |
Eccentricity (e) | 0.050±0.17 |
Periastron epoch (T) | 2,438,500.79±0.09 JD |
Argument of periastron (ω) (secondary) | 90±18° |
Semi-amplitude (K1) (primary) | 167.0±2.8 km/s |
Details | |
Primary | |
Mass | 16.3 [11] M☉ |
Radius | 7.62 [11] R☉ |
Luminosity | 20,900 [11] L☉ |
Temperature | 25,200 [11] K |
Rotational velocity (v sin i) | 170 [8] km/s |
Secondary | |
Mass | 8.6 [11] M☉ |
Radius | 5.05 [11] R☉ |
Luminosity | 4,790 [11] L☉ |
Temperature | 21,400 [11] K |
Other designations | |
Database references | |
SIMBAD | data |
Delta Pictoris, Latinized from δ Pictoris, is a binary star system in the southern constellation Pictor. It is visible to the naked with a combined apparent visual magnitude of 4.72. [2] The system is located at a distance of approximately 1,300 light years from the Sun based on parallax measurements, [1] and is drifting further away with a radial velocity of ~31 km/s. [9] It is a runaway star system that is generating a bow shock as it moves through the interstellar medium. [13]
The binary nature of this system was discovered by R. E. Wilson in 1914, [10] then it was found to be variable by A. W. J. Cousins in 1951. [15] A. D. A. Thackeray published orbital elements for the pair in 1966, showing they form an eclipsing double-lined spectroscopic binary with an orbital period of 1.67 days in essentially a circular orbit. [10] The low inclination of the orbital plane results in shallow eclipses. [3] The system is classified as a likely Beta Lyrae-type eclipsing binary with a peak magnitude of 4.65, which drops to 4.90 during the primary eclipse and 4.83 in the secondary eclipse. [7] It is probably a detached binary system with no circumstellar material being found. [3]
Both components of this system are massive main sequence stars [3] with a combined stellar classification of B1/2(III)n. [4] One member of the pair displays β Cep type pulsational behavior. [8] Mass estimates give a primary with 16.3 times the mass of the Sun and a secondary with about half that. [11]
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cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pictor |
Right ascension | 06h 10m 17.908s [1] |
Declination | −54° 58′ 07.11″ [1] |
Apparent magnitude (V) | 4.72 [2] |
Characteristics | |
Evolutionary stage | Main sequence [3] |
Spectral type | B1/2(III)n [4] (B0.5:III?np + B0.5/3:) [5] |
U−B color index | −1.00 [6] |
B−V color index | −0.229±0.008 [2] |
Variable type | β Lyr [7] + β Cep [8] |
Astrometry | |
Radial velocity (Rv) | +30.6±2.8 [9] km/s |
Proper motion (μ) |
RA: −4.90
mas/
yr
[1] Dec.: +7.41 mas/ yr [1] |
Parallax (π) | 2.51 ± 0.15 mas [1] |
Distance | 1,300 ± 80
ly (400 ± 20 pc) |
Absolute magnitude (MV) | −3.27 [2] |
Orbit [10] | |
Period (P) | 1.67254 d |
Semi-major axis (a) | ≥ 3.83 Gm (0.0256 AU) |
Eccentricity (e) | 0.050±0.17 |
Periastron epoch (T) | 2,438,500.79±0.09 JD |
Argument of periastron (ω) (secondary) | 90±18° |
Semi-amplitude (K1) (primary) | 167.0±2.8 km/s |
Details | |
Primary | |
Mass | 16.3 [11] M☉ |
Radius | 7.62 [11] R☉ |
Luminosity | 20,900 [11] L☉ |
Temperature | 25,200 [11] K |
Rotational velocity (v sin i) | 170 [8] km/s |
Secondary | |
Mass | 8.6 [11] M☉ |
Radius | 5.05 [11] R☉ |
Luminosity | 4,790 [11] L☉ |
Temperature | 21,400 [11] K |
Other designations | |
Database references | |
SIMBAD | data |
Delta Pictoris, Latinized from δ Pictoris, is a binary star system in the southern constellation Pictor. It is visible to the naked with a combined apparent visual magnitude of 4.72. [2] The system is located at a distance of approximately 1,300 light years from the Sun based on parallax measurements, [1] and is drifting further away with a radial velocity of ~31 km/s. [9] It is a runaway star system that is generating a bow shock as it moves through the interstellar medium. [13]
The binary nature of this system was discovered by R. E. Wilson in 1914, [10] then it was found to be variable by A. W. J. Cousins in 1951. [15] A. D. A. Thackeray published orbital elements for the pair in 1966, showing they form an eclipsing double-lined spectroscopic binary with an orbital period of 1.67 days in essentially a circular orbit. [10] The low inclination of the orbital plane results in shallow eclipses. [3] The system is classified as a likely Beta Lyrae-type eclipsing binary with a peak magnitude of 4.65, which drops to 4.90 during the primary eclipse and 4.83 in the secondary eclipse. [7] It is probably a detached binary system with no circumstellar material being found. [3]
Both components of this system are massive main sequence stars [3] with a combined stellar classification of B1/2(III)n. [4] One member of the pair displays β Cep type pulsational behavior. [8] Mass estimates give a primary with 16.3 times the mass of the Sun and a secondary with about half that. [11]
{{
cite web}}
: CS1 maint: postscript (
link)